期刊
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS
卷 65, 期 -, 页码 405-415出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S0108768109016243
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [19656179]
- Global COE (Center of Excellence)
- [21686066]
- Grants-in-Aid for Scientific Research [19656179] Funding Source: KAKEN
It is shown that 21 ABX(3) perovskites with tilted BX6 octahedra and layered ordering of A cations can be generated on the basis of group-subgroup relations. These structures (with 16 different space groups) are classified into ten diffraction types in terms of the conditions for superstructure reflections caused by the ordering of A cations, tilting of BX6 octahedra and structural absences. SAED (selected-area electron diffraction) allows the distinction of seven of the 21 different perovskites, while additional symmetry analysis by CBED (convergent-beam electron diffraction) is needed for the remaining 14 structures. The space groups of lithium lanthanum titanate pseudomorphs (with discrete chemical compositions) are successfully deduced by electron diffraction experiments.
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