山东蓝宝石的呈色机制

ON THE MECHANISM OF COLORATION OF SAPPHIRE FROM SHANDONG PROVINCE, CHINA

本文采用电子探针、顺磁共振、吸收光谱等手段,着重研究了山东蓝宝石的吸收光谱特征,讨论了它的呈色机制,并简单论述了其改色的可能性。20000～10000cm^(-1)范围内的电荷转移跃迁是造成蓝宝石不同色调和颜色的主要原因,Fe^(2+)-Ti^(4+)、Fe^(2+)-Fe^(3+)、Fe^(3+)及O^(2-)-Fe^(3+)等吸收峰(带)的强弱和相对强弱决定了蓝宝石的具体颜色。如何协调这几个吸收峰的吸收强度是蓝宝石改色的关键。

The absorption spectral characteristics of sapphire from Shandong and the mechanism of coloration of natural sapphire have been studied with EPA, EPR absorption spectrum techniques. The possibility of color change of sapphires is also discussed in the present paper.The color and tone of natural sapphire are due to the charge transfer at 20000～10000cm^(-1). The color of sapphire depends mainly on the strength and relative strength of bands for Fe^(2+)—Ti^(4+), Fe^(2+)—Fe^(3+), O^(2-)—Fe^(3+) and Fe^(3+). The adjustment of the strength of these bands is the key to changing sapphire's color.