|
|||||
|
|
The structure of GeO2-SiO2 glasses and melts: A Raman spectroscopy study |
|
| Authors: | Grant S Henderson Daniel R Neuville Laurent Cormier |
| Institution: | 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 |
| 本文献已被 ScienceDirect 等数据库收录！ | |