| $BaTiO_3$의 강유전-상유전 상전이에 미치는 A($Cu_{1/3}Nb_{2/3}$)$O_3$ (A=Pb, Ba 및 Sr)의 영향 |
| 박휴범, 김정1, 김시중 |
고려대학교 이과대학 화학과
1서남대학 화학과 |
| Influences of A($Cu_{1/3}Nb_{2/3}$)$O_3$(A=Pb, Ba and Sr) on the Ferroelectric Paraelectric Phase Transition of $BaTiO_3$ Ceramics |
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| ABSTRACT |
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The influences of A(Cu1/3Nb2/3)O3(A=Pb, Ba and Sr) on the ferroelectric-paraelectric phase transition of BaTiO3 ceramics has been investigated. The tetragonality of crystal structure decreased with increasing A(Cu1/3Nb2/3)O3 content at room temperature. A linear correlation between Curie point and the tetragonality of lattice was not observed. In all three systems the variation of Curie point with the mole fraction showed similar tendency that the Curie point decreased at lower mole fraction but gradually increased in the region of higher mole fractions, Diffuse phase transitions were observed at higher mole fractions. The variation of Curie points could be explained by internal stress and Jahn-Teller distortion of BO6 due to Cu2+, and it was thought that the diffuse character of phase transition was caused by compositional fluctuation. |
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