期刊
JOURNAL OF MATERIALS SCIENCE
卷 44, 期 1, 页码 204-211出版社
SPRINGER
DOI: 10.1007/s10853-008-3100-5
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资金
- Third World Academy of Sciences [RG/PHYS/LA No. 99-050, 02-225, 05-043]
- FAPESP Brazilian agency [06/60013-5]
- ICTP
- Latin-American Network of Ferroelectric Materials
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 Ti4+ 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.
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