abstract |
A semiconductive ceramic composition having negative resistance-temperaturencharacteristics, wherein the composition comprises lanthanum cobalt oxide as anprimary component, and, as secondary components, at least one oxide of an elementnselected from Fe and Al and at least one oxide of an element selected fromnSi, Zr, Hf, Ta, Sn, Sb, W, Mo, Te, Ce, Nb, Mn, Th, and P. A semiconductive ceramicncomposition having a resistivity of approximately 10 Ω·cm to 100 Ω·cm atnroom temperature is obtained by controlling the amount of additives. Since the resistivitynat room temperature can be enhanced to several times or more that of thenconventional compositions while characteristics of the conventional compositionsnare maintained, the composition may be widely applied to control heavy current. |