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source:Industry News release time:2022-11-10 Hits: Popular:Infrared sensing module
NTC (Negative Temperature Coefficient) refers to the thermistor phenomenon and material with negative temperature coefficient, whose resistance decreases exponentially with temperature rise. This material is a semiconductor ceramic made of two or more metal oxides, such as manganese, copper, silicon, cobalt, iron, nickel, zinc, by fully mixing, molding, sintering and other processes, The thermistor with negative temperature coefficient (NTC) can be made. Its resistivity and material constant change with the proportion of material composition, sintering atmosphere, sintering temperature and structural state. Now there are also non oxide NTC thermistor materials represented by silicon carbide, tin selenide, tantalum nitride, etc.
NTC thermosensitive semiconducting ceramics are mostly oxide ceramics of spinel structure or other structures, with negative temperature coefficient, and the resistance value can be approximately expressed as:
In the formula, RT and RT0 are the resistance values at temperature T and T0 respectively, and Bn is the material constant. The resistivity of ceramic grains changes due to temperature change, which is determined by semiconductor characteristics.
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