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铽改性铌酸锶钡晶体的介电性和热电性
Dielectric and pyroelectric properties of terbium modified barium stromtium niobate crystals
【摘要】 用铽改性SBN晶体能有效地改善晶体的性质。实验测量了铽改性Sr0.61Ba0.39Nb2O6晶体的电容率和热电系数。实部ε’r1和虚部ε’’r1分别在100K和55K附近有峰。电容率的温度系数TCεr3和TCεr1在55K附近都峰化。在90K以下,检测出犤100犦方向存在热电性。这些实验结果证明,该晶体存在低温铁电-铁电相变。
【Abstract】 The dielectric permittivity and pyroelectric coefficient of Tb -modif ied Sr 0.61Ba 0.39Nb2O6crystals were measured.There is a peak of the real partε’r1and the imaginary partε″r1around 100K and 55K respectively.And both the te mperature coefficients peaks of the permittivity,TCεr3and TCεr1,are around 55K.Below 90K,pyroelectricity is detected along thedirection.These experi -mental results evidence a low temperature ferroelectric -ferroelectric phase transition in these crystals.
【关键词】 介电性;
热电性;
铁电相变;
【Key words】 dielectric properties; pyroelectricity; ferroelectric phase transition;
【Key words】 dielectric properties; pyroelectricity; ferroelectric phase transition;
【基金】 国家自然科学基金资助(No.69777017)
- 【文献出处】 功能材料与器件学报 ,Journal of Functional Materials and Devices , 编辑部邮箱 ,2001年04期
- 【分类号】O73
- 【被引频次】7
- 【下载频次】91