Si^4＋及过渡金属离子在蓝宝石呈色中的作用——数学分析法在离子致色研究中的应用

理想晶体（包括蓝宝石）的颜色与占据其晶格的微量过渡金属元素的种类及含量有直接的关系。玄武岩产状的蓝宝石中含有多种微量元素，这些元素是蓝宝石致色的直接因素。本文通过研究发现，每种微量元素均对可见光的特定波段产生不同程度的吸收，其中，Fe^3 ,Si^4 是使蓝宝石呈现蓝色的主要离子，Cr^3 离子可使蓝宝石呈橙和绿色，Mn^4 离子可使蓝宝石呈黄色，Co^2 离子也可使蓝宝石呈蓝色。本文还做出了蓝宝石中每种微量元素对可见光的特征吸收图即波长－吸收系数图，与分子轨道理论值吻合，把蓝宝石中各离子对可见光的吸收位置和相对吸收强度统一起来。

Effect of Si4+ and Transition Metal Ions in Sapphire Coloring--Application of the Mathematical Method in the Analysis of Coloring by Ions

There is a direct relation between the color of ideal crystals (including sapphire) and the varieties and contents of the trace transition metal ions occupying their lattice. Sapphire occurring in basalt contains multiple kinds of trace transition ions. These ions are direct factor for colouring of sapphire. Each kind of ions can absorb the visible light of a specific spectrum. Fe3+ and Si4+ are the main ions that make sapphire blue, Cr3+ ions can make sapphire green, Mn4+ ions make sapphire yellow, and Co2+ makes sapphire blue. The diagram of characteristic absorption of visible light by each trace element in sapphire, i. e. the wavelength vs. absorbance diagram, has been constructed, which is coincident with the theoretical value and integrates the absorption positions of each ion in sapphire and its relative absorption intensity.