The resistivity of tungsten wire is affected by many factors, mainly including the following aspects:
Purity: The purity of tungsten wire has an important influence on its resistivity. There are fewer impurities in high-purity tungsten wire, and the movement of electrons is less hindered, so the resistivity is relatively low. On the contrary, if the tungsten wire contains more impurities, its resistivity will increase accordingly. This is because the impurity atoms will interfere with the normal movement of electrons inside the tungsten wire, thereby increasing the resistance.
Temperature: Temperature is one of the key factors affecting the resistivity of tungsten wire. As the temperature increases, the vibration of atoms inside the tungsten wire intensifies, and the probability of collision between electrons and atoms increases, which will lead to an increase in resistivity. Therefore, in practical applications, it is necessary to fully consider the effect of temperature on the resistivity of tungsten wire. However, there is also a view that under certain circumstances (such as during tungsten wire drawing), the increase in temperature may cause the resistance of tungsten wire to decrease, which may be related to the specific experimental conditions or the state of tungsten wire. But in general, under normal conditions, the increase in temperature will cause the resistivity of tungsten wire to increase.
Stress: When tungsten wire is subjected to external force, its resistivity will also change. Under stress, the atomic arrangement inside the tungsten wire changes, affecting the movement path of electrons, resulting in a change in resistivity. This change may vary depending on the direction and magnitude of the stress.
Grain size: Grain size is also one of the factors that affect the resistivity of tungsten wire. Generally speaking, the smaller the grain size, the greater the resistance. This is because small grains mean more grain boundaries, which are obstacles to the movement of electrons, thus increasing resistance.
Doping elements: After adding doping elements to tungsten wire, its resistivity will also change. The addition of most doping elements will reduce the resistivity of tungsten wire. This is because doping elements can change the electronic structure inside the tungsten wire, thereby affecting its conductive properties.
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