镥铝钙钛矿LuAlO3的熔融行为
The melting behavior of lutetium aluminum perovskite LuAlO3
摘要：
DTA测量与氧化铝和氧化镥的混合物周围的1：1钙钛矿组合物进行高达1970 ℃。C.起始温度为1901 ℃的峰值是由于共晶Lu 4Al 2 O 9（单斜相）和LuAlO 3（钙钛矿）的熔化。无论是钙钛矿的包绕熔化还是其在固相中的分解都无法通过实验解决。共晶峰尺寸的最大值在x=0.44附近，在钙钛矿的富Lu侧上，这与LuAlO 3在约0.44处包结熔化的结论一致。1907度C，如Wu，Pelton，J. Alloys Compd. 179（1992）热力学平衡计算表明，在强还原条件下（氧分压<10^{-13} bar），氧化铝（III）可被还原为低价氧化物或甚至Al金属。结果表明，在此条件下，可以出现一个新的液态Al相场。
英文摘要：
DTA measurements with mixtures of aluminum oxide and lutetium oxide around the 1:1 perovskite composition were performed up to 1970 deg. C. A peak with onset 1901 deg C 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. 1907 deg. C as proposed by Wu, Pelton, J. Alloys Compd. 179 (1992) 259. Thermodynamic equilibrium calculations reveal, that under strongly reducing conditions (oxygen partial pressure <10^{-13} bar) 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.
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