硼硅酸盐玻璃
拉曼光谱
解聚
三元运算
碱金属
材料科学
矿物学
分析化学(期刊)
化学
光学
冶金
物理
高分子化学
有机化学
程序设计语言
色谱法
计算机科学
作者
D. Manara,Agnès Grandjean,Daniel R. Neuville
出处
期刊:American Mineralogist
[Mineralogical Society of America]
日期:2009-05-01
卷期号:94 (5-6): 777-784
被引量:211
摘要
This study is focused on the behavior of ternary SiO2-Na2O-B2O3 borosilicate glasses at temperatures between 298 and 1800 K. Unpolarized Raman spectra were measured up to high temperature. SiO2-Na2O-B2O3 glass samples were prepared with different values of the ratio R = [Na2O]/[B2O3], while the ratio K = [SiO2]/[B2O3] was kept constant and equal to 2.12. Spectra were measured at room temperature in samples with 0.43 ≤ R ≤ 1.68, and the effect of the modifier content was clearly observed in these glasses, only in partial agreement with previous literature results. In particular, the formation in the glass of sodium-danburite units Na2O·B2O3·2SiO2 was postulated. This feature led to a new assessment of R*, the critical value of R above which every new alkali atom added to the system breaks a Fo-O-Fo (Fo = glass former) bridge causing depolymerization of the glass. A revised formula is proposed to obtain the value of R* as a function of K.
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