绿松石的激光拉曼光谱研究

Raman Spectrum Study on Turquoise

对湖北、安徽地区绿松石进行了激光拉曼光谱测试分析。结果表明,绿松石中H2O,OH^-及PO4^3-的基团振动是导致其激光拉曼光谱形成的主要原因。3510-3440 cm^-1的谱峰是由ν（OH）伸缩振动所致,其中ν（OH）振动导致的强拉曼特征谱峰在3470 cm^-1附近,ν（H2O）伸缩振动致拉曼谱峰位于3290-3070cm^-1附近的较为宽缓的弱谱峰处;由3ν（PO4）伸缩振动致强拉曼特征谱峰在1200-1030 cm^-1之间,其中3ν（PO4）振动导致的强拉曼特征谱峰在1039 cm^-1附近,4ν（PO4）弯曲振动位于650-540 cm^-1范围,2ν（PO4）的弯曲振动谱峰位于500-410 cm^-1处;不同产地、不同结晶类型的绿松石表现出的拉曼谱峰特征基本一致。

The Raman spectrum has been employed to discuss the explanation of the structure of water and the vibration of [PO4^2- ] tetrahedron of the turquoise from Hubei and Anhui province. The Raman spectra are resulted mainly from vibrations of water, hydroxyl units and [PO4^2-] tetrahedron of turquoise. The 3 510-3 440 cm^-1 bands with the main Rarnan spectra peak at 3 470 cm^-1 were assigned to the v（OH） stretching vibrations and the 3 290-3 070 cm^-1 bands assigned to the v（H2O） stretching vibrations. The bands observed at 1 200-1 030 cm^-1 with the strong peak at 1 039 cm^-1 were assigned to v3 （PO4） antisymmetric stretching vibrations. And the Raman spectra peaks at 650-540 cm ^-1 and 500-410 cm^- 1 were attributed to the v4 and v2 bending vibrations of [PO4^2- ] tetrahedron, respectively. The spectra of the turquoise from different localities are basically similar and subtly different.