An improved thermodynamic approach to the stability of multi-component silicate glasses in aqueous solutions
An improved thermodynamic approach to the stability of multi-component silicate glasses in aqueous solutions
复制标题
一种改进的热力学方法来测定水溶液中多组分硅酸盐玻璃的稳定性
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
P. Geasee
中科院分区：
文献类型：
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作者：
R. Conradt;P. Geasee
开发了一个速率方程，通过该方程可以计算多组分硅酸盐玻璃在稀水溶液中的溶解速率作为pH值，CO2分压和盐度的函数。水化吉布斯自由能是通过将水溶液处理为玻璃中各种阳离子的水性物质的稀释体系，以及将玻璃处理为从其基本相图中获得的构成相的混合物而得到的。除了自由能，在玻璃表面吸收的H +和OH -的量被考虑作为速率决定因素。计算的硅、A型、E型、岩石和矿渣玻璃纤维的溶解速率与实验值在线性标度上在±30%以内一致。
A rate equation is developed by which the dissolution rates of multicomponent silicate glasses in diluted aqueous solutions can be calculated as a function of pH, CO 2 partial pressure, and salinity. Gibbs free energies of hydration are derived by treating the aqueous solution as a diluted system of aqueous species of the various cations in the glass, and by treating the glass as a mixture of the constitutional phases taken from its basic phase diagram. Beside the free energies, the amounts of H + and OH - absorbed at the glass surface are taken into account as rate determining factors. Calculated dissolution rates of silica, A type, E type, rock, and slag glass fibres agree with experimental values within ±30% on a linear scale.