Grain growth kinetics and electrical properties of lanthanum modified lead zirconate titanate (9/65/35) based ferroelectric ceramics

Autor(es)

Roca, R. Alvarez ^{[1, 2]} ; Botero, E. R. ^[2] ; Guerrero, F. ^{[1, 2]} ; Guerra, J. D. S. ^[3] ; Garcia, D. ^[2] ; Eiras, J. A. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Oriente, Fac Ciencias Nat, Dept Fis, Santiago De Cuba 90500 - Cuba

^[2] Univ Fed Sao Carlos, Grp Ceram Ferroeletr, Dept Fis, BR-13565905 Sao Paulo - Brazil

^[3] Univ Fed Uberlandia, Inst Fis, Grp Ferroeletr & Mat Multifuncionais, BR-38400902 Uberlandia, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Physics; v. 105, n. 1 JAN 1 2009.
• Citações Web of Science: 4

Resumo

The influence of the microstructural characteristics on the dielectric and electrical properties has been investigated for Nd(3+) doped lanthanum modified lead zirconate titanate ferroelectric ceramics, obtained by the conventional solid-state reaction method, by taking into account different sintering conditions. The grain growth mechanism has been investigated and a cubic-type grain growth law was observed for samples with grain size varying from 1.00 up to 2.35 mu m. The porosity and grain size dependences of the phase transition parameters, such as the maximum dielectric permittivity and its corresponding temperature (epsilon(m) and T(m), respectively ) were also investigated. The ac conductivity analyses followed the universal Jonscher law. The behavior of the frequency exponent (s) was analyzed through the correlated barrier hopping model. Both ac and dc conductivity results have been correlated with the observed microstructural features. (C) 2009 American Institute of Physics. {[}DOI: 10.1063/1.3063693] (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