Preparation and electrical conductivity of (Zr, Hf, Pr, Y, La) O high entropy fluorite oxides

被引：35

作者：

Zhang, Fengnian ^{[1
]}

Cheng, Fuhao ^{[1
]}

Cheng, Chufei ^{[1
]}

Guo, Meng ^{[1
]}

Liu, Yufeng ^{[1
]}

Miao, Yang ^{[1
]}

Gao, Feng ^{[1
]}

Wang, Xiaomin ^{[1
]}

机构：

[1] Taiyuan Univ Technol, Coll Mat Sci & Engn, Taiyuan 030024, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2022年 / 105卷

基金：

中国国家自然科学基金;

关键词：

High-entropy ceramic; Fluorite structure; Electrical conductivity; Cation-size difference; STABILIZED ZIRCONIA; MECHANOCHEMICAL SYNTHESIS; DEFECT STRUCTURE; X-RAY; CERIA; RAMAN;

D O I：

10.1016/j.jmst.2021.07.028

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A series of compositionally complex fluorite oxides (CCFOs) were prepared by ball milling the mixture of ZrO2, HfO2, Y2O3, La2O3, and Pr6O11 followed by conventional solid-state sintering. Both XRD and TG-DSC results demonstrated that single-phase (Zr0.2Hf0.2Pr0.2Y0.2La0.2)O2-delta was formed at 1400 degrees C. Elements in bulk ceramic were uniformly distributed without evident accumulation according to SEM-EDS pictures. TEM results revealed that polycrystalline ceramic powder was assignable to cubic Fm-3m fluorite structure. The electrical conductivity (sigma) was measured via EIS technology and activation energy (E-a) of CCFOs was calculated in Arrhenius plots. In the temperature range of 300-750 degrees C, CCFOs preserved the same conduction mechanism and (Zr0.1667Hf0.1667Pr0.1667Y0.25La0.25)O2-delta possessed higher sigma and lower E-a than other high entropy fluorite oxides which is related to the incorporation of Pr element or the connection of cation-V-o complex. (C) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

引用

页码：122 / 130

页数：9

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