Raman spectroscopic investigations on transition‐metal dichalcogenides MX2 (M = Mo, W; X = S, Se) at high pressures and low temperature
作者： Sandip V Bhatt , MP Deshpande , Vasant Sathe , Rekha Rao , SH Chaki
DOI: 10.1002/JRS.4580
关键词:
摘要: Transition-metal dichalcogenides have been investigated using Raman spectroscopy both being off-resonance and in resonance. The first-order spectra of MoS2, MoSe2, WS2 WSe2 single crystal synthesized by vapor transport technique studied as a function hydrostatic pressure (0–20 GPa) temperature (80–300 K). Isobaric isothermal mode-Gruneisen parameters determined from the pressure-dependent spectra. dependence chalcogen–chalcogen metal–chalcogen force constant has obtained central model. Separation mode wavenumbers into quasi-harmonic purely anharmonic contributions measured high-pressure data allows us to extract changes phonon arising exclusively due interactions. Copyright © 2014 John Wiley & Sons, Ltd.
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