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The structure of GeO2-SiO2 glasses and melts: A Raman spectroscopy study |
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| Authors: | Grant S. Henderson Daniel R. Neuville Laurent Cormier |
| Affiliation: | a Department of Geology, University of Toronto, 22 Russell St., Toronto, ON, Canada M5S 3B1 b Physique des Minéraux et des Magmas, IPGP-CNRS, 4 Place Jussieu, 75005 Paris, France c Institut de Minéralogie et de Physique des Milieux Condensés, CNRS UMR 7590, Université Pierre et Marie Curie, Université Denis Diderot, 140 rue de Lourmel, 75015 Paris, France |
| Abstract: | We have investigated a series of glasses and melts along the GeO2-SiO2 join using insitu Raman spectroscopy. The results for both the glasses and melts are consistent with a continuous random network in which there are ‘regions’ that are SiO2-like, GeO2-like and mixed GeO2-SiO2-like. Incorporation of GeO2 into the SiO2 network is initially accommodated via the 3- and 4-membered SiO4 rings which are lost as they convert to larger mixed Ge/Si rings. The LO-TO mode behavior is also consistent with a network that is composed of different ‘regions’ and is similar to that expected from the Bruggeman effective media model. At the highest temperatures there are indications that the mixed Ge/Si rings convert back to small 3-membered GeO4 rings and large SiO4 rings; the small 3- and 4-membered SiO4 rings are not reformed. |
| Keywords: | 61.20.&minus p 61.43.Fs 64-70.kj 64-70.Ja 81.05.Kf 63.50&minus x 64.70.ph |
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