硅酸盐熔体结构的研究进展和问题

AVDANCE IN THE STRUCTURE STUDIES ON SILICATE MELTS

概括地介绍了硅酸盐熔体结构的三种研究途径和方法，从硅酸盐熔体的分子聚合结构单元测试、阳离子和挥发份的结构作用、物理化学性能测试及量子化学研究等五个方面，阐明了硅酸盐熔体结构研究的主要成就，指出了该研究领域中存在的主要问题。

Three kinds of ways and methods about the studies on structure of silicate melts are introduced in this paper. The main achievements and some problems about the structure of silicate melts are illustrated and pointed out from five research fields of silicate melts, which are molecular polymerization, the structural roles of cations and volatiles, the measurement of physical properties and chemical bonds in quantum chemistry: ①“Polymerization model' is an established theory of silicate melts, however, the short quantitative description has not been carried out. ② The quantitative determination of polymers in silicate melts is the key to comprehend the “polymerization model' and the properties of silicate melts quantitatively. If the three methods (TMS, MAS NMR, LR) are performed synthetically, the quantitative measurement for polymes of silicate melts will be improved. ③ For the melts with high temperature and high pressure, until now there is no insufficient evidence to show the translation of aluminum from four coordination to six coordination, or laboratory study about the relation between the forming conditions of silicate melt and its T O T bond angel. The above studies are important to understand abnormal viscosity and density change of silicate melts under high pressure condition. ④ Two stage dissolving model of H 2O in silicate melt has been put forward, but the quantitative dissolving model of CO 2 and other volatiles wait for further studies. ⑤ Split phases are extensively existent in silicate melts, however the relation between split phases and structural stability in silicate melt has not been performed.