Ba and Mg co-doping to suppress high-temperature dielectric loss in lead-free Na0.5Bi0.5TiO3-based systems. Issue 3 (March 2020)

• Record Type: Journal Article
• Authors: Qiao, Yulong; Li, Weili; Zhang, Yulei; Jing, Lu; Yang, Xinrui; Gao, Chang; Cao, Wenping; Fei, Weidong
• Is Part Of: Journal of the European Ceramic Society. Volume 40:Issue 3(2020)
• Page Start: 720
• Page End: 727
• Publication Date: 2020-03
• Subjects: High-temperature dielectric loss -- Co-doping -- Oxygen ion conduction; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2019.11.029
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: In this study, Ba, Mg co-doped BNT-based ferroelectric ceramic (Ba0.2 Na0.3 Bi0.5 )Ti0.9 Mg0.1 O3 is fabricated by conventional solid-state reaction to obtain high-temperature dielectric performance. The temperature dependent dielectric constant and dielectric loss are investigated to understand the high-temperature dielectric behavior of the ceramic. The results show that Ba, Mg co-doped BNT ceramic has a very low dielectric loss (about 0.006–0.023) in a wide temperature range of 200–400 °C with dielectric constant about 3200–3800. The complex impedance plots, temperature dependent conductivity and first principle results reveal that the low dielectric loss at high-temperature is mainly due to the Ba doping increases the migration barrier energy of oxygen ions in BNT. The oxygen ion conduction of BNT-based ceramics is restrained, so that the dielectric loss reduces significantly. The study provides a new BNT-based material with low dielectric loss and temperature- stable dielectric constant in a wide temperature range which has great value of high-temperature applications.