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Sintering and properties of highly donor-doped barium titanate ceramics
Authors:S Urek  M Drofenik  D Makovec
Affiliation:(1) Ceramics Department, ldquoJozcaronef Stefanrdquo Institute, Jamova 39, 1111 Ljubljana, Slovenia
Abstract:The electrical properties of donor (La3+) doped BaTiO3 samples with a donor concentration in the range from 0.3 to 1.5 mol.% of La were studied. Samples were sintered at a low partial pressure of oxygen in order to facilitate anomalous grain growth and donor incorporation. In order to optimise the PTCR anomaly, the samples were annealed in air at 1100°C. Results show that with the use of a specific sintering profile PTCR ceramics containing an amount of donor dopant >0.3 mol.%, can be prepared. Heavily doped samples which do not exhibit anomalous grain growth show a core shell structure.
Keywords:
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