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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.
Reported the latest results of the new type of oxygen ion conductor La2-xAxMo2O9 (where A = Ca, Bi, K; x = 0-0.3) by means of internal dissipation and dielectric relaxation. The results show that, In the loss-temperature spectrum, there are two internal dissipation peaks and dielectric relaxation peaks related to oxygen vacancies in short-range diffusion, indicating that oxygen vacancy diffusion has at least two different relaxation processes. After doping, both relaxation peaks shift The diffusion activation energy increases to high temperature and oxygen vacancy, the peak height of high temperature relaxation decreases and the peak of low temperature relaxation increases slightly.Under the suitable doping conditions (30% Ca, 5% Bi or 5% K) The electrical conductivity of them all increased to some extent.According to the experimental results and the crystal structure, the physical image of oxygen vacancy (or ion) diffusion was proposed.