Modeling the dielectric response of lanthanum modified lead zirconate titanate ferroelectric ceramics-an approach to the phase transitions in relaxor ferroelectrics

Autor(es)

Garcia-Zaldivar, O. ^[1] ; Pelaiz-Barranco, A. ^[1] ; Calderon-Pinar, F. ^[1] ; Fundora-Cruz, A. ^[1] ; Guerra, J. D. S. ^[2] ; Hall, D. A. ^[3] ; Mendoza, M. E. ^[4]

Afiliação do(s) autor(es)

^[1] Univ La Habana, Inst Ciencia & Tecnol Mat, Fac Fis, Havana 10400 - Cuba

^[2] Univ Estadual Paulista, Dept Quim & Fis, BR-15385000 Ilha Solteira, SP - Brazil

^[3] Univ Manchester, Sch Mat, Manchester M1 7HS, Lancs - England

^[4] Univ Autonoma Puebla, Inst Fis, Puebla 72570 - Mexico

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHYSICS-CONDENSED MATTER; v. 20, n. 44 NOV 5 2008.
• Citações Web of Science: 9

Resumo

The relaxor behavior of lanthanum modified lead zirconate titanate (PLZT) ferroelectric ceramics, for a La/Zr/Ti ratio of x/60/40, has been analyzed. An approximation to the dynamical behavior of the polar nano-regions (PNRs) has been discussed, taking into account a relaxation model, which considers a distribution function for the relaxation times. A good agreement between theoretical and experimental results was obtained. The behaviors of the mean relaxation time and its standard deviation with temperature were discussed, considering the correlation between the polar nano-regions and the freezing temperature. The temperature dependence of the polarization showed an anomalous behavior around a temperature, which was associated with the freezing temperature, according to the proposed model in the present work. (AU)

• 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