Ferroelectric relaxor properties of (1聽鈭捖?span style='font-style: italic'>x)K_0.5Na_0.5NbO₃-xBa_0.5Ca_0.5TiO₃ ceramics

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• 作者：C.-W. Cho^a ; M.R. Cha^a ; J.Y. Jang^a ; S.H. Lee^a ; D.J. Kim^a ; S. Park^a ; ^{psk@pusan.ac.kr} ; J.S. Bae^b ; S.D. Bu^c ; S. Lee^d ; J. Huh^e
• 关键词：Relaxor ferroelectric ; Dielectric constant ; X-ray diffraction
• 刊名：Current Applied Physics
• 出版年：2012
• 期刊代码：15_15671739
• 类别：ph
• 出版时间：September, 2012
• 卷：12
• 期：5
• 页码：1266-1271
• 文件大小：1104 K

摘要

The Ba_0.5Ca_0.5TiO₃ (BCT) composition dependent dielectric and structural properties of (1鈭?em>x)K_0.5Na_0.5NbO₃-xBa_0.5Ca_0.5TiO₃ powders were investigated. Room temperature x-ray diffraction revealed the powder structure to transform from orthorhombic to cubic with increasing BCT composition. The frequency dependent dielectric constant measurements revealed a shift in the temperature of the maximum dielectric constant for at frequencies, suggesting that the system exhibits ferroelectric relaxor behavior. The system containing 15%BCT showed the closest calculated Curie-Weiss exponent to 2, which the exponent for a relaxor ferroelectric.