X-ray powder and electron diffraction studies of the average structure and superstructure of BiLa{sub 2}O{sub 4.5}
- Institute of Low Temperature and Structure Research, Wroclaw (Poland)
An average structure of BiLa{sub 2}O{sub 4.5} has been determined by X-ray powder diffraction and refined by the Rietveld refinement procedure (R3m space group, a = 3.963(1) {angstrom}; c = 9.964(4) {angstrom}; hexagonal setting). The fluorite-type structure, with the unit cell stretched along [111] direction and with oxygen atoms displaced slightly, contains statistically distributed Bi/La and O atoms. A hexagonal superstructure unit cell of BiLa{sub 2}O{sub 4.5} (a = 31.67 {angstrom}, c = 19.93 {angstrom}), probably a consequence of oxygen ordering, has been determined by electron diffraction. A comparison of the six phases found in the Bi{sub 2}O{sub 3}-La{sub 2}O{sub 3} system is given to indicate their common structural features. BiLa{sub 2}O{sub 4.5} can be treated as a representative of the Bi{sub 3}RE{sub 5}O{sub 12}-type phases (RE = Y, La-Lu).
- OSTI ID:
- 70181
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 116; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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