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- Dielectric response features and oxygen migration on rare earth modified lead titanate ferroelectric ceramics
- Univ La Habana
- Universidade Estadual Paulista (UNESP)
- Univ Autonoma Madrid
- Universidade Federal de São Carlos (UFSCar)
- Third World Academy of Sciences
- Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
- Latin-American Network of Ferroelectric Materials
- TWAS: RG/PHYS/LA No. 99-050
- TWAS: 02-225
- TWASciences: 05-043
- FAPESP: 06/60013-5
- 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.
- Journal of Materials Science. New York: Springer, v. 44, n. 1, p. 204-211, 2009.
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