Artigo
Dielectric relaxation and relaxor behavior in bilayered perovskites
Fecha
2009-06-29Registro en:
Applied Physics Letters. Melville: Amer Inst Physics, v. 94, n. 26, p. 3, 2009.
0003-6951
10.1063/1.3168651
WOS:000267697300036
WOS000267697300036.pdf
6725982228402054
Autor
Univ La Habana
Universidade Estadual Paulista (Unesp)
Universidade Federal de Goiás (UFG)
Resumen
Sr(0.5)Ba(0.5)Bi(2)Nb(2)O(9) ferroelectric ceramics exhibit a complex dielectric behavior, showing typical relaxor behavior. The relaxation processes are described by the Cole-Cole model [K. S. Cole and R. H. Cole, J. Chem. Phys. 9, 341 (1941)]. At temperatures below 490 K, the dielectric relaxation is associated to the relaxorlike ferroelectric behavior, resulting from the inhomogeneous distribution of barium due to its preference for the bismuth site. Above that, the interaction between the dipoles, which form the microdomains above the relaxor ferroelectric peak and the electrons, which are due to the ionization of the oxygen vacancies are discussed as the probable origin of the relaxation.