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KNb1-xMgxO3-δ的高温高压合成及输运性质研究

DOI: 10.11858/gywlxb.2001.04.010, PP. 297-303

Keywords: KNb1-xMgxO3-&delta,高温高压,交流阻抗谱,离子电导

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Abstract:

采用高温高压法制备了KNb1-xMgxO3-δ(x=0.0~0.3)氧离子导电材料,使用XRD、TG-DTA及交流复阻抗谱对样品的结构和离子导电性进行了表征。实验结果表明,高压降低了合成温度,合成的KNb1-xMgxO3-δ系列固溶体与其母体KNbO3一样都为正交钙钛矿结构,晶胞参数随掺杂量的增加而略微增大。固溶体KNb1-xMgxO3-δ具有离子导电特征,通过拟合阻抗谱数据获得了该材料晶粒电导、晶界电导和体电导率与温度的关系。样品的晶界电阻较高,晶界效应十分明显,离子跳跃传导可能在其输运机制中占据主导地位。在x=0.1附近,电导率达到最大值,700℃时为1.2×10-3S·cm-1。

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