Water and the glass transition temperature of silicate melts
Water and the glass transition temperature of silicate melts
复制标题
水和硅酸盐熔体的玻璃化转变温度
DOI：
10.1016/s0022-3093(03)00472-1
复制
发表时间：
2003
影响因子：
3.5
通讯作者：
G. Heide
中科院分区：
文献类型：
--
作者：
J. Deubener;R. Müller;H. Behrens;G. Heide
收集了水对硅酸盐熔体玻璃化转变影响的文献数据，其总水含量范围为3×10− 4至27 wt%。就玻璃化转变温度Tg_（max）=Tg/TgGN而言，其中TgGN是含有cw ≤ 0.02wt%总水的熔体的Tg，对于硅酸盐熔体，Tg_（max）对总水含量（cw）的均匀依赖性是明显的。Tg随水含量的增加而稳定降低，在水含量最低时最强烈，其中H2O主要以OH形式溶解。对于富含水的熔体，Tg的变化不太明显，但它并没有消失，即使在最大的水含量报告（约27重量%）。Tg.tagvs. CWIS由三组分模型拟合。该方法考虑了干玻璃、羟基和分子水的不同转变温度，将Tg Tg预测为这些温度的加权线性组合。所需的，但大多是未知的水形态的玻璃使用含水三硅酸钠和流纹岩的红外光谱数据估计。
Literature data on the effect of water on the glass transition in silicate melts are gathered for a broad range of total water content cwfrom 3×10−4to 27 wt%. In terms of a reduced glass transition temperature Tg∗=Tg/TgGN, where TgGNis Tgof the melt containing cw≈0.02 wt% total water, a uniform dependence of Tg∗on total water content (cw) is evident for silicate melts. Tg∗decreases steadily with increasing water content, most strongly at the lowest water content where H2O is dominantly dissolved as OH. For water-rich melts, the variation of Tg∗is less pronounced, but it does not vanish even at the largest water contents reported (≈27 wt%). Tg∗vs. cwis fitted by a three-component model. This approach accounts for different transition temperatures of the dry glass, hydroxyl and molecular water predicting Tg∗as a weighted linear combination of these temperatures. The required but mostly unknown water speciation in the glasses was estimated using IR-spectroscopy data for hydrous sodium trisilicate and rhyolite.