Featured publications:
Measurement of the muon flux from 400 GeV/c protons interacting in a thick molybdenum/tungsten target
The SHiP experiment is proposed to search for very weakly interacting particles beyond the Standard Model which are produced in a 400 GeV/c proton beam dump at the CERN SPS. About 1011 muons per spill will be produced in the dump. To design the experiment such that the muon-induced background is minimized, a precise knowledge of the muon spectrum is required. To validate the muon flux generated by our Pythia and GEANT4 based Monte Carlo simulation (FairShip), we have measured the muon flux emanating from a SHiP-like target at the SPS. This target, consisting of 13 interaction lengths of slabs of molybdenum and tungsten, followed by a 2.4 m iron hadron absorber was placed in the H4 400 GeV/c proton beam line. To identify muons and to measure the momentum spectrum, a spectrometer instrumented with drift tubes and a muon tagger were used. During a 3-week period a dataset for analysis corresponding to (3.27±0.07) × 1011 protons on target was recorded. This amounts to approximatively 1% of a SHiP spill.
https://doi.org/10.1140/epjc/s10052-020-7788-y
The SHiP experiment is proposed to search for very weakly interacting particles beyond the Standard Model which are produced in a 400 GeV/c proton beam dump at the CERN SPS. About 1011 muons per spill will be produced in the dump. To design the experiment such that the muon-induced background is minimized, a precise knowledge of the muon spectrum is required. To validate the muon flux generated by our Pythia and GEANT4 based Monte Carlo simulation (FairShip), we have measured the muon flux emanating from a SHiP-like target at the SPS. This target, consisting of 13 interaction lengths of slabs of molybdenum and tungsten, followed by a 2.4 m iron hadron absorber was placed in the H4 400 GeV/c proton beam line. To identify muons and to measure the momentum spectrum, a spectrometer instrumented with drift tubes and a muon tagger were used. During a 3-week period a dataset for analysis corresponding to (3.27±0.07) × 1011 protons on target was recorded. This amounts to approximatively 1% of a SHiP spill.
https://doi.org/10.1140/epjc/s10052-020-7788-y
The European Physical Journal C
D. Karpenkov, et al., Eur. Phys. J. C 80 (2020) 284.
Direct synthesis of p-type bulk BiCuSeO oxyselenides by reactive spark plasma sintering and related thermoelectric properties
Herein, we demonstrate that BiCuSeO compound can be formed in bulk directly from the raw materials through reactive spark plasma sintering (RSPS) followed by ball milling and a second short spark plasma sintering step. Compared to BiCuSeO samples obtained by a conventional solid-state reaction, the electrical transport properties of the RSPS bulk were moderately affected by the sintering technique, while the lattice thermal conductivity was almost unaffected, and the figure of merit zT attained a value at 773 K comparable to state-of-the-art BiCuSeO. The results indicate a new scalable method for the preparation of oxyselenides.
https://doi.org/10.1016/j.scriptamat.2020.06.043
Herein, we demonstrate that BiCuSeO compound can be formed in bulk directly from the raw materials through reactive spark plasma sintering (RSPS) followed by ball milling and a second short spark plasma sintering step. Compared to BiCuSeO samples obtained by a conventional solid-state reaction, the electrical transport properties of the RSPS bulk were moderately affected by the sintering technique, while the lattice thermal conductivity was almost unaffected, and the figure of merit zT attained a value at 773 K comparable to state-of-the-art BiCuSeO. The results indicate a new scalable method for the preparation of oxyselenides.
https://doi.org/10.1016/j.scriptamat.2020.06.043
Scripta Materialia
A. Novitskii, G. Guélou, A. Voronin, T. Mori, V. Khovaylo, Scr. Mater. 187 (2020) 317–322.
Pressure Dependence of Magnetic Properties in La(Fe,Si)13: Multistimulus Responsiveness of Caloric Effects by Modeling and Experiment
For a better understanding of multistimuli-responsive caloric materials with a first-order transition and for optimization of their functional properties, it is necessary to predict the behavior of the material under changes of both magnetic field and pressure. Here, we design and build a special device that can provide a self-consistent set of parameters needed for the comprehensive characterization of multistimuli-responsive functional magnetic materials. Using this scientific instrument, a data set of simultaneously measured magnetization, M(T)H, and volume magnetostriction, ω(T)H, values are obtained for LaFe11.4Si1.6 with a first-order transition. Furthermore, based on simultaneously measured M(T) and ω(T) dependencies obtained at ambient pressure, we develop an approach that allows the behavior of magnetization under different pressures, M(T)P, to be described analytically. Additional parameters, such as compressibility, κ(T); thermal expansion coefficient, α(T); and magnetoelastic interaction or effective magnetovolume coupling constant, CMV, are determined. For verification of our developed model, direct measurements of magnetization under external pressure (up to P = 1 GPa) are carried out on the same sample as that used for simultaneous measurement of magnetization and magnetovolume effect. A comparison of simulated M(T)P dependencies with experimental M(T)P confirms that our approach provides a more realistic behavior of transition temperature under pressure, TC(P), than that of the TC(P) predicted by the Bean-Rodbell model; thus, this approach is more suitable for predicting the behavior of multistimuli-responsive caloric materials with first-order transitions under changes of both magnetic field and pressure.
