Title: Crystal structure of the 4H BaCrO3 polytype
Abstract: The structure of the four-layer hexagonal BaCrO3 polytype, prepared at high temperature and high pressure, was determined utilizing a Picker FACS-I diffractometer. The hexagonal black crystal was found to crystallize with a four-layer stacking sequence in space group P63mmc having unit cell parameters a = 5.660(1) and c = 9.357(1) Å. The structure was determined from 668 independent reflections of which 605 were considered observed. Equivalent reflections were averaged and this operation yielded 130 unique, observed reflections. Refinement of the structure by least-squares methods gave a conventional R value of 3.0%. The structure consists of a four-layer stacking sequence of close-packed BaO3 layers containing tetravalent chromium in all the octahedral oxygen interstices. The compound was found to be isostructural with β-BaMnO3 and the recently reported BaRhO3 and SrMnO3.
Publication Year: 1982
Publication Date: 1982-07-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 12
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