Semiconductor ceramic composition

Details Semiconductor ceramic composition Semiconductor ceramic composition

2007-02-27

2011-11-29

Lorengo, Jerry A (Department: 1731)

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

C501S137000

Reexamination Certificate

active

08067325

ABSTRACT:
It is intended to provide a semiconductor ceramic composition containing no Pb, which is capable of shifting the Curie temperate to a positive direction as well as of controlling room temperature resistivity and having an excellent jump characteristic. Since the semiconductor ceramic composition in which a portion of Ba of BaTiO3is substituted by Bi—Na has a crystal in which a central part and an outer shell part of a crystal grain are different from each other in composition, the composition is capable of improving control of room temperature resistivity and a jump characteristic, and therefore it is optimum as a material for a PTC thermistor, a PTC heater, a PTC switch, a temperature detector, and the like.

REFERENCES:
patent: 6231779 (2001-05-01), Chiang et al.
patent: 7090785 (2006-08-01), Chiang et al.
patent: 2009/0219666 (2009-09-01), Fukuda
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patent: 2005-255493 (2005-09-01), None
patent: WO 2006/106910 (2006-10-01), None
patent: WO 2006/118274 (2006-11-01), None

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