https://doi.org/10.1103/PhysRevApplied.13.034014
For a better understanding of multistimuli-responsive caloric materials with a first-order transition and for optimization of their functional properties, it is necessary to predict the behavior of the material under changes of both magnetic field and pressure. Here, we design and build a special device that can provide a self-consistent set of parameters needed for the comprehensive characterization of multistimuli-responsive functional magnetic materials. Using this scientific instrument, a data set of simultaneously measured magnetization, M(T)H, and volume magnetostriction, ω(T)H, values are obtained for LaFe11.4Si1.6 with a first-order transition. Furthermore, based on simultaneously measured M(T) and ω(T) dependencies obtained at ambient pressure, we develop an approach that allows the behavior of magnetization under different pressures, M(T)P, to be described analytically. Additional parameters, such as compressibility, κ(T); thermal expansion coefficient, α(T); and magnetoelastic interaction or effective magnetovolume coupling constant, CMV, are determined. For verification of our developed model, direct measurements of magnetization under external pressure (up to P = 1 GPa) are carried out on the same sample as that used for simultaneous measurement of magnetization and magnetovolume effect. A comparison of simulated M(T)P dependencies with experimental M(T)P confirms that our approach provides a more realistic behavior of transition temperature under pressure, TC(P), than that of the TC(P) predicted by the Bean-Rodbell model; thus, this approach is more suitable for predicting the behavior of multistimuli-responsive caloric materials with first-order transitions under changes of both magnetic field and pressure.
https://doi.org/10.1103/PhysRevApplied.13.034014
Physical Review Applied
D.Y. Karpenkov, A.Y. Karpenkov, K.P. Skokov, I.A. Radulov, M. Zheleznyi, T. Faske, O. Gutfleisch, Phys. Rev. Appl. 13 (2020) 034014.
Synthesis of FeNi tetrataenite phase by means of chemical precipitation
FeNi L10 (tetrataenite) phase has great perspectives for hard magnetic materials production. In this paper we report on synthesis of this phase in chemically co-precipitated FeNi nanopowder by means of a thermal treatment procedure which includes cycling oxidation and reduction processes at 320 °C. The presence of the FeNi L10 phase in the samples was confirmed by magnetic measurements and differential scanning calorimetry analysis.
https://doi.org/10.1016/j.jmmm.2017.11.040
FeNi L10 (tetrataenite) phase has great perspectives for hard magnetic materials production. In this paper we report on synthesis of this phase in chemically co-precipitated FeNi nanopowder by means of a thermal treatment procedure which includes cycling oxidation and reduction processes at 320 °C. The presence of the FeNi L10 phase in the samples was confirmed by magnetic measurements and differential scanning calorimetry analysis.
https://doi.org/10.1016/j.jmmm.2017.11.040
Journal of Magnetism and Magnetic Materials
V.L. Kurichenko, D.Y. Karpenkov, A.Y. Karpenkov, M.B. Lyakhova, V.V. Khovaylo, J. Magn. Magn. Mater. 470 (2019) 33–37.
Flexible Thermoelectric Polymer Composites Based on a Carbon Nanotubes Forest
Polymer‐based composites are of high interest in the field of thermoelectric (TE) materials because of their properties: abundance, low thermal conductivity, and nontoxicity. In applications, like TE for wearable energy harvesting, where low operating temperatures are required, polymer composites demonstrate compatible with the targeted specifications. The main challenge is reaching high TE efficiency. Fillers and chemical treatments can be used to enhance TE performance of the polymer matrix. The combined application of vertically aligned carbon nanotubes forest (VA‐CNTF) is demonstrated as fillers and chemical post‐treatment to obtain high‐efficiency TE composites, by dispersing VA‐CNTF into a poly (3,4‐ethylenedioxythiophene) polystyrene sulfonate matrix. The VA‐CNTF keeps the functional properties even in flexible substrates. The morphology, structure, composition, and functional features of the composites are thoroughly investigated. A dramatic increase of power factor is observed at the lowest operating temperature difference ever reported. The highest Seebeck coefficient and electrical conductivity are 58.7 µV K−1 and 1131 S cm−1, respectively. The highest power factor after treatment is twice as high in untreated samples. The results demonstrate the potential for the combined application of VA‐CNTF and chemical post‐treatment, in boosting the TE properties of composite polymers toward the development of high efficiency, low‐temperature, flexible TEs.
https://doi.org/10.1002/adfm.201801246
Polymer‐based composites are of high interest in the field of thermoelectric (TE) materials because of their properties: abundance, low thermal conductivity, and nontoxicity. In applications, like TE for wearable energy harvesting, where low operating temperatures are required, polymer composites demonstrate compatible with the targeted specifications. The main challenge is reaching high TE efficiency. Fillers and chemical treatments can be used to enhance TE performance of the polymer matrix. The combined application of vertically aligned carbon nanotubes forest (VA‐CNTF) is demonstrated as fillers and chemical post‐treatment to obtain high‐efficiency TE composites, by dispersing VA‐CNTF into a poly (3,4‐ethylenedioxythiophene) polystyrene sulfonate matrix. The VA‐CNTF keeps the functional properties even in flexible substrates. The morphology, structure, composition, and functional features of the composites are thoroughly investigated. A dramatic increase of power factor is observed at the lowest operating temperature difference ever reported. The highest Seebeck coefficient and electrical conductivity are 58.7 µV K−1 and 1131 S cm−1, respectively. The highest power factor after treatment is twice as high in untreated samples. The results demonstrate the potential for the combined application of VA‐CNTF and chemical post‐treatment, in boosting the TE properties of composite polymers toward the development of high efficiency, low‐temperature, flexible TEs.
