The Effects of TiO$_2$Addition on the PTC Properties of BaTiO$_3$

BaTiO$_3$계의 PTC 특성에 미치는 TiO$_2$첨가량의 영향

We have investigated the influence of Ti/Ba mole ratio in the characteristics of the modified BaTiO$_3$systems with Ca addition. The specimens were fabricated with variations in Ti/Ba mole ratio between 0.995 and 1.01, and sintered in the temperature range between 13$25^{\circ}C$ and 1375$^{\circ}C$. The room temperature resistivity, PTCR effect and ac complex impedence characteristics were studied. It shows that the room temperature resistivity was increased with the increasing Ti/Ba mole ratio and sintering temperature. It was suggested that this result was mainly attributed to its grain-boundary properties