Effect of Li⁺ addition on crystal structure and electrical conduction of highly defective La_1/3NbO₃ perovskite

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• 作者：Kai-Yun Yang ; Kuan-Zong Fung
• 关键词：A. Ceramics ; A. Oxides ; D. Defects ; D. Electrical properties
• 刊名：Journal of Physics and Chemistry of Solids
• 出版年：2008
• 出版时间：February-March 2008
• 年：2008
• 卷：69
• 期：2-3
• 页码：393-399
• 全文大小：576 K

文摘

The Li⁺ solubility, crystal structure and electrical properties of the Li_3xLa_1/3−xNbO₃ solid solution with A-site deficient perovskite structure were examined using X-ray diffractometer (XRD), scanning electron microscope (SEM), and alternating current (AC) impedance technique. XRD and SEM results showed that the limit of the Li⁺ solubility in this solid solution was found to be within 25 at % . Over this limit, the second phase of LiNbO₃ was observed. With increasing the Li⁺ content (3x), the crystal structure of La_1/3NbO₃ changed from orthorhombic via tetragonal to cubic symmetry. The AC impedance analysis showed that the characteristic of Li⁺ conduction was present in the Li_3xLa_1/3−xNbO₃ solid solution and there was a maximum conductivity of 7.21×10⁻⁵ S cm⁻¹ at 3x=0.05.