Microstructural and electrical features of lithium Ce-monazite

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• 作者：Teresa Herná ; ndez ; Rafael Vila ; José ; Ram&#xf3 ; n Jurado ; Eva Chinarro ; Joaquí ; n Molla ; Piedad Martí ; n
• 关键词：Cerium monazite ; Electrical conductivity ; Lithium doped
• 刊名：Solid State Ionics
• 出版年：2008
• 期刊代码：96_01672738
• 类别：ch
• 出版时间：April 2008
• 卷：179
• 期：7-8
• 页码：256-262
• 文件大小：963 K

摘要

Two cerium-monazites containing excess phosphorous were synthesized by a precipitation method. The Ce-phosphate selected samples were doped with 1.3 wt.%and 4.7 wt.%lithium and sintered in dry air. The phase evolution as a function of temperatures was investigated. The XRD and microstructural studies reveal that Ce-monazite appears at low temperature (350 °C). Lithium is incorporated into the monazite lattice up to 1000 °C. The material achieved at this temperature is a composite constituted by mainly CePO4 monazite grains, surrounding by a minor Li-Phosphate glassy phases. Precipitation of cubic Ceria, and Li3PO4 as secondary phases are also provided. Li introduction into the Ce-monazite lattice is accounted due to the fact that the main XRD monazite peaks, is significantly shifting towards higher diffraction angles. For the larger Li content sample, when temperature increases (1250 °C), the cerium oxide are the major phase depicted.