Compositions – Electrically conductive or emissive compositions – Metal compound containing
Patent
1988-11-07
1990-01-30
Dixon, Jr., William R.
Compositions
Electrically conductive or emissive compositions
Metal compound containing
252521, 501136, 501137, 501138, 501139, H01B 108, C03C 3546
Patent
active
048972193
ABSTRACT:
It is a voltage-dependent non-linear resistance ceramic composition comprising SrTiO.sub.3 as host material, Dy.sub.2 O.sub.3 or Dy.sub.2 O.sub.3 and Nb.sub.2 O.sub.5 or Ta.sub.2 O.sub.5 or Ta.sub.2 O.sub.5 and Nb.sub.2 O.sub.5 as accelerating agent for semiconductorization, thereby changing crystal to a low resistance, and changing crystal boundary to a high resistance.
In case Dy.sub.2 O.sub.3 or Dy.sub.2 O.sub.3 and Nb.sub.2 O.sub.5 are used as the accelerating agent for semiconductorization, one kind or more selected from the group consisting of Na, K, Ca, Cd, In, Ba, Pb, Ag, Ce, La, Sc, Y, Cs, Au, Mg, Zr, Sn, Sb, W, Bi, Ni, Fe, Ga, Pt, Tl, Al, Si, Be, Li, Eu, Gd, Tb, Tm, Lu, Th, Ir, Os, Hf and Ru. Alternatively, in case Ta.sub.2 O.sub.5 or Ta.sub.2 O.sub.5 and Nb.sub.2 O.sub.5 are used as the accelerating agent for semiconductorization, one kind or more selected from the group consisting of Na, K, Ca, Cd, In, Ba, Pb, Mg, Zr, Sn, Sb, W, Bi, Eu, Gd, Tb, Tm, Lu, Th, Ir, Os, Hf, Ru, Ga, Pt, Tl, La, Sc, Y, Cs, and Au.
As a result, baristor characteristic is obtainable by means of the high resistance at crystal boundaries and capacitor between crystal granules--crystal boundary--crystal granule.
From this matter, an element having both functions of the baristor characteristics and the capacitor characteristics are obtainable, and performs effect in surge absorption and noise elimination.
REFERENCES:
patent: 3268783 (1966-08-01), Saburi
patent: 4403236 (1983-09-01), Mandai et al.
Ebine Kazuhide
Kumazawa Kimiko
Noi Keiichi
Takami Akihiro
Dixon Jr. William R.
Group Karl
Matsushita Electric - Industrial Co., Ltd.
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