Characterization of SrBiMn2−xTixO6 perovskites: Local ordering influence on the dielectric and magnetic response. Issue 10 (1st August 2016)

• Record Type: Journal Article
• Authors: Alonso-Domínguez, D.; Álvarez-Serrano, I.; López, M.L.; Cuello, Gabriel J.; Asensio, Eloy; García-Hernández, Mar; Veiga, M.L.; Pico, C.
• Is Part Of: Ceramics international. Volume 42:Issue 10(2016)
• Page Start: 11889
• Page End: 11900
• Publication Date: 2016-08-01
• Subjects: Perovskites -- Dielectrics -- Neutron Diffraction -- Relaxor Ferroelectrics; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.04.111
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Two new phases in the (SrTiO3 )-(BiMnO3 ) perovskite type system were studied. These SrBiMn2−x Tix O6 ( 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 I 4/ 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 m 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.