Effects of lanthanide ions on the structure and electrical properties of Aurivillius Bi3TiNbO9 high temperature piezoelectric ceramics

Dingwei Hou, Huiqing Fan, Yanqin Chen, Yuxin Jia, Weijia Wang

科研成果: 期刊稿件文章同行评审

12 引用 (Scopus)

摘要

Aurivillius Bi3TiNbO9 has a very high Curie temperature (Tc), but the piezoelectric coefficient (d33) is very low, and the influence of ions with different radii on its performance is not clear. High temperature piezoelectric ceramics Bi2.99(Li0.5Ln0.5)0.01TiNbO9 (BTNO-1LiLn, Ln = La, Nd, Gd, and Er) were prepared by solid state reaction sintering, and its microstructure, piezoelectric properties and electrical conductivity were systematically studied. The Tc of BTNO-1LiLn increases with the decrease of Ln3+ ions radii. BTNO-1LiEr obtains the highest d33 of 10.6 pC/N. Considering the cation disorder of A-site and bismuth layer of calcium titanium layer in Aurivilius structure, the crystal structures of BTNO-1LiLa with special occupation and BTNO-1LiEr with the best performance are refined, and the source of spontaneous polarization (Ps) is analyzed. It is proved that different occupation will have different effects on the high temperature piezoelectric properties and fatigue cycle properties of BTNO based ceramics. Finally, the band structure of BTNO pure ceramic based on the first principle is calculated. By comparing the activation energy and band gap width, it is indicated that (Li0.5Ln0.5)2+ ions entering BTNO will form impurity energy levels and form p-type semiconductors. This study provides a theoretical basis for better performance of BTNO based high temperature piezoelectric ceramics.

源语言英语
文章编号166065
期刊Journal of Alloys and Compounds
921
DOI
出版状态已出版 - 15 11月 2022

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