Domain wall contribution to dielectric and piezoelectric responses in 0.65Pb(Mg1/3Nb2/3)-0.35PbTiO(3) ferroelectric ceramics

Autor(es)

Garcia, J. E. ^[1] ; Guerra, J. D. S. ^[2] ; Araujo, E. B. ^[3] ; Perez, R. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Politecn Cataluna, Dept Appl Phys, ES-08034 Barcelona - Spain

^[2] Univ Fed Uberlandia, Grp Ferroeletr & Mat Multifuncionais, Inst Fis, BR-38400902 Uberlandia, MG - Brazil

^[3] Univ Estadual Paulista, Dept Fis & Quim, BR-15385000 Ilha Solteira, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHYSICS D-APPLIED PHYSICS; v. 42, n. 11 JUN 7 2009.
• Citações Web of Science: 10

Resumo

In this paper, the contribution of the domain walls motion to the dielectric and piezoelectric responses for the 0.65Pb(Mg1/3Nb2/3)O-3-0.35PbTiO(3) system is investigated. A monotonically increasing temperature dependence of the dielectric permittivity is observed from very low temperatures up to the ferroelectric-paraelectric phase transition temperature. It is verified that the major contribution to dielectric response at room temperature is from the extrinsic effect. A linear dependence of the permittivity with the amplitude of the ac applied electric field is verified from the nonlinear dielectric measurement. Rayleigh's model is used to quantitatively evaluate the dielectric response, leading to similar behaviour of the typical soft PZT. On the other hand, direct piezoelectric response also displays a Rayleigh-type behaviour. Piezoelectric measurements show in the entire investigated dynamic stress range a decrease in the piezoelectric response with both increase in frequency of the applied dynamic stress and increase in the pre-stress on the samples. (AU)

• Processo FAPESP: 07/00183-7 - Síntese, caracterização e fenomenologia de cerâmicas e filmes nanoestruturados do sistema ferroelétrico PMN-PT
• Beneficiário: Eudes Borges de Araújo
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 06/60013-5 - Investigação das propriedades dielétricas lineares e não lineares em materiais ferroelétricos (cerâmicos e filmes finos)
• Beneficiário: José de los Santos Guerra
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores