| 光谱学与光谱分析 |
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| Raman Spectra of Aragonite at the Pressure of 0.1~2 GPa and Ambient Temperature |
| FU Pei-ge, ZHENG Hai-fei* |
| Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, Peking University, Beijing 100871, China |
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Abstract Raman spectra of aragonite were studied at ambient temperature and pressure of 0.1～2 GPa in a moissanite anvil cell using Raman spectrum technique. The relations between the Raman shifts of aragonite and the system pressure are given as follows: ν153(cm-1)=0.003 5p(MPa)+154.0, ν206=0.006 0p+206.3, ν704=0.002 1p+704.2, ν1 085=0.003 5p+1 085.3. No phase transition occurred in aragonite within the range of experimental pressure. Similar to other carbonate minerals (magnesite, dolomite), the measured relative pressure-shift of the Raman line of the symmetric stretching vibration of aragonite is greater at 0.1-2 GPa than at ultrahigh pressure, which indicates that the C—O bond compressibility of the CO3 groups is related to the pressure, and it is more compressible at 0.1～2 GPa than at higher pressure.
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Received: 2010-05-08
Accepted: 2010-09-23
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Corresponding Authors:
ZHENG Hai-fei
E-mail: hfzheng@pku.edu.cn
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