非晶态硅酸盐介观团粒结构模型及其参数

非晶态硅酸盐是典型的近程有序,远程无序的准稳定态体系,采用分数维理论与X射线小角散射(SAXS)、拉曼光谱(RS)、透射电子显微镜(TEM)等分析技术相结合,对高温熔融法和溶胶凝胶法合成的CaO-Al2O3-SiO2及Na2O-Al2O3-SiO2系列低维非晶硅酸盐试样进行了网络分数维、微粒微孔分数维、网络自相似比、回旋半径、微孔体积百分率、团粒尺度和微孔尺度等介观参数群的定量测定及研究,获得了低温硅酸盐凝胶、高温硅酸盐熔体(仿岩浆熔体)之淬火玻璃相均具有纳米级(几个nm至几十nm)统计性自相似团粒结构的结论,进而建立了介观团粒结构模型,揭示了该结构模型内各介观参数与其宏观参量的相关性,从而为非晶硅酸盐提供了一整套介观定量结构参数,确定了岩浆熔体是准稳定的、可演变的分数维体系,对探索自然界岩浆的地球化学特征以及低维复合材料结构性能的改进具有重要的理论和实用意义.

A Model of Mesoscopic Aggregation Structure in Non-Crystal Silicates and Its Parameters

The non-crystal silicates is special system that is metastable state of near-way order and far-way disorder.In this work,the network fractal dimension,pore fractal dimension,network self-similarity proportion,radius of gyration,pore volume percent,aggregation size and pore size(seven parameters) in the low dimension series(CaO-Al2O3-SiO2 and Na2O-Al2O3-SiO2 series) synthesizing via high temperature melting and sol gel methods have been studied and measured by means of fractal dimension theory,small-angle X-ray scattering(SAXS),Raman spectrum(RS)and transition electron microscopy(TEM).The nanometer self-similarity aggregation structure in the low temperature silicate gel,high temperature silicate melts(simulating magma melts)and its quenching glasses have been discovered.The size of aggregation structure is about a few nanometers to dozens of nanometers.Further more the mesoscopic aggregation structure model is established.The relationship between the parameters of the structure model and macro-characteristics in low-dimension silicates is showed.This model provide a set quantitative parameters of the aggregation structure(in nanometer size) for non-crystal silicate.It is concluded that the magma melts is an evolutive fractal dimension system.Therefore,it is of great significance for deliberating geochemistry characteristic of natural magma and enhancing performance of low dimension silicate materials.