The structure of lithium, sodium and potassium germanate glasses, studied by Raman scattering
The structure of lithium, sodium and potassium germanate glasses, studied by Raman scattering
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DOI：
10.1016/0022-3093(79)90008-5
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发表时间：
1979-08
影响因子：
3.5
通讯作者：
H. Verweij;J. Buster
中科院分区：
文献类型：
--
作者：
H. Verweij;J. Buster
给出了碱金属锗酸盐玻璃的偏振和去偏振拉曼光谱，以及晶体化合物Li2O·2GeO2的拉曼粉末光谱； 3 Li2O·8 GeO2； 2 Li2O·9 GeO2; Li2O·7GeO2； 2 Na2O·9 GeO2； K2O·2GeO2； K2O·4GeO2和K2O·8GeO2。研究了组成范围0<x<0.333的碱金属锗酸盐玻璃：xA2O(1−x)GeO2。在晶体化合物拉曼光谱的高能范围内观察到的振动模式可以用对称和反对称的 O-Ge-O 和 Ge-O− 伸缩振动来解释。通过将玻璃的拉曼光谱与晶体化合物的拉曼光谱进行比较，并研究玻璃光谱的偏振特性，推导出锗酸盐玻璃的分子结构。观察到6配位Ge原子以网络结构出现，类似于晶体化合物2 Li2O·9 GeO2和2 Na2O·9 GeO2中出现的结构。在0.18范围内 <x<0.33 发现形成具有一个非桥接氧原子的四面体。这些四面体可能存在于晶体二锗酸盐 Li2O·2 GeO2 和 K2O·2 GeO2 中出现的网络中。
Polarized and depolarized Raman spectra of alkali germanate glasses are given, together with Raman powder spectra of the crystalline compounds Li2O · 2 GeO2; 3 Li2O · 8 GeO2; 2 Li2O· 9 GeO2; Li2O · 7 GeO2; 2 Na2O · 9 GeO2; K2O · 2 GeO2; K2O · 4 GeO2and K2O · 8 GeO2.The alkali germanate glasses:xA2O(1−x) GeO2are studied in the composition range 0 <x< 0.333. The vibrational modes observed in the high energy range of the Raman spectra of the crystalline compounds are interpreted in terms of symmetrical and antisymmetrical O-Ge-O and Ge-O−stretch vibrations. The molecular structure of the germanate glasses is deduced from a comparison of the Raman spectra of the glasses with those of the crystalline compounds, together with a study of the polarization properties of the glass spectra.It is observed that 6-coordinated Ge atoms occur in a network structure which resembles the structures occurring in the crystalline compounds 2 Li2O · 9 GeO2and 2 Na2O · 9 GeO2.In the region of 0.18 <x< 0.33 it is found that tetrahedra with one non-bridging oxygen atom are formed. These tetrahedra are probably present in a network as occurs in the crystalline digermanates Li2O · 2 GeO2and K2O · 2 GeO2.