Electrical properties of La<sub>2sub>Mo<sub>2sub>O<sub>9sub>/Al<sub>2sub>O<sub>3sub> nanocomposites fabricated by microwave sintering method
- 作者：D.M. Zhang ; Z. Zhuang ; X.P. Wang ; Y.X. Gao ; Q.F. Fang<sup> ; sup><sup>qffang@issp.ac.cnsup>
- 关键词：Nanocomposites ; Microwave processing ; Ionic conductivity
- 刊名：Journal of the European Ceramic Society
- 出版年：2012
- 期刊代码：53_09552219
- 类别：ms
- 出版时间：September, 2012
- 卷：32
- 期：12
- 页码：3239-3247
- 文件大小：1581 K
摘要
High density La<sub>2sub>Mo<sub>2sub>O<sub>9sub>/Al<sub>2sub>O<sub>3sub> nanocomposite electrolytes were successfully fabricated by microwave sintering method from the nano-scaled La<sub>2sub>Mo<sub>2sub>O<sub>9sub>/Al<sub>2sub>O<sub>3sub> powders. Phase formation, microstructure, grain size and electrical properties of the specimens were examined using X-ray diffraction, scanning electron microscopy, transmission electron microscopy and AC impedance spectroscopy. It was confirmed that the composite electrolytes consist of nanocrystalline La<sub>2sub>Mo<sub>2sub>O<sub>9sub> phase with an average grain size of 70-150 nm and a small amount of crystalline 伪-Al<sub>2sub>O<sub>3sub> phase at grain boundary. With increasing alumina content, the total conductivity at 600 掳C of the composite specimens increases at first and then decreases with a maximum value of about 0.024 S/cm appearing at 2.25 mol%alumina. It was suggested that the enhancement of total conductivity of the composites may be ascribed to the improvement of both grain and grain-boundary conduction introduced by the addition of appropriate amount of alumina.