Temperature stability of lead-free BST-BZN relaxor ferroelectric ceramics for energy storage capacitors

Autor: Jingsong Liu, Zhu Qing, Xiaoyan Zhong, Mengshi Zeng, Jun Li, Huiqin Li, Zifeng He, Lulu Zhou
Rok vydání: 2020
Předmět:
Zdroj: Journal of Materials Science: Materials in Electronics. 32:752-763
ISSN: 1573-482X
0957-4522
DOI: 10.1007/s10854-020-04854-x
Popis: Low sintering temperature and good temperature stability are the crucial parameters for the actual application of the dielectric capacitors. In this work, lead-free relaxor ferroelectric ceramics with chemical formula (1 − x)(Ba0.4Sr0.6)TiO3-xBi(Zn2/3Nb1/3)O3 [(1 − x)BST-xBZN, (x = 0.00 to 0.225)] were developed through a solid-state synthesis route. The microstructures, dielectric performance, and temperature stability were studied in detail. The results show that 0.775BST-0.225BZN bulk ceramic with capacitance-temperature dependence satisfied with X8R specification can be obtained at a sintering temperature of 1140 °C. In addition, the energy storage performance of 0.775BST-0.225BZN bulk ceramic exhibits good temperature stability in a wide range of temperatures from 25 to 150 °C. High dispersion results in capacitance-temperature stability and energy storage stability. More importantly, the 0.775BST-0.225BZN ceramic also displays good charge–discharge performance dependence on temperatures (variations of the current density and power density are less than 3% over 25–150 °C). These results demonstrate that 0.775BST-0.225BZN lead-free ceramic is a potential material for dielectric capacitors that can be operated in a wide range of temperatures.
Databáze: OpenAIRE
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