The state of magnesium in silicate glasses and melts
The state of magnesium in silicate glasses and melts
复制标题
硅酸盐玻璃和熔体中镁的状态
DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
R. Kuryaeva
中科院分区：
文献类型：
--
作者：
R. Kuryaeva
分析了含镁硅酸盐玻璃和熔体的性质，并与以铝代镁的玻璃和熔体的性质进行了比较。特别地，与钙长石成分CaAl 2Si 2 O 8的玻璃和熔体的性质相比，分析透辉石成分CaMgSi 2 O 6的玻璃和熔体的性质。它表明，铝硅酸盐和镁硅酸盐玻璃和熔体的性质不同，不那么强烈，因为应该预期后，网络形成离子取代改性剂离子。利用表征阳离子场强的参数γn表明，Mg ~（2+）离子既能起到Al ~（3+）离子的网络形成作用，又能起到Ca ~（2+）离子的修饰作用。根据在不同压力下相对密度（d-d 0）/d的变化对解聚度NBO/T的依赖性，估计CaMgSi 2 O 6组成的玻璃和熔体的解聚度为0.4-0.5（非桥氧原子数与网络形成剂阳离子数之比）以及硅酸盐熔体的等温体积模量Kt与NBO/T的关系。
The properties of silicate glasses and melts containing magnesium are analyzed in comparison with the properties of glasses and melts in which magnesium is replaced by aluminum. In particular, the properties of the glass and the melt of the diopside composition CaMgSi2O6 are analyzed in comparison with the properties of the glass and the melt of the anorthite composition CaAl2Si2O8. It is demonstrated that the properties of aluminosilicate and magnesium silicate glasses and melts differ not so strongly as should be expected upon replacement of modifier ions by network-former ions. By using the parameters γn characterizing the cation field strength, it is shown that Mg2+ cations can fulfill both the function of network formers like Al3+ cations and the function of modifiers like Ca2+ cations. The degree of depolymerization of the glass and the melt of the composition CaMgSi2O6 is estimated to be 0.4–0.5 from the dependences of the change in the relative density (d − d0)/d at different pressures on the degree of depolymerization NBO/T (the ratio of the number of nonbridging oxygen atoms to the number of network-former cations) for silicate glasses and the dependence of the isothermal bulk modulus Kt on the quantity NBO/T for silicate melts.