期刊
SCRIPTA MATERIALIA
卷 207, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2021.114273
关键词
High entropy ceramics; Zirconia; Structural properties; Optical properties; Reversible tuning
类别
资金
- Deutsche Forschungsgemeinschaft (DFG) [HA 1344/43-1]
- DAAD-IIT Master Sandwich program
- European Union's Horizon 2020 research and innovation program [730957, 101017709]
- Carl Zeiss Foundation
The stabilizing role of Zr in single-phase fluorite type high entropy oxides was demonstrated, showing its influence on phase composition and opto-electronic properties. The presence of specific cations allows for substantial band gap tuning.
Stabilizing role of Zr is shown in single-phase fluorite type high entropy oxides (F-HEOs). The irreversible crystallographic symmetry lowering from fluorite to bixbyite upon high temperature calcination observed in Ce based F-HEOs is suppressed in the Zr based F-HEOs. Furthermore, replacing Zr by Sn/Tb results in biphasic compositions, another feature that portrays the dominant role of Zr. Moreover, the presence of cations like Pr/Tb in the Zr-F-HEOs allows for a substantial and fully reversible tuning of the band gap within 2 eV <-> 4 eV. Essentially, the phase-purity of F-HEOs is retained irrespective of the variation in the opto-electronic characteristics. The absence of Pr/Tb results in a wide band gap of 5 eV. Thus, the study highlights that the roles of specific cations need to be critically considered, in addition to the synergistic or cocktail effects, to gain deeper insights into structure-property relations in chemically complex HEOs. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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