SEMICONDUCTOR CERAMIC AND POSITIVE TEMPERATURE COEFFICIENT THERMISTOR

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PROBLEM TO BE SOLVED : To provide a semiconductor ceramic allowing to suppress variation of resistance values among products while keeping appropriate high Curie point even with small amount of alkali metal elements and Bi contained therein. SOLUTION : This semiconductor ceramic comprises BamTiO3-based composition having a perovskite type structure expressed by general formula AmBO3 as a main component, where a part of Ba constituting the A site is substituted by alkali metal elements, Bi, Ca and rare earth elements; the total content of the alkali metal elements and the Bi is 0.02-0.09 in terms of molar ratio when the total number of moles of elements constituting the A site is made 1 mole; and the content of the Ca is 0.05-0.20 (preferably 0.125-0.175) in terms of molar ratio when the total number of moles of elements constituting the A site is made 1 mole. In the PTC thermistor, the body 1 of parts is formed of the above semiconductor ceramic. COPYRIGHT : (C)2010, JPO&INPIT