In-situ Raman Spectroscopic Study of Serpentine Using Diamond Anvil Cell
LIU Jin, SUN Qiang*
School of Earth and Space Sciences, Peking University and Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, Beijing 100871, China
Abstract：Within the diamond anvil cell, the Raman spectroscopic study of serpentine was operated at room temperature and under pressures from 1 atm to 5 140 MPa. This study analyzed the pressure dependence of the low-frequency Raman vibrational modes of sepentine at 388, 471, 692 and 705 cm-1 respectively. The vibrational modes of inner OH groups at 3 664 cm-1 and inter-layer OH groups at 3 696 cm-1 shifted linearly with the increasing pressures. The pressure-related slope of 3 664 cm-1 was 3.3 cm-1·GPa-1. The vibrational mode at 3 696 cm-1 of the inter-layer hydroxyl shifted upwards with the pressure-related slope 8.3 cm-1·GPa-1 up to 2.0 GPa, and then with 1.1 cm-1·GPa-1 from 2.0 GPa to ca. 5.0 GPa. It could be interpreted that the hydrogen bond of the inter-layer hydroxyl made dominant contribution to such experimental phenomena. In addition, the dehydration of serpentine did not occur under such conditions.
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