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is the abbreviation of
, which means negative temperature coefficient. It generally refers to semiconductor materials or components with a large negative temperature coefficient. The so-called
thermistor is a negative temperature coefficient thermistor. . It is made of metal oxides such as manganese, cobalt, nickel and copper as the main materials
using ceramic technology. These metal oxide materials all have semiconductor properties because their conductive methods are completely similar to semiconductor materials such as germanium and silicon. When the temperature is low, these oxide materials have fewer carriers (electrons and holes), so their resistance value is higher. As the temperature increases, the number of carriers increases, so the resistance value decreases.
The thermistor's variation range at room temperature is
~
, and the temperature coefficient is
~
.
Thermistors can
Thermistors are widely used in temperature measurement, temperature control, temperature compensation, etc.
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The composition of a negative temperature coefficient thermistor
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(
) means that the resistance increases exponentially as the temperature rises Thermistor phenomenon and material with reduced relationship and negative temperature coefficient. This material is made of two or more metal oxides such as manganese, copper, silicon, cobalt, iron, nickel, zinc, etc., which are fully mixed, molded, and sintered. Semiconductor ceramics made by other processes can be made into thermistors with negative temperature coefficients (
>
). Their resistivity and material constants vary with the material composition ratio, sintering atmosphere, sintering temperature and structural state. Changes now include non-oxide systems represented by silicon carbide, tin selenide, tantalum nitride, etc.
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Thermistor materials
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Most of the thermal semiconductor ceramics are oxide ceramics with spinel structure or other structures, which have a negative temperature coefficient.
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History of negative temperature coefficient thermistor
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The development of thermistor has gone through a long period of time. Stage
>
In 2000, scientists discovered for the first time that silver sulfide has a negative temperature coefficient
>
In 2000, scientists discovered that cuprous oxide
>
Oxidation Copper also has a negative temperature coefficient and has been successfully used in temperature compensation circuits for aviation instruments. Subsequently, due to the continuous development of transistor technology, significant progress has been made in the research of thermistors
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Developed
>
Thermistor
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Negative temperature coefficient thermistor temperature range
> >>
Its measurement range is generally
>
~
>+
℃, but it can also be done
>
~
>+
℃, it can even be used for temperature measurement in
>+
~
>+
℃ environment
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The accuracy of the negative temperature coefficient thermistor thermometer can reach
>
℃, and the temperature sensing time can be as short as
>
It is not only suitable for granary thermometers, It can also be used for temperature measurement in food storage, medicine and health, scientific farming, oceans, deep wells, high altitudes, glaciers, etc.