Article
Chemistry, Inorganic & Nuclear
Romana-Iryna Martyniak, Nataliya Muts, Matej Bobnar, Lev Akselrud, Roman Gladyshevskii
Summary: The crystal structures of three (Cr,Ni)4-xTxSi phases were refined and found to have Au4Al-type structures. The temperature dependence of the magnetic susceptibility showed that they are paramagnetic materials.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Nanoscience & Nanotechnology
Linhan Li, Yufang Zhang, Muzhi Ma, Yanlin Jia, Zhu Xiao, Jinhui Hu, Zhao Xin, Xinfeng Jiang, Xianfeng Liao, Xiangyu Yu
Summary: Cu-0.45Cr-0.15 Mg and Cu-0.45Cr-0.15Mg-0.02Si (wt.%) alloys show excellent comprehensive properties after multi-stage thermo-mechanical treatment, achieving high strength, high conductivity, and good elongation. Different forms of precipitation were observed in various aging stages, with Cu-0.45Cr-0.15Mg-0.02Si alloy showing more precipitation. The addition of Si promotes the precipitation of Cr and refines precipitation, preserving high density of dislocation and resulting in superior strength and conductivity.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Yin Yang, Gui Kuang, Rengeng Li
Summary: Cu-0.4Cr alloys with microalloying of Hf and a modified rolling-aging process showed improved mechanical properties, including high strength, high electrical conductivity, and high ductility. The microstructures of the alloys were characterized by transmission electron microscopy and X-ray line broadening analysis. The Cu-Cr-Hf alloy with reduced Hf content exhibited good combination of strength, electrical conductivity, and ductility.
Article
Nanoscience & Nanotechnology
Jiazhi Li, Hua Ding, Baomian Li, Weilin Gao, Jie Bai, Gang Sha
Summary: The addition of Sn in Cu-Cr-Sn alloys promotes the precipitation of Cr phase and inhibits the coarsening of Cr precipitates, resulting in improved strength. Precipitation strengthening is the dominant mechanism for increasing the yield strength. Additionally, the high softening temperature of the designed Cu-Cr-Sn alloys is attributed to the inhibitory effect of Sn on the coarsening of Cr precipitates and delayed recrystallization of deformed structure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Yeong-Woo Cho, Jae-Jin Sim, Jong-Soo Byeon, Taek-Soo Kim, Kee-Ahn Lee, Heung-Jin Ju, Seok-Jun Seo, Kyoung-Tae Park
Summary: In this study, Cu-Cr-Mo alloy contact materials were investigated for high-voltage vacuum interrupter applications, demonstrating their potential with proper density, hardness, and electrical conductivity. The composite materials produced through specific methods showed suitable properties for high-voltage vacuum interrupter use, opening up new possibilities.
Article
Materials Science, Multidisciplinary
Bowen Ma, Bailing An, Xue Zhao, Yunchao Li, Jingwen Du, Engang Wang
Summary: Doping Sc can enhance the mechanical properties of Cu-Cr-Zr alloy while maintaining its electrical conductivity. The addition of Sc leads to the formation of a new intermetallic compound with Zr, which segregates at the grain boundary. The solution + rolling + aging process results in improved properties, including the formation of nanoscale precipitates and subgrains. The addition of Sc increases the ultimate tensile strength and hardness of the alloy without significant reduction in electrical conductivity, expanding its application range.
