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Raman scattering of 2H
at simultaneous high temperature and high pressure (up to 600 K and 18.5 GPa)
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The Raman spectroscopy of natural molybdenite powder was investigated at simultaneous conditions of high temperature and high pressure in a heatable diamond anvil cell(DAC), to obtain the temperature and pressure dependence of the main Raman vibrational modes (E1g,,A1g, and 2LA(M)). Over our experimental temperature and pressure range (300–600 K and 1 atm−18.5 GPa), the Raman modes follow a systematic blue shift with increasing pressure, and red shift with increasing temperature. The results were calculated by three-variable linear fitting. The mutual correlation index of temperature and pressure indicates that the pressure may reduce the temperature dependence of Raman modes. New Raman bands due to structural changes emerged at about 3–4 GPa lower than seen in previous studies; this may be caused by differences in the pressure hydrostaticity and shear stress in the sample cell that promote the interlayer sliding.
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