Compositions – Electrically conductive or emissive compositions – Metal compound containing
Patent
1996-07-17
1998-09-15
Kopec, Mark
Compositions
Electrically conductive or emissive compositions
Metal compound containing
25251952, 25251954, 338 21, 264617, H01B 108, H01C 710, B28B 100, C04B 35453
Patent
active
058075100
ABSTRACT:
A composition for electric material containing as a primary component zinc oxide. The composition further contains at least one of rare-earth elements in a range of 0.01 mol % to 3.0 mol % in terms of oxide thereof given by R.sub.2 O.sub.3 where R represents generally the rare-earth elements, and aluminum in a range of 0.0005 mol % to 0.005 mol % in terms of aluminum oxide given by Al.sub.2 O.sub.3. The composition is suited for manufacturing a resistance element whose varistor voltage can be increased over a whole current range without being accompanied with any appreciable degradation in flatness ratio of a voltage-versus-current characteristic.
REFERENCES:
patent: 4160748 (1979-07-01), Yodogawa et al.
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patent: 4477793 (1984-10-01), Mukae et al.
patent: 5107242 (1992-04-01), Imai et al.
patent: 5277843 (1994-01-01), Imai et al.
Mahan, G.D. et al., Theory of conduction in ZnO varistors, Journal of Applied Phsyics, vol. 50(4), Apr. 1979, pp. 2799-2812.
Furuse Naomi
Kato Tomoaki
Kobayashi Kei-Ichiro
Kobayashi Masahiro
Nakajoh Hiroshi
Kopec Mark
Mitsubishi Denki & Kabushiki Kaisha
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