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Título: | Characterization of SrBiMn2−xTixO6 perovskites: Local ordering influence on the dielectric and magnetic response |
Autor: | Alonso-Domínguez, D.; Álvarez-Serrano, I.; López, M. L.; Cuello, G. J.; Asensio, Eloy CSIC ORCID; García-Hernández, Mar CSIC ORCID ; Veiga, M. L.; Pico, C. | Palabras clave: | Perovskites Dielectrics Neutron diffraction Relaxor Ferroelectrics |
Fecha de publicación: | 1-ago-2016 | Editor: | Elsevier | Citación: | Ceramics International 42(10): 11889-11900 (2016) | Resumen: | Two new phases in the (SrTiO)-(BiMnO) perovskite type system were studied. These SrBiMnTiO (x=0.5 and 0.75) ceramics were prepared by the liquid-mix method as polycrystalline powders. They were characterized by neutron diffraction (ND), electrical and magnetic measurements and these results were analysed in connection with the x=0.25 phase, previously described by us. Their crystal structures were fitted in the tetragonal I4/mcm space group, with additional superstructure reflections suggesting local ordering. Electron microscopy results revealed these ordering effects are actually present concerning both perovskite sublattices. The electrical response pointed to a mechanism consisting in variable range hopping of polarons. A relaxor ferroelectric behaviour dependent on the pellets thickness was found with T in the 140–240 K range. The magnetic structures imply an incommensurable modulation of the magnetic moments along the c or a directions, depending on the substitution degree x. A cluster picture in terms of chemically different nanoregions responsible of the macroscopic response is discussed. | Versión del editor: | https://doi.org/10.1016/j.ceramint.2016.04.111 | URI: | http://hdl.handle.net/10261/186109 | DOI: | 10.1016/j.ceramint.2016.04.111 | Identificadores: | doi: 10.1016/j.ceramint.2016.04.111 issn: 0272-8842 |
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