| 光谱学与光谱分析 |
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| Raman Spectrum Study on Turquoise |
| CHEN Quan-li1,QI Li-jian1,CHEN Jing-zhong2</sup |
1. Gemology Institute, China University of Geosciences, Wuhan 430074, China
2. Faculty of Materials Science and Chemical Engineering, China University of Geosciences, Wuhan 430074, China |
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Abstract The Raman spectrum has been employed to discuss the explanation of the structure of water and the vibration of [PO3-4] tetrahedron of the turquoise from Hubei and Anhui province. The Raman spectra are resulted mainly from vibrations of water, hydroxyl units and [PO3-4] tetrahedron of turquoise. The 3 510-3 440 cm-1 bands with the main Raman spectra peak at 3 470 cm-1 were assigned to the ν(OH) stretching vibrations and the 3 290-3 070 cm-1 bands assigned to the ν(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 ν3(PO4) antisymmetric stretching vibrations. And the Raman spectra peaks at 650-540 cm-1 and 500-410 cm-1 were attributed to the ν4 and ν2 bending vibrations of [PO3-4] tetrahedron, respectively. The spectra of the turquoise from different localities are basically similar and subtly different.
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Received: 2007-10-16
Accepted: 2008-01-18
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Corresponding Authors:
CHEN Quan-li
E-mail: chenquanli_0302@163.com
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