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Issue 34, 2006
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A theoretical and experimental study of the distorted pyrochlore Bi2Sn2O7

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Abstract

The pyrochlore based bismuth stannate, Bi2Sn2O7, is a material with important applications in catalysis and gas sensing. The thermodynamically stable α phase has 352 atoms in the unit cell and is one of the most complex oxide crystal structures to have been solved by powder diffraction. We have performed a full atomic relaxation and calculated the electronic structure, using gradient corrected density functional theory, with the resulting structure in very good agreement with the previous experimentally determined unit cell. The computed density of states is in excellent agreement with our valence band X-ray photoelectron spectra. The combined results shed new light on the bonding and lone pair activity in this material. A mixture of Bi 6s and O 2p states are found to dominate the top of the valence band while Sn 5s, O 2p and Bi 6p states dominate the bottom of the conduction band. The differing contributions of Sn 5s and Bi 6s states to the valence and conduction bands reflect both differences in atomic binding energies and differences in the strength of the metal s interactions with O 2p. The preference of this material for a distorted structure and its unique catalytic and gas sensing activity are discussed.

Graphical abstract: A theoretical and experimental study of the distorted pyrochlore Bi2Sn2O7

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Publication details

The article was received on 05 May 2006, accepted on 12 Jul 2006 and first published on 27 Jul 2006


Article type: Paper
DOI: 10.1039/B606413B
Citation: J. Mater. Chem., 2006,16, 3452-3458
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    A theoretical and experimental study of the distorted pyrochlore Bi2Sn2O7

    A. Walsh, G. W. Watson, D. J. Payne, G. Atkinson and R. G. Egdell, J. Mater. Chem., 2006, 16, 3452
    DOI: 10.1039/B606413B

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