Diffusion Coefficients of Fe~(2+) and Ti~(4+) and Their Influence on Process of Diffusion Treatment of Sapphire

The diffusion coefficients of Fe2+ and Ti4+ and their influence on the process of diffusion treatment of sapphire are discussed. According to the thickness of the diffusion layer and the process of the diffusiontreated sapphire from Thailand, the diffusion coefficients of the Fe+2 and Ti4+ are computed. Experiment shows that diffusion coefficient of the colouration ion is important in working out the diffusion process.