Title: Ba and Mg co-doping to suppress high-temperature dielectric loss in lead-free Na0.5Bi0.5TiO3-based systems
Abstract: In this study, Ba, Mg co-doped BNT-based ferroelectric ceramic (Ba0.2Na0.3Bi0.5)Ti0.9Mg0.1O3 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.
Publication Year: 2019
Publication Date: 2019-11-09
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 15
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