Fabrication of Monodisperse Ba0.80Sr0.20Zr0.10Ti0.90O3@mSiO2 Particles and Fine-Grained Ceramic with Mesoporous SiO2 Coating for Enhanced Energy Storage Properties

Monodisperse submicron Ba0.8Sr0.2Zr0.1Ti0.9O3 (BSZT) particles have been prepared using an aqueous phase method. Cetyltrimethylammonium bromide was used as a template and surfactant to achieve a mesoporous SiO2 shell coating on the surface of the BSZT particles via tetraethoxysilane hydrolysis, resulting in BSZT@mSiO2 particles (where “m” means “mesoporous”) with high dispersibility. A dense, fine-grained BSZT@mSiO2 energy-storage ceramic (with grain size ≤ 280 nm) was obtained by sintering in air at 1050°C for 2 h. The maximum dielectric constant and energy storage density of the BSZT@mSiO2 ceramics were 782 and 0.27 J/cm3, respectively, at room temperature. The mesoporous SiO2 shell of the BSZT@mSiO2 particles improved the dielectric constant and energy storage density of the ceramic compared with a non-mesoporous SiO2 shell. This method therefore represents an interesting approach for preparation of fine-grained energy storage ceramics.