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Pressure-induced instability in CdO

机译:CdO中压力引起的不稳定性

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摘要

The lattice dynamics of rocksalt CdO is studied as a function of pressure using density-functional linear-response theory. The predicted static phase-transition pressure from rocksalt (B1) to CsCl (B2) structures is 76.12 GPa. Analysis of the phonon calculations suggests that the pressure-induced instabilities at p=78.26 GPa of the transverse acoustic (TA) modes in a large portion of the Brillouin zone are responsible for the phase transition from B1→B2 phases of CdO. Moreover, the calculated partial phonon density of states at the precursor phase transition of p=70 GPa reveals strong reduction of the longitudinal acoustic Cd-like modes and the existence of a large peak related to the longitudinal optic O-like mode.
机译:利用密度泛函线性响应理论研究了岩盐CdO的晶格动力学与压力的关系。从岩石盐(B1)到CsCl(B2)结构的预测静态相变压力为76.12 GPa。对声子计算的分析表明,在大部分布里渊区中,横向声(TA)模在p = 78.26 GPa处的压力诱导的不稳定性是CdO从B1→B2相的相变的原因。而且,在p = 70GPa的前体相变处所计算的部分声子密度显示出纵向声学Cd样模式的强烈降低以及与纵向光学O样模式有关的大峰的存在。

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