Polarized Raman spectroscopy of nearly tetragonal BiFeO3 thin films

Article

关键词: CERAMICS;   

DOI  :  10.1103/PhysRevB.82.014107

来源: SCIE

【 摘 要 】

BiFeO3 thin films can be epitaxially stabilized in a nearly tetragonal phase under a high biaxial compressive strain. Here we investigate the polarized Raman spectra of constrained BiFeO3 films with tetragonal-like (BFO-T), rhombohedral-like (BFO-R), and multiphase (BFO-T+R) structure. Based on analysis of the number and symmetry of the Raman lines, we provide strong experimental evidence that the nearly tetragonal films are monoclinic (Cc symmetry) and not tetragonal (P4mm). Through the Raman mapping technique we show localized coexistence of BFO-T and BFO-R phases with the relative fraction dependent on the film thickness.

【 授权许可】

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