BaSnO3 powders used to be prepared in solid-state reaction of BaCO3 and SnO2 at high temperature exceeding 1300 C. However, these powders contained impurities and were coarse grained [6]. Therefore, various wet chemical syntheses such as hydrothermal method [7], solegel method [6], and polymerized complex method [8] have been recently adjusted and applied for the preparation of the fine BaSnO3 powders.