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There are several kinds of semiconductor ceramics
thermal-sensitive ceramic
Also known as thermistor ceramic, refers to the conductivity with temperature changes significantly ceramic. There are three types: ① Negative temperature coefficient thermistor (NTC), such as oxide semiconductor ceramics of some transition metals such as manganese, iron, cobalt, nickel, etc., is characterized by an exponential decrease in resistance as temperature increases. The positive temperature coefficient thermistor (PTC), such as doped barium titanate semiconductor ceramics, is characterized by increasing resistance with increasing temperature, and the Curie point has a drastic change. The drastic change type thermistor (CTR), such as vanadium oxide and its doped semiconductor ceramics, has a negative temperature coefficient, and at a certain temperature, the resistance has a sharp change, the change value can reach 3 to 4 orders of magnitude. Thermosensitive ceramics are mainly used for temperature compensation, temperature measurement, temperature control, fire detection, overheat protection and demagnetization of color TV sets.
photosensitive ceramic
Refers to a ceramic with a photoconductive or photovoltaic effect. Such as cadmium sulfide, cadmium telluride, gallium arsenide, indium phosphide, bismuth germanate ceramic or single crystal. The conductance increases when light strikes its surface. Mainly used as automatic control of the light switch and solar cells. Semiconductor ceramics.
gas sensitive ceramic
Refers to a ceramic whose conductivity varies with the type of gas molecules in contact. Such as zinc oxide, tin oxide, iron oxide, vanadium pentoxide, zirconium oxide, nickel oxide and cobalt oxide system of ceramics. It is mainly used for leak detection, disaster prevention alarm and measurement of different gases.
humidity sensitive ceramic
Refers to a ceramic whose conductivity changes significantly with humidity. Such as iron oxide, titanium oxide, potassium oxide-iron oxide, magnesium chromate-titanium oxide and zinc oxide-lithium oxide-vanadium oxide system of ceramics. Their conductivity is particularly sensitive to water and is suitable for humidity measurement and control.
Control systems have become increasingly systematic, requiring multi-functional sensitive components that can detect two or more physical and chemical parameters and give non-interfering electrical signals. Multifunctional sensitive ceramics such as humidity-gas sensitive ceramics and temperature-humidity sensitive ceramics are being developed to meet this need.
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