Abstract
The positive temperature coefficient (PTC) effect of ceramics has been widely used in temperature sensors, protective switches and so on, which requests large positive temperature coefficients in narrow region above the curie-point temperature and low resistivities below the curie-point temperature. At present, PTC thermistors are fabricated by means of doping the BaTiO_3 to produce a PTC effect by the existence of accep.tor states or elec
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