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Journal of Materials Science

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28-03-2020 | Review

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

Authors: Andrew J. Wright, Jian Luo

Published in: Journal of Materials Science | Issue 23/2020

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Abstract

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 non-equimolar compositions. 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 substantial size disorder. It is demonstrated that medium-entropy ceramics 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.

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Title: A step forward from high-entropy ceramics to compositionally complex ceramics: a new perspective
Authors: Andrew J. Wright
Jian Luo
Publication date: 28-03-2020
Publisher: Springer US
Published in: Journal of Materials Science / Issue 23/2020
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-020-04583-w

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