Abstract
We have investigated a series of glasses and melts along the GeO 2 –SiO 2 join using in situ Raman spectroscopy. The results for both the glasses and melts are consistent with a continuous random network in which there are ‘regions’ that are SiO 2 -like, GeO 2 -like and mixed GeO 2 –SiO 2 -like. Incorporation of GeO 2 into the SiO 2 network is initially accommodated via the 3- and 4-membered SiO 4 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 GeO 4 rings and large SiO 4 rings; the small 3- and 4-membered SiO 4 rings are not reformed.
Published Version
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