CRYSTALLOGRAPHIC STUDY OF LANTHANUM ALUMINATE BY CONVERGENT-BEAM ELECTRON-DIFFRACTION

被引：15

作者：

YANG, CY ^{[1
]}

HUANG, ZR ^{[1
]}

YANG, WH ^{[1
]}

ZHOU, YQ ^{[1
]}

FUNG, KK ^{[1
]}

机构：

[1] CHINESE ACAD SCI,BEIJING LAB ELECTRON MICROSCOPY,BEIJING 100080,PEOPLES R CHINA

来源：

ACTA CRYSTALLOGRAPHICA SECTION A | 1991年 / 47卷

关键词：

D O I：

10.1107/S0108767391005603

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The space group of a well annealed LaAlO3 crystal, determined by convergent-beam electron diffraction, is Fm3cBAR. Lower-symmetry monoclinic and triclinic phases have also been observed in not so well annealed and as-grown crystals. The cubic structure with Fm3cBAR symmetry arises from a side-doubling transformation of the cubic perovskite structure due to the tilting of oxygen octahedra. Lower-symmetry phases are associated with the distortion of the cubic lattice due to oxygen deficiency or strain in the crystal. The previously reported R3cBAR space group is probably due to the coexistence of the cubic phase and a lower-symmetry phase in the same crystal.

引用

页码：703 / 706

页数：4

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