(Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high-entropy ceramics with low thermal conductivity

Xueliang Yan, Loic Constantin, Yongfeng Lu, Jean François Silvain, Michael Nastasi, Bai Cui

Research output: Contribution to journalArticle

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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.

LanguageEnglish (US)
Pages4486-4491
Number of pages6
JournalJournal of the American Ceramic Society
Volume101
Issue number10
DOIs
StatePublished - Oct 1 2018

Fingerprint

rock salt
thermal conductivity
ceramics
entropy
Carbides
anion
Thermal conductivity
Entropy
Anions
elastic modulus
Negative ions
Salts
argon
Rocks
diffusivity
hardness
Phonon scattering
conductivity
Spark plasma sintering
Argon

Keywords

  • high-entropy ceramics
  • microstructure
  • spark plasma sintering
  • thermal conductivity

ASJC Scopus subject areas

  • Ceramics and Composites
  • Geology
  • Geochemistry and Petrology
  • Materials Chemistry

Cite this

(Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high-entropy ceramics with low thermal conductivity. / Yan, Xueliang; Constantin, Loic; Lu, Yongfeng; Silvain, Jean François; Nastasi, Michael; Cui, Bai.

In: Journal of the American Ceramic Society, Vol. 101, No. 10, 01.10.2018, p. 4486-4491.

Research output: Contribution to journalArticle

Yan, Xueliang ; Constantin, Loic ; Lu, Yongfeng ; Silvain, Jean François ; Nastasi, Michael ; Cui, Bai. / (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high-entropy ceramics with low thermal conductivity. In: Journal of the American Ceramic Society. 2018 ; Vol. 101, No. 10. pp. 4486-4491.
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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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AU - Constantin, Loic

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AU - Silvain, Jean François

AU - Nastasi, Michael

AU - Cui, Bai

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N2 - 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.

AB - 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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