1. Piezoelectricity and Thermophysical Properties of Ba 0.90 Ca 0.10 Ti 0.96 Zr 0.04 O 3 Ceramics Modified with Amphoteric Nd 3+ and Y 3+ Dopants.
- Author
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Tian, Yongshang, Ma, Mingyang, Li, Shuiyun, Dong, Junli, Ji, Xiang, Wu, Haitao, Wang, Jinshuang, and Jing, Qiangshan
- Subjects
THERMOPHYSICAL properties ,PIEZOELECTRICITY ,CERAMICS ,PIEZOELECTRIC ceramics ,BARIUM titanate - Abstract
Lead-free barium calcium titanate zirconate (BCTZ) ceramics doped with a single rare-earth element generally exhibit excellent piezoelectric properties. However, their electrical properties deteriorate at an excessive dopant content, limiting their application. In this study, amphoteric neodymium (Nd
3+ ) and yttrium (Y3+ )-codoped BCTZ-NYx ceramics were synthesized via a solid-state reaction at 1240 °C. The influences of the Y3+ content (x) on the structural features, electrical properties, mechanical properties, and thermophysical properties were investigated. At a small x (<0.18 mol%), Y3+ could enhance the fracture strength and electrical properties by eliminating oxygen vacancies, defect dipoles, and/or structural defects. However, the outstanding performance deteriorated with excessive x. Additionally, the mechanism of the defect chemistry at different x was deduced. At an yttrium content of 0.18 mol%, the ceramic exhibited high piezoelectricity and ferroelectricity with low domain-switching activation energy (Ea = 0.401 eV), indicating that it could replace commercial lead-based piezoelectric ceramics. [ABSTRACT FROM AUTHOR]- Published
- 2023
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