Phonon spectra of pure and acceptor doped BaZrO3 investigated with visible and UV Raman spectroscopy

Laura Mazzei, Dieter Rukser, Florian Biebl, Benjamin Grimm-Lebsanft, Gerd Neuber, Daniele Pergolesi, Lars Börjesson, Michael A Rübhausen, Jakob Andreasson, Maths Karlsson
2020 Journal of Physics: Condensed Matter  
We report results from visible and UV Raman spectroscopy studies of the phonon spectra of a polycrystalline sample of the prototypical perovskite type oxide BaZrO3 and a 500 nm thick film of its Y-doped, proton conducting, counterpart BaZr0.8Y0.2O2.9. Analysis of the Raman spectra measured using different excitation energies (between 3.44 eV and 5.17 eV) reveals the activation of strong resonance Raman effects involving all lattice vibrational modes. Specifically, two characteristic energies
more » ... e identified for BaZrO3, one around 5 eV and one at higher energy, respectively, and one for BaZr0.8Y0.2O2.9, above 5 eV. Apart from the large difference in spectral intensity between the non-resonant and resonant conditions, the spectra are overall similar to each other, suggesting that the vibrational spectra of the perovskites are stable when investigated using an UV laser as excitation source. These results encourage further use of UV Raman spectroscopy as a novel approach for the study of lattice vibrational dynamics and local structure in proton conducting perovskites, and open up for, e.g., time-resolved experiments on thin films targeted at understanding the role of lattice vibrations in proton transport in these kinds of materials.
doi:10.1088/1361-648x/ab95d1 pmid:32628643 fatcat:woa3ahzsnvdtrd55ew36ygsxcq