Property Of Minerals Of MgO-FeO-SiO₂ System

This thesis is consist of two chapter, In the first chapter of this paper, We study the preparation of Silica Sols and self-Assembled Thin Films. Electrostatic Self-Assembly Multilayer(ESAM) is a new technique for the process of materials for a few 10 years, It is important for study of Nanoscience and fabrication of nanomaterials. Translucent SiO2 sols were prepared from TEOS using NH₃.H₂O as crystal, polyelectrolyte/SiO₂ composite films were fabricated via electrostatic self-assembly multilayer method, and SiO₂ thin films were formed by heat-treating the polyelectrolyte/SiO₂ composite films to eliminate the polyelectrolyte and other components in composite films. The prepared SiO₂ sols, polyelectrolyte/SiO₂ composite films and SiO₂ thin films were investigated with transmission electron microscope, Fourier transform infrared spectrophotometer and 721 spectrophotometer. In the second chapter of the paper, using dynamics compression and thermodynamics method we study the property of (Mg,Fe) SiO₃-perovskite , The result of geophysics study have showed: understanding of the property of the dominant phase of lower mantle -(Mg,Fe ) SiO₃-perovskite is important for better understanding of the composition and structure in the lower mantle, In situ X-ray diffraction measurements of MgSiO₃ were performed at high pressure and temperature similar to the conditions ant earth's core-mantle...