From high-entropy ceramics to compositionally-complex ceramics: A case study of fluorite oxides

Wright, Andrew J.; Wang, Qingyang; Huang, Chuying; Nieto, Andy; Chen, Renkun; Luo, Jian

doi:10.1016/j.jeurceramsoc.2020.01.015

Title: From high-entropy ceramics to compositionally-complex ceramics: A case study of fluorite oxides

Journal Article · 10 January 2020 · Journal of the European Ceramic Society

DOI: https://doi.org/10.1016/j.jeurceramsoc.2020.01.015 · OSTI ID:1835138

Wright, Andrew J. ^[1]; Wang, Qingyang ^[2]; Huang, Chuying ^[2];

^[3]; Chen, Renkun ^[2]; Luo, Jian ^[2]

Univ. of California, San Diego, CA (United States); UCSD
Univ. of California, San Diego, CA (United States)
Naval Postgraduate School, Monterey, CA (United States)

Using fluorite oxides as an example, this study broadens high-entropy ceramics (HECs) to compositionally-complex ceramics (CCCs) or multi-principal cation ceramics (MPCCs) to include medium-entropy and/or non-equimolar compositions. Here, nine compositions of compositionally-complex fluorite oxides (CCFOs) with the general formula of (Hf_1/3Zr_1/3Ce_1/3)_1-x(Y_1/2X_1/2)xO_2-δ (X = Yb, Ca, and Gd; x = 0.4, 0.148, and 0.058) are fabricated. The phase stability, mechanical properties, and thermal conductivities are measured. Compared with yttria-stabilized zirconia, these CCFOs exhibit increased cubic phase stability and reduced thermal conductivity, while retaining high Young’s modulus (~210 GPa) and nanohardness (~18 GPa). Moreover, the temperature-dependent thermal conductivity in the non-equimolar CCFOs shows an amorphous-like behavior. In comparison with their equimolar high-entropy counterparts, the medium-entropy non-equimolar CCFOs exhibit even lower thermal conductivity (k) while maintaining high modulus (E), thereby achieving higher E/k ratios. These results suggest a new direction to achieve thermally-insulative yet stiff CCCs (MPCCs) via exploring non-equimolar and/or medium-entropy compositions.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: US Department of the Navy, Office of Naval Research (ONR); USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: EE0008529

OSTI ID:: 1835138

Journal Information:: Journal of the European Ceramic Society, Journal Name: Journal of the European Ceramic Society Journal Issue: 5 Vol. 40; ISSN 0955-2219

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: From high-entropy ceramics to compositionally-complex ceramics: A case study of fluorite oxides

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