https://doi.org/10.1002/adfm.201801246
Advanced Functional Materials
K. Yusupov, S. Stumpf, S. You, A. Bogach, P.M. Martinez, A. Zakhidov, U.S. Schubert, V. Khovaylo, A. Vomiero, Adv. Funct. Mater. 28 (2018) 1801246.
Plastically deformed Gd-X (X = Y, In, Zr, Ga, B) solid solutions for magnetocaloric regenerator of parallel plate geometry
Despite significant progress in the study of materials undergoing first-order magnetic phase transitions accompanied by the so-called giant magnetocaloric effect (MCE), Gd metal still remains the most widely used material in prototypes of magnetic refrigerators due to its significant MCE, good machinability and reasonable mechanical and chemical stabilities. Alloying of Gd enables fine-tuning the Curie temperature of Gd-based solid solutions (all show second-order phase transitions), for graded magnetocaloric materials. Commonly, Gd packed spheres are used as a magnetocaloric working substance in the active magnetic regenerator (AMR) cycle. In this work, we show that the optimized stacking parallel-plate geometry of AMR bed made of Gd is more effective for application at frequencies 1–10 Hz then the packed spheres. We also give a short review on magnetocaloric properties of cold-rolled Gd-X (X = Y, In, Zr, Ga, B) solid solutions. These materials can be produced in the form of thin (∼100 μm) foils/plates to ensure rapid heat exchange between to the heat transfer fluid. Although the magnetocaloric effect decreases in the as-rolled foils, it can be recovered by thermal treatment of the final stacked-plates regenerators. Gd-Y, Gd-In and Gd-Zr solid solutions have magnetocaloric properties, comparable to the MCE of pure Gd in a wide temperature working span up to 37 K, 36 K, and 16 K respectively, which makes them suitable magnetocaloric material systems for testing the fundamental heat exchangers geometries at ambient temperature and in frequencies of 1–10 Hz.
https://doi.org/10.1016/j.jallcom.2018.04.264
Despite significant progress in the study of materials undergoing first-order magnetic phase transitions accompanied by the so-called giant magnetocaloric effect (MCE), Gd metal still remains the most widely used material in prototypes of magnetic refrigerators due to its significant MCE, good machinability and reasonable mechanical and chemical stabilities. Alloying of Gd enables fine-tuning the Curie temperature of Gd-based solid solutions (all show second-order phase transitions), for graded magnetocaloric materials. Commonly, Gd packed spheres are used as a magnetocaloric working substance in the active magnetic regenerator (AMR) cycle. In this work, we show that the optimized stacking parallel-plate geometry of AMR bed made of Gd is more effective for application at frequencies 1–10 Hz then the packed spheres. We also give a short review on magnetocaloric properties of cold-rolled Gd-X (X = Y, In, Zr, Ga, B) solid solutions. These materials can be produced in the form of thin (∼100 μm) foils/plates to ensure rapid heat exchange between to the heat transfer fluid. Although the magnetocaloric effect decreases in the as-rolled foils, it can be recovered by thermal treatment of the final stacked-plates regenerators. Gd-Y, Gd-In and Gd-Zr solid solutions have magnetocaloric properties, comparable to the MCE of pure Gd in a wide temperature working span up to 37 K, 36 K, and 16 K respectively, which makes them suitable magnetocaloric material systems for testing the fundamental heat exchangers geometries at ambient temperature and in frequencies of 1–10 Hz.
https://doi.org/10.1016/j.jallcom.2018.04.264
Journal of Alloys and Compounds
S. Taskaev, V. Khovaylo, D. Karpenkov, I. Radulov, M. Ulyanov, D. Bataev, A. Dyakonov, D. Gunderov, K. Skokov, O. Gutfleisch, J. Alloys Compd. 754 (2018) 207–214.
