Raman and infrared spectroscopic investigations of a ferroelastic phase transition in Ba2ZnTeO6 double perovskite.

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Autor(es): dc.creatorMoreira, Roberto Luiz-
Autor(es): dc.creatorLobo, Ricardo P. S. M.-
Autor(es): dc.creatorRamos, Sérgio L. L. M.-
Autor(es): dc.creatorSebastian, Mailadil T.-
Autor(es): dc.creatorMatinaga, Franklin Massami-
Autor(es): dc.creatorRighi, Ariete-
Autor(es): dc.creatorDias, Anderson-
Data de aceite: dc.date.accessioned2025-08-21T15:38:27Z-
Data de disponibilização: dc.date.available2025-08-21T15:38:27Z-
Data de envio: dc.date.issued2019-05-02-
Data de envio: dc.date.issued2019-05-02-
Data de envio: dc.date.issued2018-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/11163-
Fonte completa do material: dc.identifierhttps://journals.aps.org/prmaterials/abstract/10.1103/PhysRevMaterials.2.054406-
Fonte completa do material: dc.identifierhttps://doi.org/10.1103/PhysRevMaterials.2.054406-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1020417-
Descrição: dc.descriptionThe low-temperature vibrational properties of B a 2 ZnTe O 6 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 lowest-frequency Raman mode presents soft-mode behavior and splits below the critical temperature, confirming the in-plane ferroelastic deformation in the low-temperature phase.-
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Idioma: dc.languageen-
Direitos: dc.rightsrestrito-
Título: dc.titleRaman and infrared spectroscopic investigations of a ferroelastic phase transition in Ba2ZnTeO6 double perovskite.-
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