期刊
CERAMICS INTERNATIONAL
卷 42, 期 3, 页码 4268-4273出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2015.11.103
关键词
Bismuth layer-structured ferroelectrics; Aurivillius type; Sodium bismuth titanate; Piezoelectric ceramics
资金
- National Natural Science Foundation of China [51172129, 50902087]
- Natural Science Foundation of Shandong Province of China [ZR2012EMQ005, ZR2014EMM012]
- Australian Research Council (ARC) [DP110100618]
- ARC Future Fellowships Program
- [2015JMRH0103]
Lightly cobalt-modified, Aurivillius-type, sodium bismuth titanate (Na0.5Bi4.5Ti4O15, NBT) ceramics were synthesized by substituting a small amount of cobalt ions onto the Ti4+ sites using conventional solid-state reaction. X-ray photoelectron spectroscopy (XPS) analysis coupled with bond valence sum calculations show that the dopant cobalt ions substitute for Ti4+ ions in the form of Co3+. The resultant cobalt-modified NBT ceramics (NBT-Co) exhibit better piezoelectric and electromechanical properties by comparison with pure NBT. With only 0.3 wt% Co3+ substitution, the piezoelectric properties of the NBT-Co ceramics are optimal, exhibiting a high piezoelectric coefficient (d(33)similar to 33 pC/N), a low dielectric loss tan 3 (similar to 0.1% at 1 kHz), a high thickness planar coupling coefficient (k(t)similar to 34%) as well as a high Curie temperature (Tc similar to 663 degrees C). Such NBT-Co ceramics exhibit nearly temperature-independent piezoelectric and electromechanical properties up to 400 degrees C, suggesting that these cobalt-modified NBT ceramics are promising materials for high temperature piezoelectric applications. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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