Pressure-Dependent Structure of BaZrO₃ Crystals as Determined by Raman Spectroscopy.

ABSTRACT: The structure of dielectric perovskite BaZrO₃, long known to be cubic at room temperature without any structural phase transition with variation in temperature, has been recently disputed to have different ground state structures with lower symmetries involving octahedra rotation. Pressure-dependent Raman scattering measurements can identify the hierarchy of energetically-adjacent polymorphs, helping in turn to understand its ground state structure at atmospheric pressure. Here, the Raman scattering spectra of high-quality BaZrO₃ single crystals grown by the optical floating zone method are investigated in a pressure range from 1 atm to 42 GPa. First, based on the analyses of the infrared and Raman spectra measured at atmospheric pressure, it was found that all the ob

SUBMITTER: Gim DH 

PROVIDER: S-EPMC9228820 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature