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Nature 430, 155-157 (8 July 2004) | doi:10.1038/430155a; Published online 8 July 2004
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Condensed-matter physics: Charge-ordering in oxides
Michael Coey1
Abstract
Transition metals form mixed-valence oxides that are expected to have ordered arrangements of d-shell electrons. But the ionic picture must be rethought to include oxygen 'holes' in the charge-ordered patterns.
The crystal chemistry of oxides seemed as solid as a rock; indeed, most rocks are oxides, in which 90% of the ions involved — Si4+, Al3+, Mg2+, Na+, O2- — adopt a stable configuration with just ten electrons. To form ionic bonds, the electrons transfer their allegiance from metals to oxygen, filling up the 2p shell to arrive at a 1s22s22p6 configuration.
- Michael Coey is in the Department of Physics, Trinity College, Dublin 2, Ireland.
e-mail: Email: jcoey@tcd.ie
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