锆石型NdVO和白钨矿型PrVO在高压下的晶格动力学
Lattice dynamics of zircon-type NdVOand scheelite-type PrVOunder high-pressure.
作者信息
Marqueño T, Pellicer-Porres J, Errandonea D, Santamaria-Perez D, Martinez-Garcia D, Rodríguez-Hernández P, Muñoz A, Nieves-Pérez I, Achary S N, Bettinelli M
机构信息
Departamento de Física Aplicada-ICMUV, Universidad de Valencia, Dr. Moliner 50, Burjassot, 46100 Valencia, Spain.
Departamento de Física, Instituto de Materiales y Nanotecnología, Universidad de La Laguna, La Laguna 38200, Tenerife, Spain.
出版信息
J Phys Condens Matter. 2021 Oct 29;34(2). doi: 10.1088/1361-648X/ac2f6e.
Zircon-type NdVOand scheelite-type PrVOhave been studied by means of Raman spectroscopy up to approximately 20 GPa. In the first compound, zircon-scheelite and scheelite-fergusonite phase transitions are reported at 6.4(3) and 19.6(4) GPa, respectively. In the case of scheelite-type PrVO, a reversible phase transition to a PbWO-III structure is observed at 16.8(5) GPa. In both cases, a scheelite-type structure is recovered in a metastable state at low pressures. The pressure evolution of the Raman modes is also reported. Our experimental findings are supported bycalculations, which allowed us to discuss the role of mechanic and dynamical instabilities in the phase transition mechanisms.
通过拉曼光谱对锆石型 NdVO 和白钨矿型 PrVO 进行了研究，压力高达约 20 GPa。在第一种化合物中，分别报道了在 6.4(3) GPa 和 19.6(4) GPa 时发生锆石 - 白钨矿和白钨矿 - 弗格森矿相变。对于白钨矿型 PrVO，在 16.8(5) GPa 时观察到向 PbWO - III 结构的可逆相变。在这两种情况下，在低压下均以亚稳态恢复白钨矿型结构。还报道了拉曼模式的压力演变。我们的实验结果得到了计算的支持，这使我们能够讨论力学和动力学不稳定性在相变机制中的作用。
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