(Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C highentropy ceramics with low thermal conductivity Academic Article uri icon

abstract

  • AbstractA novel highentropy carbide ceramic, (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C, with a singlephase rock salt structure, was synthesized by spark plasma sintering. Xray diffraction confirmed the formation of a singlephase rock salt structure at 261140C 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.

published proceedings

  • Journal of the American Ceramic Society

altmetric score

  • 3

author list (cited authors)

  • Yan, X., Constantin, L., Lu, Y., Silvain, J., Nastasi, M., & Cui, B.

citation count

  • 401

publication date

  • October 2018

publisher