Raman spectra of K2O–B2O3 glasses and melts
Raman spectra of K2O–B2O3 glasses and melts
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DOI：
10.1016/s0022-3093(01)00752-9
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发表时间：
2001-11
影响因子：
3.5
通讯作者：
R. Akagi;N. Ohtori;N. Umesaki
中科院分区：
文献类型：
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作者：
R. Akagi;N. Ohtori;N. Umesaki
用高温拉曼光谱研究了k2o - b2o3玻璃及其熔体的结构。随着K2O含量的增加和温度的升高，在10和20 mol%的K2O - b2o3玻璃/熔体中，仅由BØ3triangular单元组成的硼砂环转变为由BØ4tetrahedral （Ø=桥接氧原子）和BØ3units组成的五硼酸盐基团。在30mol %的k2o - b2o3玻璃/熔体中，拉曼光谱显示，随着温度的升高，硼酸盐种类的结构发生了变化，从BØ4tetrahedral单元变为含有非桥氧的三角单元BØ2O−。从拉曼带反褶积得到的四配位硼原子N4分数在玻璃化转变温度以上逐渐减少，并在1400 K以上收敛到一个恒定值。这种现象可以用热力学过程来解释。
The structures of K2O–B2O3glasses and melts have been studied by high-temperature Raman spectroscopy. With an increase in the K2O content and with increasing temperature, the boroxol rings, which only consist of BØ3triangular units, were converted into pentaborate groups which consist of BØ4tetrahedral (Ø=bridging oxygen atom) and BØ3units in the 10 and 20 mol% K2O–B2O3glasses/melts. In the 30 mol% K2O–B2O3glass/melt, the Raman spectra indicated a structural change in the borate species from BØ4tetrahedral units to metaborate, BØ2O−, triangular units with non-bridging oxygen with increasing temperature. The fraction of four-coordinated boron atoms, N4, obtained from deconvolution of the Raman bands was gradually reduced above the glass transition temperature and converged to a constant value over 1400 K. This phenomenon could be explained by a thermodynamic process.