SEMICONDUCTOR CERAMIC MATERIAL AND NTC THERMISTOR

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A NTC thermistor which has superior linearity of resistance-temperature characteristic is provided without depending on a combination of two or more kinds of material but with a single semi-conductive ceramic material. As the semi-conductive ceramic material of negative resistance-temperature characteristic is a ceramic body constituting a NTC thermistor being an oxide expressed by the formula AMnyOz in which y is 0.8 to 1.5, A is a combination of rare earth element and barium and the content of barium in A is 60 to 75 mol % when y=0.8 to 1.5, and 50 to 63 mol % y=1.7 to 2.3, and z is a value which maintains the electric neutrality of the oxide. A preferable oxide is of the formula (La1-αBa α)MnyOz in which when y=0.8 to 1.5, 0.60≤α≤0.75, and when y=1.7 to 2.3, 0.50≤α≤0.63.