Intrinsic magnetic properties of hydrided and non-hydrided Nd5Fe17 single crystals
We report on the spontaneous magnetization Ms, the exchange stiffness constant A and the magnetocrystalline anisotropy constants K1, K2, K3 and K4 of Nd5Fe17 and Nd5Fe17H16 single crystals. Field dependencies of magnetization M(H) were measured along a, b' and c principal crystallographic directions within the temperature range of 10–600 K and magnetic fields up to 40 T. Large anisotropies of spontaneous magnetization and high-field susceptibility were revealed for both compounds. The exchange stiffness parameter A was determined using Bloch's T3/2 law. In order to provide high accuracy detection of K1(T), K2(T), K3(T) and K4(T), we used two different approaches: the modified Sucksmith- Thompson technique and the Néel's phase method.
https://doi.org/10.1016/j.jallcom.2018.01.239
We report on the spontaneous magnetization Ms, the exchange stiffness constant A and the magnetocrystalline anisotropy constants K1, K2, K3 and K4 of Nd5Fe17 and Nd5Fe17H16 single crystals. Field dependencies of magnetization M(H) were measured along a, b' and c principal crystallographic directions within the temperature range of 10–600 K and magnetic fields up to 40 T. Large anisotropies of spontaneous magnetization and high-field susceptibility were revealed for both compounds. The exchange stiffness parameter A was determined using Bloch's T3/2 law. In order to provide high accuracy detection of K1(T), K2(T), K3(T) and K4(T), we used two different approaches: the modified Sucksmith- Thompson technique and the Néel's phase method.
https://doi.org/10.1016/j.jallcom.2018.01.239
Journal of Alloys and Compounds
D.Y. Karpenkov, K.P. Skokov, M.B. Lyakhova, I.A. Radulov, T. Faske, Y. Skourski, O. Gutfleisch, J. Alloys Compd. 741 (2018) 1012–1020.
A quantitative criterion for determining the order of magnetic phase transitions using the magnetocaloric effect
The ideal magnetocaloric material would lay at the borderline of a first-order and a second-order phase transition. Hence, it is crucial to unambiguously determine the order of phase transitions for both applied magnetocaloric research as well as the characterization of other phase change materials. Although Ehrenfest provided a conceptually simple definition of the order of a phase transition, the known techniques for its determination based on magnetic measurements either provide erroneous results for specific cases or require extensive data analysis that depends on subjective appreciations of qualitative features of the data. Here we report a quantitative fingerprint of first-order thermomagnetic phase transitions: the exponent n from field dependence of magnetic entropy change presents a maximum of n > 2 only for first-order thermomagnetic phase transitions. This model-independent parameter allows evaluating the order of phase transition without any subjective interpretations, as we show for different types of materials and for the Bean–Rodbell model.
https://doi.org/10.1038/s41467-018-05111-w
The ideal magnetocaloric material would lay at the borderline of a first-order and a second-order phase transition. Hence, it is crucial to unambiguously determine the order of phase transitions for both applied magnetocaloric research as well as the characterization of other phase change materials. Although Ehrenfest provided a conceptually simple definition of the order of a phase transition, the known techniques for its determination based on magnetic measurements either provide erroneous results for specific cases or require extensive data analysis that depends on subjective appreciations of qualitative features of the data. Here we report a quantitative fingerprint of first-order thermomagnetic phase transitions: the exponent n from field dependence of magnetic entropy change presents a maximum of n > 2 only for first-order thermomagnetic phase transitions. This model-independent parameter allows evaluating the order of phase transition without any subjective interpretations, as we show for different types of materials and for the Bean–Rodbell model.
https://doi.org/10.1038/s41467-018-05111-w
Nature Communications
J.Y. Law, V. Franco, L.M. Moreno-Ramírez, A. Conde, D.Y. Karpenkov, I. Radulov, K.P. Skokov, O. Gutfleisch, Nat. Commun. 9 (2018) 2680.
Rapid preparation of InxCo4Sb12 with a record-breaking ZT = 1.5: the role of the In overfilling fraction limit and Sb overstoichiometry
Samples of indium-filled InxCo4Sb12 skutterudite were successfully synthesized by conventional induction melting without the use of evacuated quartz ampoules. Addition of In above the filling fraction limit (x ≈ 0.22) and adjustment of Sb excess in the induction-melted InxCo4Sb12 ingots allowed us to suppress formation of the unwanted CoSb2 phase in the sintered samples and effectively control the amount of the InSb impurity phase which precipitated in nanometer-sized regions along the grain boundaries of the main skutterudite phase. Measurements of the Seebeck coefficient, electrical conductivity and thermal conductivity of the InxCo4Sb12 samples with nominal In contents x = 0.2, 0.6, and 1.0 revealed a simultaneous increase in the electrical conductivity and decrease in the thermal conductivity. This results in the record value of the thermoelectric figure of merit ZT ≈ 1.5 for single-filled skutterudites which was attained in the In1Co4Sb12 sample at 725 K.
https://doi.org/10.1039/C6TA09092C
Samples of indium-filled InxCo4Sb12 skutterudite were successfully synthesized by conventional induction melting without the use of evacuated quartz ampoules. Addition of In above the filling fraction limit (x ≈ 0.22) and adjustment of Sb excess in the induction-melted InxCo4Sb12 ingots allowed us to suppress formation of the unwanted CoSb2 phase in the sintered samples and effectively control the amount of the InSb impurity phase which precipitated in nanometer-sized regions along the grain boundaries of the main skutterudite phase. Measurements of the Seebeck coefficient, electrical conductivity and thermal conductivity of the InxCo4Sb12 samples with nominal In contents x = 0.2, 0.6, and 1.0 revealed a simultaneous increase in the electrical conductivity and decrease in the thermal conductivity. This results in the record value of the thermoelectric figure of merit ZT ≈ 1.5 for single-filled skutterudites which was attained in the In1Co4Sb12 sample at 725 K.
https://doi.org/10.1039/C6TA09092C
Journal of Materials Chemistry A
V.V. Khovaylo, T.A. Korolkov, A.I. Voronin, M.V. Gorshenkov, A.T. Burkov, J. Mater. Chem. A. 5 (2017) 3541–3546.
