PTC Effect and Elementary Distribution near the Grain Boundary in a BaTiO3 Semiconductor

Hidenobu KONDOH, Junzo TANAKA, Hajime HANEDA, Shin-ichi SHIRASAKI
1989 Journal of the Ceramic Society of Japan  
The elementary distribution near the grain boundary and the oxygen diffusion in semiconducting barium titanate ceramics were investigated. Auger electron spectroscopy detected a Ba-O rich layer at grain boundaries . Measurement of the volume diffusion coefficient in barium titanate ceramics , suggested that the dissociation of oxygen at a high temperature is surpressed in a Ba-O rich layer. The relationship between a Ba-O rich layer at the grain boundary and the PTC effect was discussed .
doi:10.2109/jcersj.97.1245 fatcat:whmjcaz5jjdonohotegeljmb7y