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本文采用X射线衍射、中子衍射和热学分析等方法对LaAlO3晶体结构和相变进行了研究。计算和比较了室温LaAlO3晶体的两种不同的结构模型。确定了LaAlO3室温相的空间群为R3C(a=5.3648±2?,c=13.1113±3?),并对AlO6。八面体在室温下的取向和对LaAlO3晶体的相变过程的影响进行了研究。X-ray diffraction, neutron scattering and thermal analysis were used to determine the room temperature crystal structure of LaAlO3 and its phase transition. Two different models were calculated and compared. Tht space group of room temperature LaAlO3 is determined as R3C (a= 5.3648 ± 2?, c = 13.1113±3?). The influence of orientation of AlO6 octahedron or room temperature LaAlO3 crystal on the phase transition was studied.
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