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J. Korean Ceram. Soc. > Volume 35(7); 1998 > Article
Journal of the Korean Ceramic Society 1998;35(7): 665.
PbO-TiO$_2$-B$_2$O$_3$-BaO 계에서 PbTiO$_3$ 결정의 상전이 특성에 대한 유리질상의 영향
이선우, 심광보1, 오근호1
한양대학교 신소재 공정 공학원
1한양대학교 세라믹공정 연구센터
Effect of Glassy Phases on the Ferroelectric Anomaly of PbTiO$_3$ in PbO-TiO$_2$-B$_2$O$_3$-BaO System
Ferroelectric anomaly in PbO-{{{{ { {B }_{2 }O }_{3 } }}-{{{{ {TiO }_{3 } }}-BaO glasses which is observed in DAT measurements was in-vestigated together with the effect of BaO content on the shift of Cuire temperature. The temperature where the ferroelectric anomaly apperars on cooling in DTA decreased in proportion with increasing BaO content,. For as-crystallized samples the ferroelectric anomaly was not observed on heating but on cooling whilist for powder samples leached chemically from the crystallized samples both endothermic and ex-otehrmic peaks were observed. This fact suggests that the appearance of the ferroelectric anomaly in DAT largely depends on glassy phases surrounding individual {{{{ {PbTiO }_{3 } }} crystals rather than effects of grain size and crystallinity.
Key words: Lead titanate, barium, Glass-ceramics, Transformation, Curie temperature, Ferroelectric anomaly, DTA
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