Production and properties of metal-bonded La(Fe,Mn,Si)13Hx composite material
Due to their excellent magnetocaloric properties hydrogenated La(Fe,Mn,Si)13 are considered as promising and cost efficient materials for active magnetic regenerators operating near room temperature. However, due to their poor mechanical and chemical stability this alloys can not be directly implemented in a cooling machine. A solution of the problem is the production of a composite La(Fe,Mn,Si)13Hx magnetocaloric materials by using adhesive-bonding techniques similar to those used for production of polymer-bonded permanent magnets. Upon bonding one has to consider that the thermal stability of the polymer binder is rather low. Main disadvantage of a polymer-bonded composite is the fatigue due to the mechanical stress caused by the large magnetovolume effect in La(Fe,Mn,Si)13Hx. Our article reports on a new method and equipment to produce metal-bonded magnetocaloric material using the low melting eutectic Field's alloy as a binder. A comprehensive investigation of the magnetocaloric, mechanical, chemical and thermal transport properties of polymer-bonded and metal-bonded magnetocaloric material is presented.
https://doi.org/10.1016/j.actamat.2017.01.054
Due to their excellent magnetocaloric properties hydrogenated La(Fe,Mn,Si)13 are considered as promising and cost efficient materials for active magnetic regenerators operating near room temperature. However, due to their poor mechanical and chemical stability this alloys can not be directly implemented in a cooling machine. A solution of the problem is the production of a composite La(Fe,Mn,Si)13Hx magnetocaloric materials by using adhesive-bonding techniques similar to those used for production of polymer-bonded permanent magnets. Upon bonding one has to consider that the thermal stability of the polymer binder is rather low. Main disadvantage of a polymer-bonded composite is the fatigue due to the mechanical stress caused by the large magnetovolume effect in La(Fe,Mn,Si)13Hx. Our article reports on a new method and equipment to produce metal-bonded magnetocaloric material using the low melting eutectic Field's alloy as a binder. A comprehensive investigation of the magnetocaloric, mechanical, chemical and thermal transport properties of polymer-bonded and metal-bonded magnetocaloric material is presented.
https://doi.org/10.1016/j.actamat.2017.01.054
Acta Materialia
I.A. Radulov, D.Y. Karpenkov, K.P. Skokov, A.Y. Karpenkov, T. Braun, V. Brabänder, T. Gottschall, M. Pabst, B. Stoll, O. Gutfleisch, Acta Mater. 127 (2017) 389–399.
Bulk combinatorial analysis for searching new rare-earth free permanent magnets: Reactive crucible melting applied to the Fe-Sn binary system
The reactive crucible melting method is known to be an efficient and low-cost bulk combinatorial synthesis technique to search for new phases. In this work, we tested this technique by investigating the Fe-Sn binary system. For high-throughput characterization, this synthesis technique was combined with energy dispersive x-ray spectroscopy as well as magneto-optical Kerr microscopy. The latter was used for identification of desired phases with uniaxial magnetic anisotropy. Reliability of the reactive crucible method was evaluated by comparison of the phase composition forming in the reactive crucible with phases appearing in conventionally melted samples and with the phases represented in the reported Fe-Sn phase diagram. It was found that the Fe5Sn3 phase, existing in the equilibrium phase diagram at 800 °C and forming in conventionally melted alloys, does not exist in the diffusion zone of the reactive crucible. The problem of 'missing phases' is discussed. In addition, we have shown that the anisotropy energy obtained by quantitative analysis of the uniaxial domain structure of Fe3Sn2 phase, gives the value of 1 MJ/m3, whereas K1 evaluated by conventional magnetometry is ~0.07 MJ/m3 only, by this demonstrating how erroneous the assessment of K1 from domain structure can be. Finally, a new unit cell is proposed for Fe5Sn3 phase, which is commensurately modulated by the orthorhombic unit cell with lattice parameters of a = 4.221 Å, b = 7.322 Å, c = 5.252 Å and the space group Pbcm(α00)0s0 with a modulation vector of q = (½,0,0).
https://doi.org/10.1016/j.actamat.2017.09.036
The reactive crucible melting method is known to be an efficient and low-cost bulk combinatorial synthesis technique to search for new phases. In this work, we tested this technique by investigating the Fe-Sn binary system. For high-throughput characterization, this synthesis technique was combined with energy dispersive x-ray spectroscopy as well as magneto-optical Kerr microscopy. The latter was used for identification of desired phases with uniaxial magnetic anisotropy. Reliability of the reactive crucible method was evaluated by comparison of the phase composition forming in the reactive crucible with phases appearing in conventionally melted samples and with the phases represented in the reported Fe-Sn phase diagram. It was found that the Fe5Sn3 phase, existing in the equilibrium phase diagram at 800 °C and forming in conventionally melted alloys, does not exist in the diffusion zone of the reactive crucible. The problem of 'missing phases' is discussed. In addition, we have shown that the anisotropy energy obtained by quantitative analysis of the uniaxial domain structure of Fe3Sn2 phase, gives the value of 1 MJ/m3, whereas K1 evaluated by conventional magnetometry is ~0.07 MJ/m3 only, by this demonstrating how erroneous the assessment of K1 from domain structure can be. Finally, a new unit cell is proposed for Fe5Sn3 phase, which is commensurately modulated by the orthorhombic unit cell with lattice parameters of a = 4.221 Å, b = 7.322 Å, c = 5.252 Å and the space group Pbcm(α00)0s0 with a modulation vector of q = (½,0,0).
