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首页> 外文期刊>Materials Science and Engineering >Correlating structure, dielectric and impedance studies with lanthanum-ion substitution in bismuth titanate
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Correlating structure, dielectric and impedance studies with lanthanum-ion substitution in bismuth titanate

机译：钛酸铋中镧离子取代的结构，介电常数和阻抗研究

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摘要

A correlated study involving structure analysis, temperature dependence of dielectric functions and the complex impedance spectroscopy analysis was carried out in lanthanum modified bismuth titanate (BT, Bi_(4-x)La_xTi_3O_12; x=0,0.75) ceramics. A series addition of three RQcircuits has been shown to remarkably fit the complex impedance data for both x =0 and 0.75 samples, which were attributed to crystalline layer, plate boundary and grain boundary microelements. Temperature dependence DC-conductance of these microelements has revealed that lanthanum-ion substitution is mainly taking place in the perovskite blocks, which also led to decrease in orthorhombic splitting. This site preferred substitution was also consistent with shift in the oxygen ion-jump relaxation peak in the temperature dependence of the dissipation factor study.
机译：在镧改性钛酸铋（BT，Bi_（4-x）La_xTi_3O_12； x = 0,0.75）陶瓷中进行了涉及结构分析，介电功能的温度依赖性和复阻抗谱分析的相关研究。已显示三个RQ电路的串联添加可以显着拟合x = 0和0.75样品的复阻抗数据，这归因于晶体层，板边界和晶界微元素。这些微量元素的温度依赖性直流电导表明，镧离子取代主要发生在钙钛矿块中，这也导致正交晶分裂减少。在耗散因子研究的温度依赖性中，该位点优选的取代也与氧离子跳跃弛豫峰的移动一致。

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