湖南金刚石的红外光谱研究

FTIR CHARACTERS OF DIAMOND FROM HUNAN PROVINCE

湖南沅江流域是我国金刚石的重要产地 ,产出的金刚石有多成因、多来源之说。对 1 2 0多粒金刚石的红外光谱和 1 0粒金刚石的显微红外测试结果表明 ,湖南金刚石以 a A和 a AB型为主 ,典型的 a B型较少 ,但 b和 IIa型的比例偏高 ;金刚石含 N量低于 1 0 0× 1 0 -6的占 70 % ;自样品中心到边缘 ,N的聚集类型变化方向明显 ,由 C中心→ A中心 ,A中心→ B中心 ,N与 H的含量变化无一定的规律性 。

The diamond from Yuan River, Hunan Province, an important place of diamond production, is of multiple geneses and sources. The FTIR spectra of 120 rough diamonds and 10 slab diamonds show that most of the diamonds belong to types of IaA and IaAB and few to typical IaB, and that the proportion of types of Ib and IIa is higher slightly than that of other diamonds in other areas. 70% of diamonds contain nitrogen lower than atomic 100×10 -6 . The pattern of nitrogen aggregation changes from Center C to Center A and from Center A to Center B from the core to the rim in diamond. The content of nitrogen and hydrogen in diamond changes unexpectedly from the core to the rim. The changes reflects that the environment in which diamond formed is often variable.