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Title: Raman and Infrared Spectroscopic Investigations of a Ferroelastic Phase Transition in Ba2ZnTeO6 Double Perovskite
Authors: Moreira, R L
Lobo, R P S M
Ramos, S L L M
Sebastian, T M
Matinaga, F M
Ariete Righi
Dias, A
Issue Date: 16-May-2018
Publisher: American Physical Society
Citation: Physical Review Materials, 2(5):054406
Abstract: The low-temperature vibrational properties of Ba2ZnTeO6 double-perovskite ceramics obtained by the solid-state route were investigated by Raman scattering and Fourier-transform infrared reflectivity. We found that this material undergoes a reversible ferroelastic phase transition at around 140 K, well compatible with a recently proposed rhombohedral-to-monoclinic structural change that would occur below 165 K. Complementary calorimetric measurements showed that the phase transition has a first-order character, with an entropy jump compatible with a displacive mechanism. The vibrational spectra show clearly the splitting of the doubly degenerate E modes into nondegenerate representations of the low-symmetry phase. In particular, the lowestfrequency Raman mode presents soft-mode behavior and splits below the critical temperature, confirming the in-plane ferroelastic deformation in the low-temperature phase.
Appears in Collections:2018

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