Compositions: ceramic – Ceramic compositions – Titanate – zirconate – stannate – niobate – or tantalate or...
Reexamination Certificate
2005-08-11
2010-11-02
Group, Karl E (Department: 1793)
Compositions: ceramic
Ceramic compositions
Titanate, zirconate, stannate, niobate, or tantalate or...
C501S137000, C252S520210
Reexamination Certificate
active
07825054
ABSTRACT:
The invention intends to provide, in BaTiO3semiconductor porcelain composition, a semiconductor porcelain composition that, without using Pb, can shift the Curie temperature to a positive direction and can significantly reduce the resistivity at room temperature. According to the invention, when Ba is partially substituted by an A1 element (at least one kind of Na, K and Li) and an A2 element (Bi) and Ba is further substituted by a specific amount of a Q element, or when Ba is partially substituted by an A1 element (at least one kind of Na, K and Li) and an A2 element (Bi) and Ti is partially substituted by a specific amount of an M element, the optimal valence control can be applied and whereby the resistivity at room temperature can be significantly reduced. Accordingly, it is optimal for applications in a PTC thermistor, a PTC heater, a PTC switch, a temperature detector and the like, and particularly preferably in an automobile heater.
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English translation of Search Report issued in International Patent Application No. PCT/JP2005/014769 on Apr. 18, 2006.
Ayumu Aoto et al., “Synthesis and characterization of (Na½Bi½)TiO3- doped BaTiO3semiconductor ceramics,” The Ceramic Society of Japan 2005 Nen Nenkai Koen Yokoshu, Mar. 22, 2005, p. 81.
Matsumoto Kei
Nishikawa Kazuhiro
Shimada Takeshi
Terao Koichi
Toji Kazuya
Group Karl E
Hitachi Metals Ltd.
Stein McEwen, LLP
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