Fabrication of High-Curie-Point Barium-Lead Titanate PTCR Ceramics |
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Authors: | Shiang-Hua Wang Ford-Son Hwang Tseung-Yuen Tseng |
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Affiliation: | Institute of Electronics, College of Engineering, National Chiao-Tung University, Hsinchu, Taiwan, Republic of China |
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Abstract: | High-Curie-point semiconducting barium-lead titanate positive temperature coefficient of resistivity (PTCR) ceramics of composition Ba0.897Pb0.1La0.003TiO3 and Ba0.5Pb0.5La0.003TiO3 were prepared. The starting powders were synthesized by reacting commercial BaTiO3, PbO, and TiO2. To avoid the nonstoichiometry due to the volatilization of Pb during the sintering process, a lead atmosphere sintering approach with PbTiO3 as packing powder was used. The samples being fabricated by this method show a PTCR effect of 3 to 4.5 orders of magnitude above the Curie point. The curie points were about 180°C for Ba0.897Pb0.1La0.003TiO3 and about 360°C for Ba0.497Pb0.5La0.003TiO3. |
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Keywords: | electrical properties lead titanate barium titanate Curie temperature sintering |
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