Water and the density of silicate glasses
Water and the density of silicate glasses
复制标题
水和硅酸盐玻璃的密度
DOI：
10.1007/s004100050567
复制
发表时间：
2000
影响因子：
3.5
通讯作者：
M. Wilke
中科院分区：
文献类型：
--
作者：
P. Richet;A. Whittington;F. Holtz;H. Behrens;S. Ohlhorst;M. Wilke
对40种含水硅酸盐玻璃的密度测定结果进行了评述，结果表明，水的室温偏摩尔体积为12.0 ± 0.5cm ~ 3/mol。该值适用于简单或矿物组合物以及复杂的天然玻璃，从流纹岩到软玉组合物，在高达10-20 kbar的压力下制备并含有高达7重量%的H2O。该体积不随无水硅酸盐相的摩尔体积、其聚合度或水形态而变化。在很宽的组成范围内，这个恒定值意味着氢氧根离子和分子水之间反应的体积变化为零，并且至少在玻璃中，物种形成不依赖于压力。与Ochs和Lange（1997，1999）的数据一致，SiO2-M2 O系统（M=H，Li，Na，K）体积膨胀的系统学表明，硅酸盐玻璃中H2O的偏摩尔热膨胀系数约为4 × 10−5 K−1。
Abstract A review of published and newly measured densities for 40 hydrous silicate glasses indicates that the room-temperature partial molar volume of water is 12.0 ± 0.5 cm3/mol. This value holds for simple or mineral compositions as well as for complex natural glasses, from rhyolite to tephrite compositions, prepared up to 10–20 kbar pressures and containing up to 7 wt% H2O. This volume does not vary either with the molar volume of the water-free silicate phase, with its degree of polymerization or with water speciation. Over a wide range of compositions, this constant value implies that the volume change for the reaction between hydroxyl ions and molecular water is zero and that, at least in glasses, speciation does not depend on pressure. Consistent with data from Ochs and Lange (1997, 1999), systematics in volume expansion for SiO2–M2O systems (M=H, Li, Na, K) suggests that the partial molar thermal expansion coefficient of H2O is about 4 × 10−5 K−1 in silicate glasses.