Enhanced ferroelectricity in relaxor 0.7BiFeO3-0.3(Ba0.85Ca0.15)TiO3 ceramics using ball milling technique

• Published in: Journal of materials science. Materials in electronics Vol. 30; no. 22; pp. 20221 - 20228
• Main Authors: Shu, Mingfang, Huang, Wenjuan, Qin, Yanfeng, Wang, Dong, Li, Sumei, Yin, Lihua, Song, Wenhai, Yang, Jie, Zhu, Xuebin, Sun, Yuping
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.11.2019
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Materials Science; Optical and Electronic Materials
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-019-02406-6

0.7BiFeO 3 - 0.3 ( Ba 0.85 Ca 0.15 ) TiO 3 (BF–BCT) ceramics were synthesized with a conventional solid-state reaction method. The electrical properties of the BF–BCT ceramics depend on the milling time via a planetary ball-milling technique. The results show that the sample prepared by milling for 40 h possesses a rather large remanent polarization of 52 μ C / cm 2 and this value is superior to that of Non-Pb BF-based ceramics at room temperature. Moreover, the values of remanent polarization were confirmed by a PUND measurement to eliminate the contribution of leakage current. We attributed the large remanent polarization to the decrease in oxygen vacancies confirmed by X-ray photoelectron spectroscopy results. Moreover, the BF–BCT ceramics exhibit the dielectric relaxation process caused by the diffusion of oxygen vacancies inside ceramics.