Title :
Influence of TiO2 excess on the sintering behavior and abnormal grain growth of barium titanate ceramics
Author :
Jong-Sun Cho ; Kim, Ho Gi
Author_Institution :
Dept. of Mater. Sci. & Eng., Korea Adv. Inst. of Sci. & Technol., Seoul, South Korea
Abstract :
The sintering behavior and abnormal grain growth of BaTiO3 with TiO2 excess were investigated. The BaTiO3 powders used in this study were prepared by conventional calcination of BaCO3 and TiO2. The contents of TiO 2 excess were varied from 0.5 to 3 mol.%. The onset temperatures of the sintering (initial state sintering-3% shrinkage) were lowered with increasing amounts of TiO2 excess. The rates of densification with increasing amounts of TiO2 were considerably faster than those of stoichiometric BaTiO3. Grain growth was inhibited with increasing TiO2 excess. The inhibition of grain growth caused abnormal grain growth due to the inhomogeneous distribution of a Ti-rich second phase. Abnormally grown grain shapes were changed with TiO2 excess
Keywords :
barium compounds; ceramics; sintering; titanium compounds; BaTiO3 ceramic sintering; BaTiO3-TiO2; TiO2 excess influence; abnormal grain growth; calcination; grain growth inhibition; grain shapes; rates of densification; shrinkage; sintering behavior; sintering onset temperature; Barium; Calcination; Ceramics; Crystallization; Optical microscopy; Optical recording; Powders; Scanning electron microscopy; Shape; Temperature;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1991., Proceedings of the 3rd International Conference on
Conference_Location :
Tokyo
Print_ISBN :
0-87942-568-7
DOI :
10.1109/ICPADM.1991.172213
