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US 6,469,612 B2Granted
Semiconductor ceramic having a negative temperature coefficient of resistance and negative temperature coefficient thermistor
AssigneeMurata Manufacturing Co., Ltd.
InventorsAkinori Nakayama, Satoshi Fujita
Life of this patent
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Abstract
A semiconductor ceramic having a negative temperature coefficient of resistance, the element comprising about 0.1 to 20 mol % of AMnO3 (A represents at least one of Ca, Sr, Ba, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy and Ho) and to a spinel composite oxide made of a solid solution of Mn and at least one element in Ti, V, Cr, Fe, Co, Ni, Cu, Zn, Mg and Al. As a perovskite Mn composite oxide, one or more of CaMnO3, SrMnO3, BaMnO3, LaMnO3, PrMnO3, NdMnO3, SmMnO3, EuMnO3, GdMnO3, TbMnO3, DyMnO3 and HoMnO3 may be used.
Claims12
A semiconductor ceramic having a negative temperature coefficient of resistance, comprising:
- a spinel composite oxide comprising a solid solution of Mn and at least one element selected from the group consisting of Ti, V, Cr, Fe, Co, Ni, Cu, Zn, Mg and Al;
- and
- about 0.1 to 20 mol % of AMnO3, wherein A is at least one member selected from the group consisting of Ca, Sr, Ba, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy and Ho.
Dependencies are inferred from the claim text.