https://doi.org/10.1016/j.actamat.2017.09.036
Acta Materialia
B. Fayyazi, K.P. Skokov, T. Faske, D.Y. Karpenkov, W. Donner, O. Gutfleisch, Acta Mater. 141 (2017) 434–443.
Optimization of ball-milling process for preparation of Si–Ge nanostructured thermoelectric materials with a high figure of merit
We report on the thermoelectric properties of nanostructured SiGe alloys which are well known to be reliable materials at high temperatures. Our aim was to optimize the synthesis parameters in order to simplify the manufacturing process. Here we show that 1 h ball milling process followed by consolidation of the mechanically alloyed nanopowders by spark plasma sintering is sufficient to prepare an n-type nanostructured SiGe bulk sample with a high figure of merit ZT ∼1.1 at 800 °C.
https://doi.org/10.1016/j.scriptamat.2014.10.001
We report on the thermoelectric properties of nanostructured SiGe alloys which are well known to be reliable materials at high temperatures. Our aim was to optimize the synthesis parameters in order to simplify the manufacturing process. Here we show that 1 h ball milling process followed by consolidation of the mechanically alloyed nanopowders by spark plasma sintering is sufficient to prepare an n-type nanostructured SiGe bulk sample with a high figure of merit ZT ∼1.1 at 800 °C.
https://doi.org/10.1016/j.scriptamat.2014.10.001
Scripta Materialia
A.A. Usenko, D.O. Moskovskikh, M.V. Gorshenkov, A.V. Korotitskiy, S.D. Kaloshkin, A.I. Voronin, V.V. Khovaylo, Scr. Mater. 96 (2015) 9–12.
Magnetocaloric effect in "reduced" dimensions: Thin films, ribbons, and microwires of Heusler alloys and related compounds
Room temperature magnetic refrigeration is an energy saving and environmentally‐friendly technology, which has developed rapidly from a basic idea to prototype devices. The performance of magnetic refrigerators crucially depends on the magnetocaloric properties and the geometry of the employed refrigerants. Here we review the magnetocaloric properties of Heusler alloys and related compounds with a high surface to volume ratio such as films, ribbons, and microwires, and compare them with their bulk counterparts.
https://doi.org/10.1002/pssb.201451217
Room temperature magnetic refrigeration is an energy saving and environmentally‐friendly technology, which has developed rapidly from a basic idea to prototype devices. The performance of magnetic refrigerators crucially depends on the magnetocaloric properties and the geometry of the employed refrigerants. Here we review the magnetocaloric properties of Heusler alloys and related compounds with a high surface to volume ratio such as films, ribbons, and microwires, and compare them with their bulk counterparts.
https://doi.org/10.1002/pssb.201451217
physica status solidi (b) – basic solid state physics
V.V. Khovaylo, V.V. Rodionova, S.N. Shevyrtalov, V. Novosad, Phys. Status Solidi 251 (2014) 2104–2113.
Inconvenient magnetocaloric effect in ferromagnetic shape memory alloys
Critical analysis available in the literature experimental results on magnetocaloric effect in ferromagnetic shape memory alloys Ni–Mn–X (X = Ga, In, Sn, Sb) is given. Based on a model developed by Pecharsky et al. [22], it is shown that the isothermal magnetic field-induced entropy change in the Ni–Mn–X alloys should not greatly exceed 30 J/kg K. Considering thermodynamics of temperature- and magnetic field-induced martensitic transformations, it is demonstrated that a contribution of the structural subsystem to the magnetocaloric effect in the Ni–Mn–X alloys studied so far is irreversible in magnetic fields below 5 T. This makes ferromagnetic shape memory alloys an inconvenient system for the practical application in modern magnetic refrigeration technology.
https://doi.org/10.1016/j.jallcom.2012.03.035
Critical analysis available in the literature experimental results on magnetocaloric effect in ferromagnetic shape memory alloys Ni–Mn–X (X = Ga, In, Sn, Sb) is given. Based on a model developed by Pecharsky et al. [22], it is shown that the isothermal magnetic field-induced entropy change in the Ni–Mn–X alloys should not greatly exceed 30 J/kg K. Considering thermodynamics of temperature- and magnetic field-induced martensitic transformations, it is demonstrated that a contribution of the structural subsystem to the magnetocaloric effect in the Ni–Mn–X alloys studied so far is irreversible in magnetic fields below 5 T. This makes ferromagnetic shape memory alloys an inconvenient system for the practical application in modern magnetic refrigeration technology.
https://doi.org/10.1016/j.jallcom.2012.03.035
Journal of Alloys and Compounds
V. Khovaylo, J. Alloys Compd. 577 (2013) S362–S366.
Publications:
Last update: February 22, 2022
Last update: February 22, 2022
- Adam, A. M.; Diab, A. K.; Tolan, M.; El-Qahtani, Z. M. H.; Refaat, A. A.; El-Hadek, M. A.; Elsehly, E. M.; El-Khouly, A.; Alharbi, A. N.; Khovaylo, V.; Ataalla, M. Outstanding Optical Properties of Thermally Grown (Bi2Se3)1-x(Bi2Te3)x Thin Films. Mater. Sci. Semicond. Process. 2022, 143, 106557.
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https://doi.org/10.1016/j.jallcom.2022.164051. - Gamzatov, A. G.; Batdalov, A. B.; Aliev, A. M.; Khizriev, S. K.; Khovaylo, V. V.; Ghotbi Varzaneh, A.; Kameli, P.; Abdolhosseini Sarsari, I.; Jannati, S. Anomalous Heat Transfer near the Martensite-Austenite Phase Transition in Ni50Mn28Ga22(Cu, Zn) (x = 0; 1.5) Alloys. Intermetallics 2022, 143, 107491.
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https://doi.org/10.1016/j.jallcom.2021.163092. - Roslyakov, S.; Yermekova, Z.; Trusov, G.; Khort, A.; Evdokimenko, N.; Bindiug, D.; Karpenkov, D.; Zhukovskyi, M.; Degtyarenko, A.; Mukasyan, A. One-Step Solution Combustion Synthesis of Nanostructured Transition Metal Antiperovskite Nitride and Alloy. Nano-Structures & Nano-Objects 2021, 28, 100796.
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https://doi.org/10.1038/s41598-021-86936-2 - Semenova, E. M.; Ivanov, D. V.; Lyakhova, M. B.; Kuznetsova, Y. V.; Karpenkov, D. Y.; Karpenkov, A. Y.; Ivanova, A. I.; Antonov, A. S.; Sdobnyakov, N. Y. Fractal Geometry of the Nano- and Magnetic Domain Structures of Sm–Co–Cu–Fe Ferromagnetic Alloy in a High Coercive State. Bull. Russ. Acad. Sci. Phys. 2021, 85 (9), 955–958.
https://doi.org/10.3103/S1062873821090252 - Bykov, E.; Liu, W.; Skokov, K.; Scheibel, F.; Gutfleisch, O.; Taskaev, S.; Khovaylo, V.; Plakhotskiy, D.; Mejia, C. S.; Wosnitza, J.; Gottschall, T. Magnetocaloric Effect in the Laves-Phase Ho1−xDyxAl2 Family in High Magnetic Fields. Phys. Rev. Mater. 2021, 5 (9), 095405.
https://doi.org/10.1103/PhysRevMaterials.5.095405. - Novitskii, A. P.; Khovaylo, V. V.; Mori, T. Recent Developments and Progress on BiCuSeO Based Thermoelectric Materials. Nanobiotechnology Reports 2021, 16 (3), 294–307.
https://doi.org/10.1134/S2635167621030150 - Chernyshova, E.; Serhiienko, I.; Kolesnikov, E.; Voronin, A.; Zheleznyy, M.; Fedotov, A.; Khovaylo, V. Influence of NiO Nanoparticles on the Thermoelectric Properties of (ZnO)1–x(NiO)x Composites. Nanobiotechnology Reports 2021, 16 (3), 381–386.
https://doi.org/10.1134/S2635167621030034 - Fedotov, A. K.; Pashkewich, A. V.; Khovailo, V. V.; Kharchenko, A. A.; Poddenezhnyi, E. N.; Bliznyuk, L. A.; Fedotova, V. V. Electric and Thermoelectric Properties of ZnO-Based Ceramics Doped with Iron and Cobalt. Nanobiotechnology Reports 2021, 16 (3), 373–380.
https://doi.org/10.1134/S2635167621030046 - El-Khouly, A.; Adam, A. M.; Ibrahim, E. M. M.; Nafady, A.; Karpenkov, D.; Novitskii, A.; Voronin, A.; Khovaylo, V.; Elsehly, E. M. Mechanical and Thermoelectric Properties of FeVSb-Based Half-Heusler Alloys. J. Alloys Compd. 2021, 161308.
https://doi.org/10.1016/j.jallcom.2021.161308 - Galkin, N. G.; Galkin, K. N.; Dotsenko, S. A.; Serhiienko, I. A.; Khovaylo, V. V.; Gutakovskii, A. K. Effect of Embedding of CrSi2 and β-FeSi2 Nanocrystals into n-Type Conductivity Silicon on the Transport and Thermal Generation of Carriers. Appl. Surf. Sci. 2021, 566, 150620.
https://doi.org/10.1016/j.apsusc.2021.150620 - Suresh Kumar, G.; Srinivasan, R.; Karunakaran, G.; Kolesnikov, E.; Kim, M.; Karpenkov, D. Y. Microwave-Assisted Combustion Synthesis of Soft Ferromagnetic Spinel MFe2O4 (M = Ni, Mg, Zn) Nanoparticles Using Citrus Limon Fruit Extract as a Fuel. Appl. Phys. A 2021, 127 (7), 546.
