A step forward from high-entropy ceramics to compositionally complex ceramics: a new perspective

Wright, Andrew J.; Luo, Jian

doi:10.1007/s10853-020-04583-w

A step forward from high-entropy ceramics to compositionally complex ceramics: a new perspective

Journal Article · Sat Mar 28 00:00:00 EDT 2020 · Journal of Materials Science

DOI:https://doi.org/10.1007/s10853-020-04583-w· OSTI ID:1835140

Wright, Andrew J. ^[1]; ^[2]

Univ. of California, San Diego, CA (United States); UCSD
Univ. of California, San Diego, CA (United States)

High-entropy ceramics (HECs) have quickly gained attention since 2015. To date, nearly all work has focused on five-component, equimolar compositions. This perspective article briefly reviews different families of HECs and selected properties. Following a couple of our most recent studies, we propose a step forward to expand HECs to compositionally-complex ceramics (CCCs) to include medium-entropy and/or non-equimolar compositions. Here, using defective fluorite and ordered pyrochlore oxides as two primary examples, we further consider the complexities of aliovalent cations and anion vacancies as well as ordered structures with two cation sublattices. Better thermally-insulating yet stiff CCCs have been found in non-equimolar compositions with optimal amounts of oxygen vacancies and in ordered pyrochlores with large size disorder; it is demonstrated that medium-entropy ceramics (MECs) can prevail over their high-entropy counterparts. The diversifying classes of CCCs provide even more possibilities than HECs to tailor the composition, defects, disorder/order, and consequently various properties.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: EE0008529; EE0008839

OSTI ID:: 1835140

Alternate ID(s):: OSTI ID: 1799526

Journal Information:: Journal of Materials Science, Journal Name: Journal of Materials Science Journal Issue: 23 Vol. 55; ISSN 0022-2461

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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High‐entropy transparent fluoride laser ceramics Chen, Xianqiang; Wu, Yiquan Journal of the American Ceramic Society, Vol. 103, Issue 2 https://doi.org/10.1111/jace.16842	journal	September 2019
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High-Entropy Alloys – A New Era of Exploitation Yeh, Jien Wei; Chen, Yu Liang; Lin, Su Jien Materials Science Forum, Vol. 560 https://doi.org/10.4028/www.scientific.net/MSF.560.1	journal	November 2007

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36 MATERIALS SCIENCE
Compositionally Complex ceramics
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A step forward from high-entropy ceramics to compositionally complex ceramics: a new perspective

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