Structural and Bonding Trends in Tin Pyrochlore Oxides

The structures of a number of pyrochlore stannates of the typeLn2Sn2O7, withLn=Y, La, Pr, Nd, Tb–Lu andLn=Sm, Eu, and Gd, have been refined by Rietveld analysis from 1.4925 Å neutron powder and 1.0 Å X-ray powder diffraction data, respectively. The single variable oxygen positional parameter is obse...

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Bibliographic Details
Published in:Journal of solid state chemistry 1997-04, Vol.130 (1), p.58-65
Main Authors: Kennedy, Brendan J., Hunter, Brett A., Howard, Christopher J.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Inorganic compounds
Physics
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
Water, oxides, hydroxides, peroxides
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Summary:The structures of a number of pyrochlore stannates of the typeLn2Sn2O7, withLn=Y, La, Pr, Nd, Tb–Lu andLn=Sm, Eu, and Gd, have been refined by Rietveld analysis from 1.4925 Å neutron powder and 1.0 Å X-ray powder diffraction data, respectively. The single variable oxygen positional parameter is observed to decrease systematically with the increasing lattice parameter, causing periodic shifts in both the Sn–O and Sn–O–Sn interactions. TheLntemperature factors are highly anisotropic, and this is explained in terms of the stereochemistry of theLnatoms. Bond valence sum calculations of the materials have been performed to explore changes in the bonding resulting from the structural changes.
ISSN:0022-4596
1095-726X
DOI:10.1006/jssc.1997.7277