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https://doi.org/10.1007/JHEP04(2021)199 - Nguyen, T. H.; Konyukhov, Y.; Minh, N. Van; Karpenkov, D. Y.; Levina, V. V.; Karunakaran, G.; Buchirina, A. G. Magnetic Properties of Fe, Co and Ni Based Nanopowders Produced by Chemical-Metallurgy Method. Eurasian Chem. J. 2021, 23 (1), 3.
https://doi.org/10.18321/ectj1028 - Blinov, M. I.; Chernenko, V. A.; Prudnikov, V. N.; Aseguinolaza, I. R.; Barandiaran, J. M.; Lahderanta, E.; Khovailo, V. V.; Granovskii, A. B. Magnetotransport Properties of Thin Ni49.7Fe17.4Co4.2Ga28.7 Films. J. Exp. Theor. Phys. 2021, 132 (3), 457–462.
https://doi.org/10.1134/S1063776121030146 - Bhardwaj, V.; Bhattacharya, A.; Srivastava, S.; Khovaylo, V.V.; Sannigrahi, J.; Banerjee, N.; Mani, B. K.; Chatterjee, R. Strain Driven Emergence of Topological Non-Triviality in YPdBi Thin Films. Sci. Rep. 2021, 11 (1), 7535.
https://doi.org/10.1038/s41598-021-86936-2 - Taskaev, S.; Khovaylo, V.; Ulyanov, M.; Bataev, D.; Basharova, A.; Kononova, M.; Plakhotskiy, D.; Bogush, M.; Zherebtsov, D.; Hu, Z. Magnetic Properties and Magnetocaloric Effect in Dy100–xYx Solid Solutions. AIP Adv. 2021, 11 (1), 015014.
https://doi.org/10.1063/9.0000191 - Novitskii, A.; Serhiienko, I.; Nepapushev, A.; Ivanova, A.; Sviridova, T.; Moskovskikh, D.; Voronin, A.; Miki, H.; Khovaylo, V. Mechanochemical Synthesis and Thermoelectric Properties of TiFe2Sn
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https://doi.org/10.1016/j.intermet.2021.107195 - Tukmakova, A.; Novotelnova, A.; Taskaev, S.; Miki, H.; Khovaylo, V. Simulation of Fe-Ti-Sb Thernary Phase Diagram at Temperatures above 900 K. Key Eng. Mater. 2021, 877, 114–119.
https://doi.org/10.4028/www.scientific.net/KEM.877.114 - Taskaev, S.; Khovaylo, V.; Ulyanov, M.; Bataev, D.; Basharova, A.; Kononova, M.; Plakhotskiy, D.; Bogush, M.; Zherebtsov, D. Magnetic and Magnetocaloric Properties of As-Cast Gd2In. Lett. Mater. 2021, 11 (1), 104–108.
https://doi.org/10.22226/2410-3535-2021-1-104-108 - El-Khouly, A.; Adam, A.M.; Novitskii, A.; Ibrahim, E.M.M.; Serhiienko, I.; Nafady, A.; Kutzhanov, M.K.; Karpenkov, D.; Voronin, A.; Khovaylo, V. Effects of Spark Plasma Sintering on Enhancing the Thermoelectric Performance of Hf–Ti Doped VFeSb Half-Heusler Alloys. J. Phys. Chem. Solids 2021, 150, 109848.
https://doi.org/10.1016/j.jpcs.2020.109848 - Musah, J.; Guo, C.; Novitskii, A.; Serhiienko, I.; Adesina, A.E.; Khovaylo, V.; Wu, C.L.; Zapien, J.A.; Roy, V.A.L. Ultralow Thermal Conductivity in Dual‐Doped N‐Type Bi2Te3 Material for Enhanced Thermoelectric Properties. Adv. Electron. Mater. 2021, 7 (2), 2000910.
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https://doi.org/10.3390/nano11020341 - Eremin, S.A.; Anikin, V.N.; Sinitsyn, D.Y.; Leontiev, I.A.; Kudryashov, O.Y.; Khovaylo, V.V.; Spitsyn, B.V. Binding of Diamond Powder Layers by CVD Diamond. Manuf. Lett. 2020, 26, 25–28.
https://doi.org/10.1016/j.mfglet.2020.09.002 - Dilmieva, E.T.; Koshkid'ko, Y.S.; Koledov, V.V.; Khovaylo, V.V.; Cwik, J.; Shavrov, V.G.; Sampath, V. Role of Magnetic and Temperature Cycling on Martensite Formation in Ni2.19Mn0.81Ga Single Crystals of a Heusler Alloy. J. Appl. Phys. 2020, 127 (17), 175103.
https://doi.org/10.1063/5.0003287 - Jiang, J.; Khovaylo, V.V.; Louzguine-Luzgin, D.V. A Cu-Y-Al Glassy Alloy with Strong Beta Relaxation and Low Activation Energies for Structural Relaxation and Crystallization. Thermochim. Acta 2020, 693, 178762.
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