Thermal expansion and cation disorder in Bi{sub 2}InNbO{sub 7}

Journal Article · Sun May 15 04:00:00 EDT 2005 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2004.12.012· OSTI ID:20725936

Qingdi, Zhou ^[1]; Kennedy, Brendan J ^[1]; Ting, Valeska ^[2]; Withers, Ray L ^[2]

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1. School of Chemistry, Centre for Heavy Metals Research, University of Sydney, F11 Sydney, New South Wales 2006 (Australia)
2. Research School of Chemistry, Australian National University, Canberra, ACT 0200 (Australia)

The structure of the pyrochlore-type oxide Bi{sub 2}InNbO{sub 7} has been investigated between room temperature and 700 deg. C using electron and synchrotron X-ray powder diffraction and at room temperature and 10K using neutron diffraction methods. Bi{sub 2}InNbO{sub 7} exhibits an A{sub 2}B{sub 2}O{sub 7} cubic pyrochlore-type average structure at all temperatures that is characterized by an apparently random mixing of the In{sup 3+} and Nb{sup 5+} cations on the octahedral B sites. The Bi cations on the eight-coordinate pyrochlore A sites are displacively disordered, presumably as a consequence of their lone pair electron configuration. Heating the sample does not alter this disorder.

• OSTI ID: 20725936
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 5 Vol. 178; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
BISMUTH COMPOUNDS
CATIONS
INDIUM COMPOUNDS
INDIUM IONS
NEUTRON DIFFRACTION
NIOBIUM COMPOUNDS
NIOBIUM IONS
PYROCHLORE
TEMPERATURE RANGE 0273-0400 K
THERMAL EXPANSION
X-RAY DIFFRACTION