期刊
CERAMICS INTERNATIONAL
卷 46, 期 6, 页码 8122-8129出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.12.039
关键词
Intergrowth bismuth layered; Ceramic; Piezoelectric properties; Electrical conductivity; Oxygen vacancies
资金
- National Natural Science Foundation of China [51562014, 51762024, 51862016, 51602135]
- Natural Science Foundation of Jiangxi Province [20192BAB206008, 20171BAB216012, 20192BAB212002]
- Foundation of Jiangxi Provincial Education Department [GJJ180718, GJJ 180739]
In this work, BaBi8(Ti1-xTax)(7)O-27 (x = 0, 0.005, 0.01, 0.015, 0.02 and 0.03) intergrowth bismuth layer-structured ferroelectric ceramics (BLSFs) were prepared by traditional solid reaction method, and Ta5+ was designed to replace Ti-4(+) to regulate crystal structure and improve electrical properties. The results show that Ta5+ as a donor increases an orthogonal distortion, while reducing the concentration of oxygen vacancies in the ceramics. The results show that the structural distortion increases with Ta doping due to the larger radius of the Ta ion compared to that of the Ti ion. At the same time, proper Ta5+ doping as a donor can effectively inhibit the formation of oxygen vacancies, which reduces high temperature leakage, and can cause a sharp reduction of grain size. However, excessive Ta5+ doping also results in a serious structural distortion, and consequently a serious deterioration of electrical properties. BaBi8(Ti-0.995 Ta-0.005)(7)O-27 shows an optimal piezoelectric performance with a piezoelectric constant d(33) of 19 pC/N, which is twice as large as that of pure BaBi8Ti7O27 (similar to 8 pC/N), and verifies its possibility as a potential candidate material for high temperature piezoelectric field.
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