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Coordination changes in crystalline and vitreous GeO2 |
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| Authors: | J P Itié A Polian G Calas J Petiau A Fontaine H Tolentino |
| Institution: | 1. Physique des milieux condensés, (URA 782) Univ. P. &2. M. , Curie Tour 13, 4eme Etage, 4 place jussieu, F-75252, Paris, Cedex 05;3. Laboratoire de Minéralogie Cristallographie, Univ. Paris VI et VII , 4 Place Jussieu, 75252, Paris, Cedex 05;4. LURE, CNRS/CEA/MEN, Univ. Paris-Sud , 91405, Orsay, Cedex |
| Abstract: | Abstract High pressure x ray absorption spectroscopy (XAS) has been performed up to 29 GPa on crystalline and amorphous GeO2. The modification of the x ray absorption near edge structure (XANES) as well as the variation of the Ge-O distance, indicate that the coordination of Ge changes from 4 to 6 above 6.5 GPa. The transition is confirmed by Raman spectroscopy. |
| Keywords: | high pressure GeO2 EXAFS Raman |