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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Phase transition and dielectric properties of La-doped Pb(Zr, Ti)O-3 antiferroelectric ceramics

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Autor(es):
Pelaiz-Barranco, A. [1] ; Guerra, J. D. S. [2] ; Garcia-Zaldivar, O. [1] ; Calderon-Pinar, F. [1] ; Mendoza, M. E. [3] ; Hall, D. A. [4] ; Araujo, E. B. [5]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Univ La Habana, Fac Fis, Inst Ciencia & Tecnol Mat, Havana 10400 - Cuba
[2] Univ Fed Uberlandia, Inst Fis, Grp Ferroelect & Mat Multifuncionais, BR-38400902 Uberlandia, MG - Brazil
[3] Univ Autonoma Puebla, Inst Fis, Puebla 72570 - Mexico
[4] Univ Manchester, Sch Mat, Manchester M1 7HS, Lancs - England
[5] Univ Estadual Paulista, UNESP, Dept Quim & Fis, BR-15385000 Ilha Solteira, SP - Brazil
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: Solid State Communications; v. 149, n. 31-32, p. 1308-1311, AUG 2009.
Citações Web of Science: 6
Resumo

Lanthanum modified lead zirconate titanate (PLZT) ceramics with a Zr/Ti (90/10) ratio were investigated for a 7 and 8 at% lanthanum content by dielectric spectroscopy, the Sawyer-Tower polarization technique and x-ray diffraction measurements. The ceramics were obtained using a standard ceramic method, showing an anti ferroelectric (orthorhombic) phase (Pbam). Electric field dependence of polarization (P-E) studies revealed slim-like hysteresis loop characteristics. The temperatures corresponding to the maximum real and imaginary parts of the dielectric permittivity were not only coincident, but also shown to be frequency independent. Results on dielectric response suggest a thermodynamic phase transition rather than a dipole glass/relaxor ferroelectric transition. On the other hand, the Curie temperature (T(C)) was found to be negative. Using Landau's theory considerations, the obtained results have been interpreted in terms of an antiferroelectric-paraelectric (AFE-PE) phase transition. (C) 2009 Elsevier Ltd. All rights reserved. (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