The melting behavior of lutetium aluminum perovskite LuAlO₃

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• 作者：Detlef Klimm
• 关键词：A1. Phase diagrams ; A2. Growth from melt ; B1. Oxides
• 刊名：Journal of Crystal Growth
• 出版年：2010
• 出版时间：15 February 2010
• 年：2010
• 卷：312
• 期：5
• 页码：730-733
• 全文大小：285 K

文摘

DTA measurements with mixtures of aluminum oxide and lutetium oxide around the 1:1 perovskite composition were performed up to . A peak with onset was due to the melting of the eutectic Lu₄Al₂O₉ (monoclinic phase) and LuAlO₃ (perovskite). Neither peritectic melting of the perovskite nor its decomposition in the solid phase could be resolved experimentally. The maximum of the eutectic peak size is near x=0.44, on the Lu-rich side of the perovskite, which is consistent with the conclusion that LuAlO₃ melts peritectically at ca. as proposed by Wu, Pelton, J. Alloys Compd. 179 (1992) 259. Thermodynamic equilibrium calculation reveals that under strongly reducing conditions (oxygen partial pressure ) aluminum(III) oxide can be reduced to suboxides or even Al metal. It is shown that under such conditions a new phase field with liquid Al can appear.