scholarly journals Electrical conductivity and thermopower of high-entropy AlCoCrCuFeNi liquid alloys

2021 ◽  
Vol 25 (3) ◽  
Author(s):  
M. Dufanets ◽  
Yu. Plevachuk ◽  
V. Sklyarchuk
Keyword(s):  
Electrical Conductivity ◽  
Liquid Alloys ◽  
High Entropy

scholarly journals Electrical and thermal transport behaviours of high-entropy perovskite thermoelectric oxides

2021 ◽  
Author(s):  
Yunpeng Zheng ◽  
Mingchu Zou ◽  
Wenyu Zhang ◽  
Di Yi ◽  
Jinle Lan ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
High Performance ◽  
Bulk Sample ◽  
Defect Engineering ◽  
High Entropy ◽  
Large Lattice ◽  
Thermoelectric Oxides ◽  
First Time ◽  
Mass Fluctuation

AbstractOxide-based ceramics could be promising thermoelectric materials because of their thermal and chemical stability at high temperature. However, their mediocre electrical conductivity or high thermal conductivity is still a challenge for the use in commercial devices. Here, we report significantly suppressed thermal conductivity in SrTiO3-based thermoelectric ceramics via high-entropy strategy for the first time, and optimized electrical conductivity by defect engineering. In high-entropy (Ca0.2Sr0.2Ba0.2Pb0.2La0.2)TiO3 bulks, the minimum thermal conductivity can be 1.17 W/(m·K) at 923 K, which should be ascribed to the large lattice distortion and the huge mass fluctuation effect. The power factor can reach about 295 μW/(m·K2) by inducing oxygen vacancies. Finally, the ZT value of 0.2 can be realized at 873 K in this bulk sample. This approach proposed a new concept of high entropy into thermoelectric oxides, which could be generalized for designing high-performance thermoelectric oxides with low thermal conductivity.

Density, Viscosity, and Electrical Conductivity of Hypoeutectic Al-Cu Liquid Alloys

2008 ◽  
Vol 39 (12) ◽  
pp. 3040-3045 ◽  
Author(s):  
Y. Plevachuk ◽  
V. Sklyarchuk ◽  
A. Yakymovych ◽  
S. Eckert ◽  
B. Willers ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Liquid Alloys

Transition to Semiconducting Characteristics in Liquid Alkalimetal-Antimony-Alloys

1982 ◽  
Vol 37 (6) ◽  
pp. 587-593 ◽  
Author(s):  
H. Redslob ◽  
G. Steinleitner ◽  
W. Freyland
Keyword(s):  
Electrical Conductivity ◽  
Magnetic Susceptibility ◽  
Molar Volume ◽  
Composition Dependence ◽  
Composition Range ◽  
Liquid Alloys ◽  
Wide Composition Range ◽  
Alloy Semiconductors ◽  
Antimony Alloys ◽  
Semiconducting Behavior

Abstract The paper reports new measurements of the electrical conductivity, thermoelectric power, magnetic susceptibility, and molar volume of liquid Cs-Sb alloys and, partly, Na-Sb and K-Sb alloys. From the temperature and composition dependence of the electronic properties it is concluded that typical semiconducting behavior similar to liquid chalgogen based alloy semiconductors exists over a wide composition range. The change in bonding for 0.25≦XSb≦0.5 is qualitatively discussed and it is found that these liquid alloys are not essentially ionic in character.

scholarly journals Thermal Stability of MoNbTaVW High Entropy Alloy Thin Films

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 941
Author(s):  
Ao Xia ◽  
Robert Franz
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Thermal Stability ◽  
Solid Solution ◽  
Electrical Conductivity ◽  
High Entropy Alloy ◽  
Solid Solution Phase ◽  
Body Centered Cubic ◽  
High Entropy ◽  
Thermal Stability Of

Refractory high entropy alloys are an interesting material class because of their high thermal stability, decent electrical conductivity, and promising mechanical properties at elevated temperature. In the present work, we report on the thermal stability of body-centered cubic MoNbTaVW solid solution thin films that were synthesized by cathodic arc deposition. After vacuum annealing up to 1600 °C, the morphology, chemical composition, crystal structure, and electrical conductivity, as well as the mechanical properties, were analyzed. The observed body-centered cubic MoNbTaVW solid solution phase is stable up to 1500 °C. The evolution of electrical and mechanical properties due to the annealing treatment is discussed based on the observed structural changes of the synthesized thin films.

scholarly journals Dielectric and electromagnetic interference shielding properties of high entropy (Zn,Fe,Ni,Mg,Cd)Fe2O4 ferrite