Article
Chemistry, Physical
Longjian Li, Huijun Kang, Siruo Zhang, Rengeng Li, Xiong Yang, Zongning Chen, Enyu Guo, Tongmin Wang
Summary: The Cu-1Cr-0.2Zr (wt%) alloys with trace Mg (0.05 wt%) were prepared using a two-step cryorolling and aging (CRA) process. The effects of the CRA process and Mg element on microstructural evolution, mechanical properties, and electrical conductivity were investigated. The two-step CRA process resulted in the formation of high-density deformation twins and dislocations, while the addition of Mg element decreased the widths of deformation bands and twins. The fine precipitates and depletion of Cr and Zr elements contributed to the enhanced performance of Cu-Cr-Zr-Mg alloys, achieving high tensile strength and electrical conductivity simultaneously.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Jiazhi Li, Hua Ding, Baomian Li
Summary: The study revealed the relationship between the rolling-aging sequence and the microstructure evolution, mechanical-electrical properties of a hot rolled-quenched Cu-0.67Cr-0.27Zr-0.12Ni-0.03Si-0.04Ti alloy. A good combination of strength and electrical conductivity was achieved in the alloy through a specific aging-rolling-aging process, with strength improvement mainly attributed to dislocation density strengthening.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Joonho Bang, Hyun-Sik Kim, Dong Ho Kim, Se Woong Lee, Okmin Park, Sang-il Kim
Summary: Transition metal dichalcogenides have attracted renewed attention as promising thermoelectric materials due to their unique structures and superior electronic properties. In this study, the electrical transport properties of a series of Hf(Se,Te)(2) samples were investigated, revealing a wide range of electrical properties based on the composition evolution. HfTe2 exhibits metallic conduction, while HfSe2 shows semiconducting conduction.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Yihai Yang, Qian Lei, Huan Liu, Jianda Hong, Zhen Han, Qi An, Jimin Shan, Xi Chen, Haoran Xu, Zhu Xiao, Shen Gong
Summary: This study characterized the second phase particles in Cu-Cr-Nb alloys and uncovered their crystal structure, precipitation, phase transformation behavior, and orientation relationship. The findings are significant for developing high-performance Cu-Cr-Nb alloys.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Vo Van On, Huynh Thi Phuong Thuy, Hoang Van Ngoc, J. Guerrero-Sanchez, D. M. Hoat
Summary: Lateral heterostructures of ZrSe2 and HfSe2 monolayers were investigated using first-principles calculations and PAW method. The stability of the materials was examined through phonon dispersion curves and AIMD simulations. Charge transfer from Zr and Hf to Se atoms resulted in predominantly ionic chemical bonds. The studied materials exhibited wide-gap semiconductor characteristics, with energy gaps ranging from 1.17 to 1.26 eV, and good light absorption properties. Magnetization was observed in the lateral heterostructures with Zr and Hf vacancies, while non-magnetic semiconductor properties were preserved with Se vacancies and antisite defects. This research introduces new lateral heterostructures for optoelectronic applications and provides insights into the effects of interline defects.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Chenying Shi, Muzhi Ma, Biaobiao Yang, Yuling Liu, Yushen Huang, Yong Du
Summary: In this study, the effect of Ti content on the microstructure, mechanical, and electrical properties of Cu-Cr-Zr alloys was investigated. The electrical conductivity decreased with increasing Ti content due to electron scattering. The higher hardness/strength was attributed to higher dislocation density and finer FCC-Cr precipitates. Thermodynamic and kinetic calculations showed that increasing Ti content facilitated the nucleation of FCC-Cr but hindered its growth process.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Yaxing Ma, Qian Lei, Jinjun Xu, Yuxin Liang, Xiangpeng Meng, Yibo Li, Zhu Xiao
Summary: Various attempts were made to enhance the softening temperature, strength, and electrical conductivity of Cu-Cr alloys. By subjecting the fabricated Cu-2Cr-1Zn alloy to homogenization, hot rolling, solid solution treatment, cold rolling, and aging, the tensile strength, yield strength, microhardness, and electrical conductivity were improved to 616.7, 540.1 MPa, 176.7 HV, and 71.5% IACS, respectively, with a modest decrease in softening temperature to 530 degrees C. Orowan precipitation strengthening was identified as the primary mechanism responsible for the enhanced properties.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Zhu Qi Chu, Kun Xia Wei, Wei Wei, Igor V. Alexandrov, Xu Long An, Dan Dan Wang, Xiang Kui Liu
Summary: With the rapid development of 5G communication, there is an increasing demand for materials with higher strength and electrical conductivity, such as high-speed backplane connectors and integrated circuit lead frames. Copper alloys have gained wide attention due to their excellent electrical conductivity, thermal conductivity, and strength. This study proposes a new method of preparing Cu-0.5%Cr alloy using equal channel angular pressing (ECAP), deep cryogenic treatment (DCT), and aging treatment (AT). The results show that this method can significantly improve the microstructure, mechanical properties, and electrical conductivity of the Cu-0.5%Cr alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
O. V. Rybalchenko, N. R. Bochvar, G. V. Rybalchenko, N. S. Martynenko, N. Yu. Tabachkova, S. V. Dobatkin
Summary: The kinetics of phase precipitation during aging in Cu-Cr-Hf and Cu-Cr-Zr alloys after high pressure torsion (HPT) was studied. The effect of HPT on the kinetics of aging was revealed by differential scanning calorimetry (DSC), microhardness, and electrical resistivity measurements. Analysis of the microstructure and phase precipitation using transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) showed the presence of Cu matrix, chromium, and zirconium- or hafnium-rich phases. Higher degree of hardening was observed in the Cu-Cr-Hf alloy compared to the Cu-Cr-Zr alloy after HPT and subsequent aging.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
N. V. Selezneva, N. V. Baranov, E. M. Sherokalova, A. S. Volegov, A. A. Sherstobitov
Summary: Polycrystalline Fe0.25TiS2 samples exhibit an irreversible AFM-FM transition at low temperatures, leading to significant changes in resistivity and magnetic properties. The presence of a high-coercive metastable FM state is suggested to be due to the Ising character of Fe ions and magnetoelastic interaction.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Physics, Condensed Matter
N. V. Selezneva, A. S. Abouhaswa, E. V. Kislov, N. V. Baranov
Summary: With the increase in Pd content, phase segregation occurs in Fe1.02 - xPdxSe0.5Te0.5 samples, leading to the appearance of non-superconducting tetragonal FeSe-like phase and PdTe-type hexagonal phase along with the superconducting FeTe-like phase. Changes in the composition and volume fraction of the superconducting FeTe-like phase with increasing Pd content are the main reason for the decrease in critical temperature and critical current density.
