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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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La2M0209系新型氧离子导体中氧空位扩散的内耗与介电弛豫研究
Keywords: 氧离子导体,固体氧化物燃料电池
Abstract:
报道了用内耗和介电弛豫方法研究新型氧离子导体La2-xAxMo2O9(其中，A=Ca，Bi，K；x=0-0.3)的最新结果，结果表明，在内耗-温度谱和介电损耗-温度谱上出现了两个与氧空位短程扩散有关的内耗峰和介电弛豫峰，说明氧空位扩散至少有两个不等同的弛豫过程．掺杂后，两弛豫峰都移向高温，氧空位的扩散激活能增加，高温弛豫峰高度降低而低温弛豫峰略有升高．在适当的掺杂条件下(30％Ca，5％Bi或5％K)，低温下的电导率都有不同程度的提高．根据实验结果和晶体结构提出了氧空位(或离子)扩散的物理图像．
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