Effect of B-site dopants Nb, Ta and W on microstructure and electrical properties of Ca0.85(Li, Ce)0.075Bi4Ti4O15-0.01MnCO3 piezoelectric ceramics

• Published in: Journal of materials science. Materials in electronics Vol. 27; no. 1; pp. 913 - 920
• Main Authors: Xin, Deqiong, Peng, Zhihang, Huang, Fengkang, Chen, Qiang, Wu, Jiagang, Wang, Yadan, Yue, Xi, Xiao, Dingquan, Zhu, Jianguo
• Format: Journal Article
• Language: English
• Published: New York Springer US 2016
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Materials Science; Optical and Electronic Materials; Piezoelectric Coefficient; Piezoelectric Property; Dielectric Property; Dielectric Loss; Nb2O5
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-015-3834-1

(Li, Ce) and Mn modified CaBi 4 Ti 4 O 15 (CBT) based ceramics were prepared by the solid state route, and were substituted by the equimolar ions of Nb 5+ , Ta 5+ and W 6+ in the B-site. The variations of crystalline structure, microstructure, piezoelectric properties and dielectric properties were investigated. The XRD patterns indicated that all compositions formed a single bismuth layered-structural phase with m  = 4. The additions of Nb 2 O 5 , Ta 2 O 5 and WO 3 into CBT-based ceramics were found to affect the electrical properties and temperature stability of the ceramics. Compared with Ta 2 O 5 and WO 3 , the Nb-substitued ceramics exhibited the optimum piezoelectric property and dielectric property ( d 33  ~ 19.6 pC/N, ε r  ~ 123.7 and tan δ  ~ 0.1 %) among all of these samples, together with a high Curie-temperature ( T C  ~ 767.6 °C). Thermally activated depolarization behavior also demonstrated that the Nb 5+ doped CBT-based ceramics possess outstanding thermal stability of piezoelectric properties. These results indicated that Nb 2 O 5 has a substantial effect on the structure and properties of CBT-based ceramics compared to Ta 2 O 5 and WO 3 .