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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Dielectric response features and oxygen migration on rare earth modified lead titanate ferroelectric ceramics

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Author(s):
Pelaiz-Barranco, A. [1] ; Guerra, J. D. S. [2] ; Calderon-Pinar, F. [1] ; Arago, C. [3] ; Garcia-Zaldivar, O. [1] ; Lopez-Noda, R. [4] ; Gonzalo, J. A. [3] ; Eiras, J. A. [5]
Total Authors: 8
Affiliation:
[1] Univ La Habana, Fac Fis Inst Ciencia & Tecnol Mat, Havana 10400 - Cuba
[2] Univ Estadual Paulista, Dept Quim & Fis, BR-15385000 Ilha Solteira, SP - Brazil
[3] Univ Autonoma Madrid, Fac Ciencias, Dept Fis Mat, E-28049 Madrid - Spain
[4] ICIMAF, Dept Fis Aplicada, Havana 10400 - Cuba
[5] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Journal of Materials Science; v. 44, n. 1, p. 204-211, JAN 2009.
Web of Science Citations: 11
Abstract

Rare earth (RE) and manganese-modified lead titanate ceramics were studied concerning the presence of two peaks in the temperature dependence of the dielectric permittivity. An eventual incorporation of the RE into A-site and/or B-site in the perovskite structure and the oxygen migration were considered as causes of the observed phenomenon. The structural analysis showed that at least a small amount of Ti(4+) could be substituted by the RE ions. It was considered from the pyroelectric and electrical conductivity results that, even when an eventual incorporation of the RE into the A-site and/or B-site of the structure could be possible, both peaks could not be associated with paraelectric-ferroelectric (PE-FE) phase transitions. The observed peak at lower temperatures has been associated with the PE-FE phase transitions, whereas the hopping of oxygen vacancies has been considered as the cause for the dielectric anomaly observed at higher temperatures. (AU)