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Distinction between six- and fourfold coordinated silicon in SiO2 polymorphs via electron loss near edge structure (ELNES) spectroscopy |
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| Authors: | T Sharp Z Wu F Seifert B Poe M Doerr E Paris |
| Institution: | 1. Bayerisches Geoinstitut, Universit?t Bayreuth, D-95440, Bayreuth, Germany 2. Institut des Materiaux de Nantes, CNRS, F-44072, Nantes Cedex 03, France 3. Lehrstuhl Keramik und Verbundwerkstoffe, Universit?t Bayreuth, D-95440, Bayreuth, Germany 4. Dipartimento di Scienze della Terra, Università di Camerino, I-62032, Camerino, Italy |
| Abstract: | Si K-, L- and O K-edge ELNES spectra of natural α-quartz and synthetic coesite on one side and synthetic stishovite on the other show characteristic differences that can be related, by comparison with multiple-scattering (MS) calculations, to the fourfold vs. sixfold coordination of Si in these polymorphs of SiO2. It is shown by MS calculations on large clusters that the outer shells contribute relatively little to the overall topologies of the spectra. Therefore, distinction between fourfold- and sixfold-coordinated Si is possible even on a nm scale and probably also in amorphous substances. |
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