Semiconductor ceramics refer to ceramics with semiconductor properties and a conductivity of about 10-6 ~ 105/m. The conductivity of semiconductor ceramics changes significantly due to changes in external conditions (temperature, light, electric field, atmosphere, temperature, etc.). Therefore, changes in physical quantities of the external environment can be converted into electrical signals and made into sensitive components for various purposes.
1. Thermal-sensitive ceramics: also known as thermistor ceramics, refer to ceramics whose conductivity changes significantly with temperature. Thermal semiconductor ceramic tubes, Thermal ceramics are mainly used for temperature compensation, Temperature measurement, temperature control, fire detection, overheating protection and color TV degaussing, etc.
2. Photosensitive ceramics: refers to ceramics with photoconductive or photovoltaic effects. Such as cadmium sulfide, cadmium telluride, gallium arsenide, indium phosphide, bismuth germanate and other ceramics or single crystals. The conductance increases when light strikes its surface. Mainly used as semiconductor ceramics for automatic control of optical switches and solar cells.
3. Gas-sensitive ceramics zirconia semiconductor ceramics
Gas-sensitive ceramics: refers to ceramics whose conductivity changes with the type of gas molecules they come into contact with. Ceramics such as zinc oxide, tin oxide, iron oxide, vanadium pentoxide, zirconium oxide, nickel oxide and cobalt oxide. Mainly used for leak detection, disaster prevention alarm and measurement of different gasesQuantity, etc.
4. Humidity-sensitive ceramics: refers to ceramics whose conductivity changes significantly with humidity. Such as ferric oxide, titanium oxide, potassium oxide-iron oxide, magnesium chromate-titanium oxide and zinc oxide-lithium oxide-vanadium oxide and other system ceramics. Their conductivity is particularly sensitive to water, making them suitable for humidity measurement and control.
