Field history dependence of nonlinear dielectric properties of Ba0.6Sr0.4TiO3 ceramics under bias electric field: Polarization behavior of polar nano-regions
Field history dependence of nonlinear dielectric properties of Ba0.6Sr0.4TiO3 ceramics under bias electric field: Polarization behavior of polar nano-regions
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偏置电场下 Ba0.6Sr0.4TiO3 陶瓷非线性介电性能的场史依赖性：极性纳米区域的极化行为
DOI：
10.1016/j.physb.2011.01.072
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发表时间：
2011-04
期刊：
影响因子：
--
通讯作者：
Xiao-Fei Zhang, Qing Xu*, Han-Xing Liu, et al
中科院分区：
文献类型：
--
作者：
Xiao-Fei Zhang, Qing Xu*, Han-Xing Liu, et al
Ba0的非线性介电特性。6 sr0。研究了偏置电场作用下柠檬酸法制备的4TiO3陶瓷的场历史。x射线衍射分析和介电常数εr的温度依赖性证实了试样在室温下的宏观准电态。在室温下，样品的极化-电场（PE）磁滞回线较细，表明存在叠加在准电背景上的极性纳米区（pnr）。连续偏置场扫描周期的非线性介电特性对场历史表现出很强的敏感性。这种现象定性地解释为pnr在偏置场下的不可逆极化演化。可调性随周期数的显著下降表明pnr对介电非线性有可观的贡献。通过将介电常数拟合到多极化机理模型中来确定pnr的极化和尺寸。
Nonlinear dielectric properties of Ba0. 6Sr0. 4TiO3 ceramics prepared by citrate method were investigated under bias electric field with respect to field history. X-ray diffraction analysis and temperature dependence of the dielectric constant (εr) confirmed a macroscopically paraelectric state for the specimen at room temperature. A slim polarization versus electric field (PE) hysteresis loop of the specimen at room temperature indicated the existence of polar nano-regions (PNRs) superimposed on the paraelectric background. The nonlinear dielectric properties in continuous cycles of bias field sweep displayed a strong sensitivity to the field history. This phenomenon was qualitatively explained in terms of an irreversible polarization evolution of the PNRs under the bias fields. A considerable decline of the tunability with the cycle number suggests an appreciable contribution of the PNRs to the dielectric nonlinearity. The polarization and size of the PNRs were determined by fitting the dielectric constants to a multipolarization mechanism model.
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影响因子：
5.7
作者：
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通讯作者：
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影响因子：
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DOI：
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发表时间：
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期刊：
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影响因子：
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作者：
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