Control of Mesoscopic Particle Structure in Barium Titanate Nanoparticles and their Dielectric Properties

摘要

Barium titanate (BaTiO{sub}3) fine particles were prepared using the 2-step thermal decomposition method of barium titanyl oxalate. At the 2nd step of this method, the intermediate compound (Ba{sub}2Ti{sub}2O{sub}5·CO{sub}3) was decomposed into BaTiO{sub}3 and CO{sub}2 under various degrees of vacuum pressure. As a result, the particle size of prepared BaTiO{sub}3 nanoparticles decreased with decreasing pressure. Moreover, the dielectric constants of these BaTiO{sub}3 nanoparticles were measured using the powder dielectric measurement method using slurry. The dielectric constant of BaTiO{sub}3 nanoparticles increased with decreasing pressure at the same particle size. It is considered that mesoscopic particle structure controlled by vacuum pressure is important for the dielectric properties of BaTiO{sub}3 nanoparticles.