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説明
The electric properties of bismuth- and sodium-modified barium titanate, Ba 1=x (Bi 1/2 Na 1/2 ), TiO 3 (BBNT) were studied as a lead-free PTC (positive temperature coefficient of resistivity) thermistor material usable over 130°C. Two semiconductorization processes and their electric properties are described. Lanthanum(La)-doped BBNT ceramics sintered in air still show dielectric behaviors, but Nb-doped ones have a low resistivity ? RT on the order of 103 ?cm at room temperature and show a PTC behaviors. Sintering under low O 2 atmosphere produces BBNT ceramics with less than 102 ?cm compared to those prepared in air. A trial PTC heater constructed using the BBNT semiconducting ceramics demonstrates a comparable performance of those made of the Pb-contained PTC ones. Our current research shows the BBNT ceramics with a switching temperature T s around 210°C by increasing the (Bi 1/2 Na 1/2 ) content x of the ceramics.
収録刊行物
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- 2006 IEEE International Symposium on the Applications of Ferroelectrics
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2006 IEEE International Symposium on the Applications of Ferroelectrics 1-4, 2006-07-01
IEEE