Study of electrical and dielectric properties of Y₂O₃ doped Ba_{1 鈭?#xa0;x}(Bi_0.5Na_0.5)_xTiO₃ ceramics

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• 作者：Haidong Wu ; ^{wuhd200577@126.com} ; Yongping Pu ; Zhuo Wang ; Kai Chen
• 关键词：BaTiO3 ceramics ; Ferroelectric ; Dielectric ; Impedance ; Perovskites
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：1 June, 2012
• 卷：76
• 期：Complete
• 页码：222-225
• 文件大小：674 K

摘要

Y₂O₃-doped Ba_{1 鈭?#xA0;x}(Bi_0.5Na_0.5)_xTiO₃ ceramics were prepared by a conventional mixed oxide method. The XRD results showed that the phase compositions of all samples were pure tetragonal phases and the tetragonality c/a of the perovskite lattice varied with the Y₂O₃ and NBT contents. In order to study the electrical properties of (1-y)Ba_{1 鈭?#xA0;x}(Bi_0.5Na_0.5)_xTiO₃-yY₂O₃ ceramics, we used the Cole-Cole plot, that is, the graphic of Y鈥?versus Y鈥? The results showed that a single semicircular arc appeared and its radii of curvature firstly decreased and then increased with the increase of NBT and Y₂O₃ contents. In addition, the relative permittivity and dielectric loss versus frequency were characterized in the frequency range of 100 Hz-2 MHz. It can be found that relative permittivity and dielectric loss regularly changed with the increase of Y₂O₃ and NBT contents.