Temperature evolution of the Fano line shape in the Raman spectra of BaTiO3 nanoparticles

The Fano line shape at about 185 cm(-1) is observed in temperature-dependent Raman spectra of BaTiO3 nanoparticles. The dip structure appears at the low-energy side, indicating a positive asymmetric parameter q, which is assigned to the interference between a central peak from the quasi-elastic scattering mode and the A(TO) vibrational mode around 180 cm(-1). Furthermore, the relation between the phase change of BaTiO3 nanoparticles and the Fano line shape is discussed. This work deepens the understanding of the mechanism underlying the Fano line shape in Raman spectral and provides a powerful strategy to characterize phase change of the nanostructured BaTiO3.

Automated summary

The Fano line shape at around 185 cm(-1) is observed in temperature-dependent Raman spectra of BaTiO3 nanoparticles. The dip structure on the low-energy side indicates a positive asymmetric parameter q, which is attributed to the interference between the central peak from quasi-elastic scattering mode and the A(TO) vibrational mode around 180 cm(-1). Furthermore, the relationship between the phase change of BaTiO3 nanoparticles and the Fano line shape is discussed. This work deepens the understanding of the mechanism underlying the Fano line shape in Raman spectra and provides a powerful strategy to characterize the phase change of nanostructured BaTiO3.