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Adrian Radoń ◽  
Łukasz Hawełek ◽  
Dariusz Łukowiec ◽  
Jerzy Kubacki ◽  
Patryk Włodarczyk
Keyword(s):  
Electrical Conductivity ◽  
Microwave Absorption ◽  
Electromagnetic Interference ◽  
Average Crystallite Size ◽  
Shielding Effectiveness ◽  
Absorption Properties ◽  
Ac Electrical Conductivity ◽  
Microwave Absorption Properties ◽  
High Entropy ◽  
Two Stages

AbstractThe new (Zn,Mg,Ni,Fe,Cd)Fe2O4 high entropy ferrite with average crystallite size 11.8 nm was synthesized in two stages by annealing of co-precipitated amorphous precursor. The dielectric spectroscopy confirms, that the electrical conductivity and polarization processes are associated with the mobility of electrons in the structure of ferrite. It was concluded, that the both, high frequency complex dielectric permittivity as well as complex magnetic permeability are strongly temperature and frequency dependent. The AC electrical conductivity is associated with quantum mechanical tunneling of electrons and related to the transfer of charge carriers between Fe2+ and Fe3+ ions. Moreover, the microwave absorption properties were determined. The best microwave absorption properties have been confirmed in the frequency range 1.9 to 2.1 GHz for a layer which is 0.8–1 cm thick. For this range, reflection loss (RL) is lower than −25 dB and shielding effectiveness (SE) lower than −50 dB.

Preparation and electrical conductivity of (Zr, Hf, Pr, Y, La) O high entropy fluorite oxides

2022 ◽  
Vol 105 ◽  
pp. 122-130
Author(s):  
Fengnian Zhang ◽  
Fuhao Cheng ◽  
Chufei Cheng ◽  
Meng Guo ◽  
Yufeng Liu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
High Entropy

Pressure effects on electronic structure and electrical conductivity of TiZrHfNb high-entropy alloy

2022 ◽  
Vol 140 ◽  
pp. 107394
Author(s):  
S.A. Uporov ◽  
R.E. Ryltsev ◽  
V.A. Sidorov ◽  
S. Kh Estemirova ◽  
E.V. Sterkhov ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Electronic Structure ◽  
Pressure Effects ◽  
High Entropy Alloy ◽  
High Entropy

Wetting of Low Carbon Steel by High-Entropy Melts CuSnBiPbGa, CuSnBiPbIn and CuSnBiInCd and Formed Structure of Diffusion Layers

2020 ◽  
Vol 299 ◽  
pp. 887-892
Author(s):  
Olga Chikova ◽  
Irina Brodova ◽  
Vladimir S. Tsepelev ◽  
Ksenya Yu. Shmakova
Keyword(s):  
Carbon Steel ◽  
Liquid Alloy ◽  
Protective Coatings ◽  
Low Carbon Steel ◽  
Spreading Rate ◽  
Liquid Alloys ◽  
Equiatomic Composition ◽  
Low Carbon ◽  
High Entropy ◽  
Diffusion Layers

We present a result of a study of reactive wetting of surface of low carbon steel by liquid alloys CuSnBiPbGa, CuSnBiPbIn and CuSnBiInCd of equiatomic composition. Dependences of contact angle and spot diameter of wetted surface on temperature and time were studied. Liquid alloy CuSnBiPbGa begins wetting of surface of steel at 900 °C; spreading rate at higher temperatures increased by 8 times. Liquid alloy CuSnBiPbIn begins wetting surface of steel at 780°C, but spreading speed is almost unchanged with the further increase in temperature. Liquid alloy CuSnBiInCd begins wetting of surface of steel at a temperature of 570°C, and spreading is in a flash in nature. We studied microstructure and chemical composition of diffusion layers, formed at the spreading of liquid alloys of equiatomic composition CuSnBiPbGa, CuSnBiPbIn and CuSnBiInCd on steel surface. In all experiments at boundary with substrate a ductile transition layer of a solid solution of iron-based is formed. The thickness of diffusion layer side depends on the alloy composition. The widest diffusion layers formed for alloy CuSnBiInCd, and the most narrow - for alloy CuSnBiPbGa. We detected in segregations of copper and gallium atoms for bimetallic sample "CuSnBiPbGa+steel", of copper and tin atoms for samples "CuSnBiPbIn+steel" and "CuSnBiInCd+steel" in diffusion layers. The results of these studies have significance for the design of soldering technology and application of protective coatings on steel products.

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