High capacitance-temperature sensitivity and giant dielectric constant in SrTiO3
High capacitance-temperature sensitivity and giant dielectric constant in SrTiO3
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DOI：
10.1063/1.2736298
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发表时间：
2007-05
影响因子：
4
通讯作者：
C. Ang;Z. Yu
中科院分区：
文献类型：
--
作者：
C. Ang;Z. Yu
在还原气氛中退火的Bi掺杂SrTiO3陶瓷中，观察到低频时具有“巨大”介电常数（e ~ 104）和高频（>1MHz）时剩余的高e（~ 5×103）背景的介电弛豫。该材料在~ 2K时具有非常高的电容温度灵敏度，远远高于当前文献报道的值。在复阻抗谱研究的基础上，将低频下的巨大介电常数归因于“麦克斯韦-瓦格纳”界面极化。高频处剩余的高介电常数暂定归因于“电子-弛豫模式”耦合极化。
A dielectric relaxation with a “giant” dielectric constant (e∼104) at low frequencies and a remaining high e(∼5×103) background at high frequencies (>1MHz) are observed in Bi doped SrTiO3 ceramics annealed in a reduced atmosphere. The material possesses a very high capacitance-temperature sensitivity at ∼2K, which is much higher than the values reported in the current literature. The giant dielectric constant at low frequencies is attributed to the “Maxwell-Wagner” interfacial polarization based on the study of the complex-impedance spectrum. The remaining high dielectric constant at high frequencies is tentatively attributed to the “electron-relaxation mode” coupling polarization.