PHYSICS OF THE SOLID STATE
(2021)
Article
Physics, Applied
Abdulkarim A. Amirov, Tino Gottschall, Alisa M. Chirkova, Akhmed M. Aliev, Nikolai Baranov, Konstantin P. Skokov, Oliver Gutfleisch
Summary: By conducting simultaneous measurements in a purpose-built setup, the study demonstrated the electric-field manipulation of the magnetocaloric effect and strain in a Fe49Rh51/PZT composite. Experimental results and FEM simulations showed that the deformation in the composite is mainly of a bending type, and the mechanical strain induced by the electric field is relatively small, which helps in blocking the antiferromagnetic-ferromagnetic transition.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
A. M. Chirkova, K. P. Skokov, Y. Skourski, F. Scheibel, A. Y. Karpenkov, A. S. Volegov, N. Baranov, K. Nielsch, L. Schultz, K-H Mueller, T. G. Woodcock, O. Gutfleisch
Summary: Measurements of magnetization, specific heat, and adiabatic temperature change were used to study a metamagnetic phase transition in an alloy. The transition from antiferromagnetic to ferromagnetic states showed step-like behavior at low temperatures and smooth behavior at higher temperatures. Magnetic fields induced significant adiabatic temperature changes under specific conditions.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Chemistry, Applied
Valerya Vorobeva, Denis Starichenko, Matvey Gruzdev, Ulyana Chervonova, Ruslan Zaripov, Aleksander Korolev
Summary: The magnetic features of mononuclear iron (III) complexes with tridentate Schiff base ligands were studied using different techniques. The results showed that these complexes have different spin centers and exhibit different magnetic behaviors at different temperatures. Additionally, antiferromagnetic exchange interactions between neighboring Fe (III) ions in the complexes were detected.
APPLIED ORGANOMETALLIC CHEMISTRY
(2022)
Article
Chemistry, Physical
A. A. Vaulin, A. M. Chirkova, E. A. Sherstobitova, D. A. Shishkin, E. M. Sherokalova, K. P. Skokov, N. Baranov, A. F. Gubkin
Summary: The magnetic properties, thermal expansion, heat capacity, and electrical resistivity of the cluster-glass compound Er4.8Pd2 were studied. Short-range antiferromagnetic correlations were observed in the localized magnetic moments of Er3+ ions, leading to the observation of a cluster-glass magnetic state. The crystal electric field (CEF) substantially affected the heat capacity and thermal expansion of Er4.8Pd2.
Article
Metallurgy & Metallurgical Engineering
D. F. Akramov, N. V. Selezneva, P. N. G. Ibrahim, V. V. Maikov, E. M. Sherokalova, D. K. Kuznetsov, N. V. Baranov
Summary: X-ray diffraction, scanning electron microscopy, and magnetic measurements were used to investigate the effects of milling time on the structure and magnetic properties of layered ferrimagnetic Fe7S8 and Fe7Se8 compounds. It was found that milling led to a decrease in coherent domain size, an increase in microstresses, suppression of magnetization anomalies related to low-temperature phase transformations, a substantial decrease in resulting magnetization, and a nonmonotonic change in coercive force. The observed changes in magnetization behavior are possibly attributed to the redistribution of vacancies in the cation layer during mechanical treatment.
