| abstract |
Semi-conductor ceramic compsns. of Ba titanate series, useful as a electronic components, e.g. thermistors, and activated by addn. of >=1 rare earth, Sb, Bi, Nb or Ta, are admixed with 0.001-0.5 wt. % V before firing. Positive temp. resistivity coefficient can be raised 105 times and specific resistance at room temp. can easily be adjusted to any desired value. Further addn. of 0.05-1.5 wt. % SiO2 lowers temp. at which Ba titanate compsn. is made semi-conductive and also suppresses quick changes in specific resistance of semi-conductor at room temp. |