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Perovskite Phases in the Systems A II O–U VI O 3 . II. On The System A 2 II B II U VI O 6 , with A II , B II = Ba, Sr, Ca
Author(s) -
Griffiths A. J.,
KemmlerSack S.
Publication year - 1980
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19804660114
Subject(s) - ion , spectral line , alkaline earth metal , chemistry , crystallography , infrared spectroscopy , x ray crystallography , physics , analytical chemistry (journal) , perovskite (structure) , diffraction , alkali metal , organic chemistry , chromatography , astronomy , optics
Studies on the system A 2 II B II U VI O 6 with A II , B II = Ba, Sr, Ca or combinations of these have shown that the alkaline earth ions cannot substitute each other in all proportions. The perovskites were studied by X‐ray diffraction and vibrational spectroscopic methods. The lattice vibration region of the far infrared spectra proved to be of particular value in providing information on the occupancy of the A and B sites. Analysis of the spectra shows that, in the majority of cases, contary to the geometrical predictions some of the larger alkaline earth ions occupy the six‐coordinated B sites and some smaller ions the A positions. The number of ions that take in this A ↔ B site‐exchange can amount to 20%, but in normally smaller.