Abstract
Yttria coated silica nano-particles were fabricated by a sol-gel method, and the yttria-silica adding effect for BaTiO3 on a dielectric property was investigated. The sizes of mono-dispersed silica particles prepared were 20nm and 50nm, and these silica particles were coated with the yttria thin layer using yttrium nitrate aqueous solution. Yttria coated silica particles were successfully obtained in sizes of 29nm and 84nm. These yttria-silica particles were mixed with commercial BaTiO3 powder, and a sintered pellet was synthesized by a conventional sintering method in order to measure the dielectric property. The dielectric anomalies were suppressed for the specimen using the 29nm yttria-silica particles, but they were intact for the specimen using the 84nm yttria-silica particles.
