Semiconductive ceramic composition and semiconductive ceramic el

Compositions: ceramic – Ceramic compositions – Yttrium – lanthanide – actinide – or transactinide containing

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501126, 501127, 501128, 501153, 501154, 501103, 501105, 252 623T, 361115, 361 27, 361106, C04B 3550, H01C 704

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active

060907355

ABSTRACT:
A semiconductive ceramic composition having negative resistance-temperature characteristics, wherein the composition comprises lanthanum cobalt oxide as the primary component, and, as secondary components, at least one oxide of an element selected from B, Fe and Al and at least one oxide of an element selected from Si, Zr, Hf, Ta, Sn, Sb, W, Mo, Te, Ce, Nb, Mn, Th and P. A semiconductive ceramic composition having a resistivity of approximately 10 .OMEGA..multidot.cm to 100 .OMEGA..multidot.cm at room temperature is obtained by controlling the amount of additives. Since the resistivity at room temperature can be enhanced to several times or more that of the conventional compositions while characteristics of the conventional compositions are maintained, the composition may be widely applied to control heavy current.

REFERENCES:
patent: 5703000 (1997-12-01), Nakayama et al.
V.G. Bhide and D.S. Rajoria, "Mossbauer Studies of the High-Spin-Low-Spin Equilibria and the Localized-Collective Electron Transition in LaCoO.sub.3, " Physical Review B, vol. 6, No. 3, pp. 1021-1032 (Aug. 1, 1972).

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