Effect of B-site dopants Nb, Ta and W on microstructure and electrical properties of Ca sub(0.85)(Li, Ce) sub(0.075)Bi sub(4)Ti sub(4)O sub(15)-0.01MnCO sub(3) 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: 01.01.2016
• Subjects: Ceramics; Dielectric properties; Electrical properties; Microstructure; Niobium; Piezoelectricity; Tantalum oxides; Tungsten oxides
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-015-3834-1

(Li, Ce) and Mn modified CaBi sub(4)Ti sub(4)O sub(15) (CBT) based ceramics were prepared by the solid state route, and were substituted by the equimolar ions of Nb super(5+), Ta super(5+) and W super(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 sub(2)O sub(5), Ta sub(2)O sub(5) and WO sub(3) into CBT-based ceramics were found to affect the electrical properties and temperature stability of the ceramics. Compared with Ta sub(2)O sub(5) and WO sub(3), the Nb-substitued ceramics exhibited the optimum piezoelectric property and dielectric property (d sub(33) ~ 19.6 pC/N, epsilon sub(r) ~ 123.7 and tan delta ~ 0.1 %) among all of these samples, together with a high Curie-temperature (T sub(C) ~ 767.6 degree C). Thermally activated depolarization behavior also demonstrated that the Nb super(5+) doped CBT-based ceramics possess outstanding thermal stability of piezoelectric properties. These results indicated that Nb sub(2)O sub(5) has a substantial effect on the structure and properties of CBT-based ceramics compared to Ta sub(2)O sub(5) and WO sub(3).