In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 36, No. 3R ( 1997-03-01), p. 1146-
Abstract:
Since the early study by Galasso and Pyle, the structure of complex perovskite compounds with 1:2 ordering of B-site ions, ordered perovskite compounds, has been thought to be Ba(Sr 1/3 Ta 2/3 )O 3 -type hexagonal. Recently, a structural phase transformation has been found in A-site substituted ordered perovskite compounds, (Ba,Sr)(B' 1/3 B" 2/3 )O 3 . The structural change due to the phase transformation has been connected with the tilting of oxygen octahedra in the perovskite cell. However, the structure of the transformed phase has not been clarified because there has not been any model to treat the crystal structure of ordered perovskite compounds having tilted oxygen octahedra. In this paper, Glazer's model for structural changes in cubic perovskite due to the tilting of oxygen octahedra has been expanded to the 1:2 ordered perovskite. Based on the model, electron diffraction and X-ray diffraction of (Ba 1- x Sr x )(Mg 1/3 Ta 2/3 )O 3 are discussed. A monoclinic unit cell in space group C 2 h 6 with an angle γ 〉 90 °, which is derived from antiphase tilting of oxygen octahedra, successfully explains the experimental results.
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.36.1146
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
1997
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
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