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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >The structure of GeO2-SiO2 glasses and melts: A Raman spectroscopy study
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The structure of GeO2-SiO2 glasses and melts: A Raman spectroscopy study

机译：GeO2-SiO2玻璃和熔体的结构：拉曼光谱研究

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摘要

We have investigated a series of glasses and melts along the GeO2-SiO2 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 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.
机译：我们使用原位拉曼光谱研究了沿着GeO2-SiO2连接的一系列玻璃和熔体。玻璃和熔体的结果均与连续的随机网络一致，在连续的随机网络中，存在着类似SiO2，GeO2和混合GeO2-SiO2的“区域”。最初通过3元和4元SiO4环容纳GeO2到SiO2网络中，当它们转变为较大的混合Ge / Si环时会丢失。 LO-TO模式的行为也与由不同“区域”组成的网络相一致，并且与Bruggeman有效媒体模型所预期的相似。在最高温度下，有迹象表明混合的Ge / Si环会转换回小的3元GeO4环和大的SiO4环。小的3元和4元SiO4环没有重整。

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