蓝宝石3310cm—1红外吸收峰的鉴定意义

本文对不同处理的蓝宝石及天然蓝宝石进行红外吸收光谱研究 ,结合蓝宝石的形成条件 ,发现 :(1)天然山东蓝宝石中普遍存在 3310cm- 1 的红外吸收峰 ,这与山东蓝宝石形成于还原环境有关 ;(2 )其他产地的蓝宝石是否存在 3310cm- 1 的红外吸收峰与其形成时的氧化还原条件有关 ;(3)经氧化热处理的蓝宝石中不存在 3310cm- 1 的红外吸收峰 ;(4 )扩散法处理的蓝宝石中是否存在 3310cm- 1 的红外吸收峰视其方法而定。因此 ,作者认为 :结合形成环境和处理方法 ,3310cm-

IR Spectroscopic Absorption Band near 3310cm-1 in Sapphire and Its Identification Significance

The identification of a heated sapphire is a difficult problem for gemmologists. In market, jewelers needn't to remark the heated sapphire because there is no key identical proof for it and such a heated sapphire is commonly accepted by people. Never the less,spectroscopy shows that natural sapphirs formed in reduced condition, such as sapphires from Shandong,have absorption bands near 3 310 cm -1 and so do sapphires heated in the reduction condition caused by hydrogen. Not all the surface diffusion treated sapphires will produce such absorption bands. Finally, the encouraging fact is that such absorption bands will vanish if the sample is heated in oxidizing atmosphere. This fact seemsto be an important proof for gemmologists to identify this kind of sapphires.