Semiconductor ceramic composition and method for producing...

Details Semiconductor ceramic composition and method for producing... Semiconductor ceramic composition and method for producing...

2007-10-26

2011-12-13

Lorengo, Jerry (Department: 1731)

Compositions: ceramic

Ceramic compositions

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

C501S137000, C501S139000

Reexamination Certificate

active

08076256

ABSTRACT:
It is intended to provide a Pb-free semiconductor ceramic composition capable of shifting its Curie temperature toward a positive direction and capable of enhancing its jump characteristic while minimizing the increase in the resistivity at room temperature. There is provided a semiconductor ceramic composition in which a part of Ba of BaTiO3is substituted with Bi—Na, the semiconductor ceramic composition being obtained by sintering a mixed calcined powder containing a calcined BT powder containing a calcined powder of (BaR)TiO3or a calcined powder of Ba(TiM)O3(in which R and M each are a semiconductor dopant), and a calcined BNT powder containing a calcined powder of (BiNa)TiO3; in which BaCO3and/or TiO2is/are added to the calcined BT powder or the calcined BNT powder or to the mixed calcined powder.

REFERENCES:
patent: 7700509 (2010-04-01), Shimada et al.
patent: 2009/0036293 (2009-02-01), Shimada et al.
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patent: 2005255493 (2005-09-01), None
patent: WO 2006/106910 (2006-10-01), None
Huo et al. Effects of Bi1/2Na1/2TiO3 on Curie temperature and the PTC effects of BaTO3-based positive temperature coefficient ceramics. Sensors and Actuators A, Feb. 20, 2006, 128 (2006) 265-269.
Huo et al., “Effects of Bi1/2Na1/2TiO3on the Curie temperature and the PTC effects of BaTiO3-based positive temperature coefficient ceramics,”Sensors and Actuators A, vol. 128 (2006), pp. 265-269.

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