Dielectric relaxation and relaxor behavior in bilayered perovskites
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Data
2009-06-29
Autores
Gonzalez-Abreu, Y.
Pelaiz-Barranco, A.
Araujo, E. B. [UNESP]
Franco Junior, A.
Título da Revista
ISSN da Revista
Título de Volume
Editor
American Institute of Physics (AIP)
Resumo
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.
Descrição
Palavras-chave
barium compounds, bismuth compounds, dielectric relaxation, electric domains, ferroelectric ceramics, relaxor ferroelectrics, strontium compounds, vacancies (crystal)
Como citar
Applied Physics Letters. Melville: Amer Inst Physics, v. 94, n. 26, p. 3, 2009.