Solid state diffusion between silica glass and CaO, and MgO

Abstract

By diffusion of solid states, pseudowollastonite, forsterite and cristobalite phases are identified.Then silica glass rod is used as silica component. The growth of cristobalite phase is observed, onthe contrary, silicate minerals do not develope according to the increase of diffusion time.
The growth of cristobalite depends on heating time, temperature and the kind of oxide component. Thelarger interaction between metallic atom and oxygen, the smaller growth of cristobalite is observed. CaO component promote cristobalitization, compared with MgO. Interaction of Ca-O is smaller than that of Mg-O, therefore diffusion rate of CaO component is larger than that of MgO. Formation of cristobalite depends on the rate of diffusion.