Fier, I. [UNESP]Walmsley, L. [UNESP]Souza, J. A.2013-09-302014-05-202013-09-302014-05-202011-10-15Journal of Applied Physics. Melville: Amer Inst Physics, v. 110, n. 8, p. 5, 2011.0021-8979http://hdl.handle.net/11449/25026In polycrystalline BiMn2O5, a broad thermal stimulated depolarization current curve has been observed in the range from 10 K to 300 K and the pyroelectric coefficient determined. In magnetic susceptibility measurements reported in the literature, features appearing in the pyroelectric coefficient could also be identified for the same temperatures, suggesting a connection between electric and magnetic data above the Neel temperature. A detailed study of the dielectric constant from 240 K to 700 K for an extended range of frequencies revealed a broad maximum at low frequencies, characteristic of relaxor ferroelectrics, following Vogel-Fulcher relation. A freezing temperature of the polar nanoregions T-f = 512 K has been determined. This high temperature ferroelectric behavior is attributed to the Bi3+ in the distorted BiO8 cage. (C) 2011 American Institute of Physics. [doi:10.1063/1.3650455]5engArtigo10.1063/1.3650455WOS:000296519900107Acesso abertoWOS000296519900107.pdf