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First-principles study of the pressure-induced phase transition in CaTiO_3

机译:CaTiO_3中压力诱导的相变的第一性原理研究

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An investigation into the phase stabilities of CaTiO_3 under high pressure was conducted using first-principles calculations based on density functional theory. We have identified three candidate structures of CaTiO_3, Pbnm, Pm3m and Cmcm, respectively. Our results demonstrate that a phase transition from orthorhombic (Pbnm) to cubic (Pm3m) is impossible for CaTiO_3 under high pressure at ambient temperature, and further predict that Pbnm-CaTiO_3 will transform to post-perovskite phase (Cmcm) at enough temperature and pressure.
机译:基于密度泛函理论,利用第一性原理对CaTiO_3在高压下的相稳定性进行了研究。我们已经确定了CaTiO_3,Pbnm,Pm3m和Cmcm的三个候选结构。我们的结果表明,CaTiO_3在常温高压下不可能从正交晶(Pbnm)转变为立方(Pm3m),并且进一步预测,在足够的温度和压力下,Pbnm-CaTiO_3将转变为钙钛矿后相(Cmcm)。 。

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