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Effect of SiO2 additives on the microstructure and energy storage density of SrTiO3 ceramics
Guanghui Zhao,Yiqiu Li,Hanxing Liu,Jing Xu,Hua Hao,Minghe Cao,Zhiyong Yu 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.3
The compositions of (1-x) SrTiO3-x SiO2 were prepared by a solid-state reaction. The crystalline structure, microstructure and energy storage performance were studied for the purpose of a potential application in high energy density capacitors. Fine grains with an average size of about 400 nm were obtained by adding SiO2 to SrTiO3 ceramics, which leads to a great enhancement in the breakdown performance of the samples. For SiO2-added samples, the notable increase in breakdown strength makes an obvious increase in energy storage density. With 15 vol.% addition, the sample exhibited an average breakdown strength of 36.1 kV/mm, and an energy storage density of 1.155 J/cm3.
Preparation and property of submicrometre-crystalline Ba0.67Sr0.33TiO3 powders and ceramics
Hanxing Liu,Jing Xu,Bo He,Yiqiu Li,Minghe Cao,Hua Hao,Zhiyong Yu 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.3
Submicrometre-particulate pure Ba0.67Sr0.33TiO3 (BST) powders approximately 110 nm in size have been prepared by a solidstate reaction technique. BST ceramics derived from powder calcined at different temperatures were fabricated with various sintering conditions. High-density BST ceramics at all sintering temperatures were obtained at a calcination temperature of 950 oC with the highest 99.6% of the theoretical density. Calcining at 950 oC and sintering at 1300 oC for 2 h , BST ceramic samples with an average grain size about 250 nm were obtained, showing satisfying dielectric properties and ferroelectric properties, with high permittivity εr = 7676, low loss factor tanδ = 0.01 and remanent polarization Pr = 9.2 μC/cm2, coercive electric field Ec = 1.58 kV/cm at room temperature.