Dielectric response features and oxygen migration on rare earth modified lead titanate ferroelectric ceramics
Nenhuma Miniatura disponível
Data
2009-01-01
Autores
Pelaiz-Barranco, A.
Guerra, J. D. S. [UNESP]
Calderon-Pinar, F.
Arago, C.
Garcia-Zaldivar, O.
Lopez-Noda, R.
Gonzalo, J. A.
Eiras, J. A.
Título da Revista
ISSN da Revista
Título de Volume
Editor
Springer
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.
Descrição
Palavras-chave
Como citar
Journal of Materials Science. New York: Springer, v. 44, n. 1, p. 204-211, 2009.