Dielectric behaviors and relaxor characteristics in Bi0.5Na0.5TiO3-BaTiO3 ceramics

• Main Authors: Pei Chen, Jun Wang, Weidong Zeng, Changrong Zhou, Yongsheng Zhang, Qingning Li, Jiwen Xu, Guohua Chen, Changlai Yuan
• Format: Article
• Language: English
• Published: World Scientific Publishing 2019-10-01
• Series: Journal of Advanced Dielectrics
• Subjects: bismuth sodium titanate; dielectric relaxor; vogel–fulcher law; dielectric tunability
• Online Access: http://www.worldscientific.com/doi/pdf/10.1142/S2010135X19500383
• ISSN: 2010-135X; 2010-1368

Microstructure and dielectric behaviors of heating/cooling and bias-field were investigated in lead-free ceramics (1−x)Bi0.5Na0.5TiO3−xBaTiO3 (BNT−xBT, x=0, 0.02, 0.04, 0.06, 0.08 and 0.10). The relaxor characters and the Vogel–Fulcher law of frequency-dependent dielectric properties were analyzed. Three dielectric anomalies with pronounced frequency dispersion at Td, a maximum dielectric with variable frequency-dispersion at Tm and a third Maxwell–Wagner-type relaxation over a wide temperature range in high-temperature region were observed. The significant dielectric thermal hysteresis, low barrier energy, high freezing temperature in heating process and the maximum dielectric tunability appeared in x=0.4 ceramic.