PHYSICS OF METALS AND METALLOGRAPHY
(2022)
Article
Materials Science, Multidisciplinary
N. V. Selezneva, E. M. Sherokalova, A. Podlesnyak, M. Frontzek, N. V. Baranov
Summary: Temperature and field-dependent neutron powder diffraction (NPD) measurements were conducted to study the magnetoresistance behavior of FexTiS2 intercalated compounds with varying Fe content. The results showed that Fe0.25TiS2 and Fe0.50TiS2 compounds exhibit antiferromagnetic (AFM) order below their respective Neel temperatures, leading to a large magnetoresistance during the field-induced phase transition from AFM to ferromagnetic (FM) state. Fe0.33TiS2, on the other hand, showed short-range magnetic order and a field-induced FM alignment of Fe magnetic moments. The distribution and concentration of Fe atoms in FexTiS2 compounds played a crucial role in the formation of the magnetic state and the behavior of the magnetoresistance.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
S. N. Mozgovykh, V. A. Kazantsev, D. F. Akramov, E. M. Sherokalova, N. V. Selezneva, N. V. Baranov
Summary: Specific heat, thermal expansion, and magnetic measurements were used to investigate the interaction between the lattice and magnetic state in layered iron selenide compound Fe7Se8. The compound exhibits a ferrimagnetic order below T-N (~440 K) and a spin reorientation transition below T-sr (~115 K). Thermal expansion measurements revealed anisotropic deformations, an increase in c/a ratio, and negative volume spontaneous magnetostriction (omega(s) ~ -5.3 x 10 (-3) at 120 K) below T-N. The spin reorientation transition in Fe7Se8 showed hysteresis in specific heat and thermal expansion, as well as an anomaly in omega(s) vs T dependence. These results indicate a strong influence of magnetoelastic interactions on the properties of Fe7Se8.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Aleksei S. Komlev, Gabriela F. Cabeza, Alisa M. Chirkova, Neven Ukrainczyk, Elena A. Sherstobitova, Vladimir I. Zverev, Radel Gimaev, Nikolai V. Baranov, Nikolai S. Perov
Summary: This research investigates the electronic and magnetic properties of Fe48Cr3Rh49 alloys with different cooling rates, both experimentally and theoretically. The degree of crystalline ordering is found to be dependent on the cooling rate after alloy annealing. Theoretical calculations demonstrate significant changes in magnetic and electronic properties of the alloy with different substitutions. Correlations between structural characteristics and parameters governing the magnetic phase transition are established through comprehensive analysis of calculated and experimental data. A method for evaluating the magnetic properties of alloys obtained under different heat treatments is also proposed, offering precise control over alloy manufacturing.
Article
Physics, Multidisciplinary
Yu. V. Piskunov, V. V. Ogloblichev, A. F. Sadykov, D. F. Akramov, A. G. Smol'nikov, A. P. Gerashchenko, N. V. Selezneva, N. V. Baranov
Summary: The structural and magnetic properties of the Co7Te8 compound were studied using X-ray diffraction, magnetic susceptibility measurements, and nuclear magnetic resonance spectroscopy. A comparison with the Co7Se8 compound revealed that there is no ordering of vacancies and Co atoms in the cation layers of Co7Te8, and its crystal structure is more planar. The results showed a significant local charge and spin inhomogeneity in the compound, and it remained a Pauli paramagnet at low temperatures.
Article
Materials Science, Multidisciplinary
A. F. Gubkin, A. A. Vaulin, T. Tsutaoka, A. F. Prekul, K. P. Skokov, N. V. Baranov
Summary: The crystal structure, thermal properties, and magnetic state of the rare-earth intermetallic compound Ho7Rh3 were studied. An incommensurate antiferromagnetic (AFM) structure was observed below a certain temperature, and short-range AFM correlations were found to affect the magnetic susceptibility and thermal expansion.
Article
Metallurgy & Metallurgical Engineering
M. Kurkin, A. Telegin, P. A. Agzamova, V. D. Bessonov, D. S. Neznakhin, N. Baranov
Summary: A new approach is proposed to describe the magnetic properties of FeRh alloys, based on two assumptions about the electron properties. These assumptions explain the changes in spin structure and predict new magnetic properties of the alloy.
PHYSICS OF METALS AND METALLOGRAPHY
(2022)
Article
Materials Science, Multidisciplinary
A. S. Ovchinnikov, J. G. Ruziev, N. M. Nosova, E. M. Sherokalova, N. V. Selezneva, N. V. Baranov
Summary: Magnetic susceptibility data suggests the presence of short-range magnetic correlations in a wide temperature range above the magnetic critical temperatures of CrxNbSe2 and FexTiS2. These compounds are considered appropriate systems for the appearance of the Griffiths phase. The consistency of magnetization behavior with the scaling law proposed by Chan et al. was used to identify Griffiths behavior, and it was found that CrxNbSe2 compounds with x = 0.33 and x = 0.45 and Fe0.25TiS2 compound exhibit the Griffiths phase above magnetic ordering temperatures.
Article
Materials Science, Multidisciplinary
N. V. Selezneva, N. V. Baranov, E. M. Sherokalova, A. S. Volegov, A. A. Sherstobitov
Summary: The study investigates the magnetic states and transport properties of Fe_xTiS_2 compounds through a variety of measurements, revealing the presence of different magnetic states with increasing Fe content. The magnetic states are found to be not only dependent on the concentration of Fe atoms, but also on their distribution within the cation layers.
