Abstract
Ab initio phonon calculations on CdS are performed to probe the high pressure structural behaviors. We predicted an unstable transverse acoustic (TA) mode for NaCl-CdS (B1) and a phase transition of B1→Pmmn driven by this soft mode is thus identified, excluding probable high pressure Cmcm phase. Furthermore, a softening TA phonon mode at the zone boundary M point of CsCl-CdS (B2) is predicted, which results in the phase transition from Pmmn to tetrahedral P4/nmm (B10). Enthalpy calculation reveals that Pmmn phase becomes energetically more favorable than the B1 phase over 51.2 GPa, and B10 phase is stable in a pressure range of 80.3–85.5 GPa, above which B10 phase will decompose into Cd and S.
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