(Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high‐entropy ceramics with low thermal conductivity |
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| Authors: | Xueliang Yan Loic Constantin Yongfeng Lu Jean‐François Silvain Michael Nastasi Bai Cui |
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| Affiliation: | 1. Department of Mechanical & Materials Engineering, University of Nebraska‐Lincoln, Lincoln, Nebraska;2. Department of Electrical Engineering, University of Nebraska‐ Lincoln, Lincoln, Nebraska;3. Institut de Chimie de la Matière Condensée de Bordeaux ‐ ICMCB‐CNRS 87, Pessac Cedex, France;4. Nebraska Center for Energy Sciences Research, University of Nebraska‐Lincoln, Lincoln, Nebraska;5. Nebraska Center for Materials and Nanoscience, University of Nebraska‐Lincoln, Lincoln, Nebraska |
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| Abstract: | A novel high‐entropy carbide ceramic, (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C, with a single‐phase rock salt structure, was synthesized by spark plasma sintering. X‐ray diffraction confirmed the formation of a single‐phase rock salt structure at 26‐1140°C in Argon atmosphere, in which the 5 metal elements may share a cation position while the C element occupies the anion position. (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C exhibits a much lower thermal diffusivity and conductivity than the binary carbides HfC, ZrC, TaC, and TiC, which may result from the significant phonon scattering at its distorted anion sublattice. (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C inherits the high elastic modulus and hardness of the binary carbide ceramics. |
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| Keywords: | high‐entropy ceramics microstructure spark plasma sintering thermal conductivity |
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