ゾル-ゲル合成チタン酸バリウムゲルの熱的挙動

概要

論文の詳細を見る
Crystallization of barium titanate(BaTiO_3)during heat treatment from partially crystallized BaTiO_3 xerogels has been investigated. The xerogels were derived from hydrolysis of concentrated Ba-, Ti-alkoxides precursor solution(0.4 or 0.8×10^3 mol・m^<-3>). Different pathways to crystallization for BaTiO_3 from amorphous Ba-Ti-O remained in the xerogels were confirmed depending on the aging time before heat treatment. Amorphous Ba-Ti-O included in the xerogels with a short aging time crystallized in the range 570-700℃ by intermediary formation of an oxycarbonate phase, Ba_2Ti_2O_5CO_3CO_2. On the other hand, amorphous Ba-Ti-O remained after a long aging time crystallized into BaTiO_3 directly up to 600℃. Kinetics of BaTiO_3 formation during heat treatment and relations between thermal behavior and local structure of the gels in this sol-gel system are examined.
社団法人日本セラミックス協会の論文
1998-07-01