Synthesis of YAG nanopowder by the co-precipitation method: Influence of pH and study of the reaction mechanisms

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• 作者：Caroline Marlot^a ; ^b ; ^{caroline.marlot@isl.eu} ; Elodie Barraud^a ; Sophie Le Gallet^b ; Marc Eichhorn^a ; Fré ; dé ; ric Bernard^b
• 关键词：Co-precipitation ; pH ; Calcination ; Chemical properties ; YAG
• 刊名：Journal of Solid State Chemistry
• 出版年：2012
• 期刊代码：130_00224596
• 类别：ch
• 出版时间：July, 2012
• 卷：191
• 期：Complete
• 页码：114-120
• 文件大小：977 K

摘要

YAG nanopowders with an average grain size of 30 nm have been successfully synthesized by the co-precipitation method using nitrates with precipitant of ammonium hydrogen carbonate. The influence of precipitation conditions such as pH, aging time and calcination temperature on the formation of secondary phases has been studied. The accurate control of pH value at every stage of precipitation process is crucial to avoid the presence of YAM (Yttrium Aluminium Monoclinic, Y₄Al₂O₉) and yttrium oxide (Y₂O₃) after calcination. The reaction mechanisms have been investigated using different techniques such as infrared spectroscopy, x-ray diffraction and thermal analyses. The YAG phase is formed around 1050 掳C passing through an intermediate phase called YAP (Yttrium Aluminium Perovskite, YAlO₃). Local chemical heterogeneities are responsible for the deviation of the Y:Al ratio and the formation of YAP during heat treatment.