High-frequency dielectric properties of BSTO ceramic prepared with hydrothermal synthesized SrTiO3 and BaTiO3 powders--颗粒学报PARTICUOLOGY

Xing, Y., Liang, H., Li, X., & Si, L. (2009). High-frequency dielectric properties of BSTO ceramic prepared with hydrothermal synthesized SrTiO3 and BaTiO3 powders. Particuology, 7(5), 414–418. https://doi.org/10.1016/j.partic.2009.03.011

High-frequency dielectric properties of BSTO ceramic prepared with hydrothermal synthesized SrTiO₃ and BaTiO₃ powders

Yonghui Xing ^a, Hui Liang ^a *, Xiaolei Li ^a, Liuqi Si ^b

a Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, China
b Shandong Sinocera Functional Material Co. Ltd., Shandong, Dongying 257091, China

10.1016/j.partic.2009.03.011

Volume 7, Issue 5, October 2009, Pages 414-418

Received 10 February 2009, Revised 16 March 2009, Accepted 21 March 2009, Available online 18 August 2009.

E-mail: lhtj@tju.edu.cn

Highlights

Abstract

BSTO dielectric ceramic was prepared from SrTiO₃ and BaTiO₃powders synthesized by hydrothermal method, as well as from Ba_0.6Sr_0.4TiO₃ powder synthesized by conventional solid-state reaction. The former can be sintered at a relatively low temperature of 1120 °C. Characterization by SEM showed that the grain shapes of both ceramics are cubical, though the grain size of the former is much smaller. Dielectric constants measured at 20 °C were shown to vary with frequency in the range from 1 kHz to 2 MHz and dc bias field, and further that the dielectric loss of the former to be less than 2 × 10⁻³ in the frequency range of 20 kHz to 1 MHz, much smaller than that of the latter sample. For the former, temperature dependence of dielectric constant is much flatter and there exists an extended phase transition diffusion covering a wide temperature range of Curie temperature T_c. The smaller grain size of the former depresses the dc bias electrical field dependence of dielectric constant. The tunability is 7% under a bias field of 0.6 kV/mm dc.

Graphical abstract

Keywords

Hydrothermal method; SrTiO₃; BaTiO₃; Dielectric properties

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