明溪蓝刚玉的水热溶液改色实验初步研究

A Preliminary Study of Mingxi Blue-Corundum Colour-Modified Test in the Hydrothermal Solution

明溪蓝刚玉中 Fe主要以 Fe3 + 形式存在 ,Fe3 + 的 d- d电子跃迁和 Fe2 + - Ti4 + / Fe3 + -Ti3 + 、O2 - Fe3 + 间电荷转移是致色的主要因素 ;浓度差可以作为扩散动力 ;氢含量的提高可以促进蓝色致色因子的形成。采用高温高压水热溶液方法对蓝刚玉进行改色处理 ,可消除刚玉中的杂色调 ,使颜色向纯蓝色方向变化。

The iron element of the blue-corundum from Mingxi County occurs mostly in the form of ferric irons (Fe 3+ ).The electron transtion of the d d layer of the ferric iron and the charge transfer between Fe 2+ and Ti 4+ ,Fe 3+ and Ti 3+ ,O 2- and Fe 3+ are the main factors of charging the colour of Mingxi blue corundums.It is inferred that the concentration difference can become a diffusion power and that the increasing hydrogen content will improve the formation of the blue dispersion factors.If to modify the blue corundum colour by means of the high temperature and high pressure hydrothermal solution,it is possible to take away the parti colour from the blue corundum and to alternate the blue corundum colour up into the simple blue.