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The influence of pressure on the elastic and mechanical properties of the hexagonal transition-metal dichalcogenide WS 2  is investigated using the first-principles calculations. With the increase in pressure, the lattice parameters and the volume of WS 2  decrease, which is exactly in agreement with the available experimental data and other calculated results. The elastic constants  C   ij  , bulk modulus  B , shear modulus  G , Young’s modulus  E , and Poisson’s ratio  σ  of WS 2  also increase with pressure. At last, for the first time, the band gaps of energy, the partial density of states, and the total density of states under three different pressures are obtained and analysed. It is found that the band gap of WS 2  decreases from 0.843 to 0 eV when the external pressure varies from 0 to 20 GPa, which implies that WS 2  may transform from semiconductors to semimetal phase at a pressure about 20 GPa.

Elastic Properties and Electronic Structure of WS 2 under Pressure from First-principles Calculations