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http://hdl.handle.net/1843/55437| Type: | Artigo de Periódico |
| Title: | Raman and infrared spectroscopic investigations of a ferroelastic phase transition in Ba2ZnTeO6 double perovskite |
| Authors: | Roberto Luiz Moreira Ricardo P. S. M. Lobo Sérgio L. L. M. Ramos Mailadil Thomas Sebastian Franklin Massami Matinaga Ariete Righi Anderson Dias |
| Abstract: | The low-temperature vibrational properties of Ba2 ZnTeO6 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. |
| Subject: | Espalhamento Transições de fases Espectroscopia de Raman |
| language: | eng |
| metadata.dc.publisher.country: | Brasil |
| Publisher: | Universidade Federal de Minas Gerais |
| Publisher Initials: | UFMG |
| metadata.dc.publisher.department: | ICX - DEPARTAMENTO DE FÍSICA |
| Rights: | Acesso Restrito |
| metadata.dc.identifier.doi: | https://doi.org/10.1103/PhysRevMaterials.2.054406 |
| URI: | http://hdl.handle.net/1843/55437 |
| Issue Date: | 2018 |
| metadata.dc.url.externa: | https://journals.aps.org/prmaterials/abstract/10.1103/PhysRevMaterials.2.054406 |
| metadata.dc.relation.ispartof: | Physical Review Materials |
| Appears in Collections: | Artigo de Periódico |
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