Compositions – Electrically conductive or emissive compositions – Metal compound containing
Patent
1987-02-09
1989-06-13
Dixon, William R.
Compositions
Electrically conductive or emissive compositions
Metal compound containing
252521, 501136, H01B 106, C04B 3546
Patent
active
048390976
ABSTRACT:
This is a voltage-dependent non-linear resistance ceramic composition wherein resistance of crystal is decreased by containing SrTiO.sub.3 as host material, and Nb.sub.2 O.sub.5 and Ta.sub.2 O.sub.5 as semiconductorization accelerating agent, and further by adding as additive one kind or more oxide of element selected from the group consisting of MnO.sub.2, Ga, Pt, Tl, Si, Ti, Li, La, Cu, Y, Cs, Au, Mo, S, Be, Al, Na, K, Ca, Cd, In, Ba, Pb, Eu, Gd, Tb, Tm, Lu, Th, Ir, Os, Hf, Ru, Mg, Zr, Sn, Sb and W, these additive is segregated at crystal granule boundaries, thereby making the crystal granule boundaries to high resistance.
Accordingly, by the high resistance layer at the crystal boundaries the varistor characteristic is obtainable, and a capacitance characteristic is obtainable between the crystal granule-crystal granule boundary-crystal granule.
From this, an element having both functions of the varistor characteristics and the capacitor characteristics are obtainable, and performs effect in surge absorption and noise elemination.
REFERENCES:
patent: 4519942 (1985-05-01), Yamaoka et al.
patent: 4541974 (1985-09-01), Yamaoka et al.
patent: 4545929 (1985-10-01), Masuyama et al.
patent: 4547314 (1985-10-01), Masuyama et al.
Ebine Kazuhide
Kumazawa Kimiko
Noi Keiichi
Takami Akihiro
Bosco Ann M.
Dixon William R.
Matsushita Electric - Industrial Co., Ltd.
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