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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Journal of Materials Science; v. 44, n. 1, p. 204-211, JAN 2009.
• Citações Web of Science: 11

Resumo

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)

• 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