硅酸盐熔体的体积行为  

BEHAVIOUR OF THE VOLUMES OF SILICATE MELTS

作　　者：张金民[1] 叶大年[1] 

机构地区：[1]中国科学院地质研究所

出　　处：《矿物学报》1989年第2期112-118,共7页Acta Mineralogica Sinica

基　　金：国家自然基金

摘　　要：通过研究硅酸盐熔体的氧平均体积,并与硅酸盐玻璃相对比,提出硅酸盐熔体的体积可分为两部分,即硅-氧骨架部分和阳离子部分,根据氧平均体积变化规律,得出硅-氧骨架部分的体积基本不随温度变化,硅酸盐熔体的体积膨胀主要是由于“氧化物”部分的局部膨胀所致,进一步提出O^(2-)半径基本不变,而主要是阳离子半径变化,并讨论了膨胀的机制。The oxygen-shared volumes of some silicate melts are calculated and then compared with those of silicate glasses. It is suggested that the volume of a silicate melt can be divided into two parts. One is contributed by the Si-O network, which shows no significant change from glass to melt at different temperatures. The other is contributed by the 'oxides', which take up most of the expansion of the melt. It is further proposed that the dilation of cations is the major factor leading to the expansion of a melt, while the radius of O^2-remains basically the same.

关 键 词：硅酸盐 溶体 体积 离子半径 

分 类 号：P578.94[天文地球—矿物学]