0
Why does the electrical conductivity of pure metal decrease with temperature while that of semiconductors increases?
Wiki User
∙ 10y ago
The conductivity depends on the passage of charged particles especially electrons. In metals electrons are easily available in conduction band and so its conductivity is high. As we increase the temperature then core of atoms vibrate largely. So with positive charge it could easily minimize the electrons in the conduction band and hence fall in conductivity
In case of semiconductor there will be usually forbidden gap between valence band and conduction band. So conduction is poor at ordinary temperature. But as we increase temperature that would allow electrons to reach conduction band as covalent bonds get broken. Hence higher conductivity
Wiki User
∙ 10y ago
Add your answer:
Earn +20 pts
How semiconductors behaves at absolute temperature?
As temperature increases the resistance of semiconductors decreases. This means that semiconductors have a negative temperature coefficient.
How will molar conductivity vary with concentration or temperature?
molar conductivity involves concentration of electrolyte also....but electrolytic conductivity doesn't
Why does dielectric constant decrease with an increase in temperature?
If the temperature increases, the conductivity will increase too which means the dielectric constant is reduced
How does temperature effect semiconductors?
Firstly a general rule: Too hot fries anything.(and lesser important: too cold and you get superconduction) Resistors For normal resistors: as temperature increases, the electrical resistance decreases.Though specially made heat sensitive resistors with the opposit effect (for temperature measurements) do exist.
Can temperature effect the conductivity of material?
Not sure, in my 9th standard (level of Indian standard education),we studied about conductors....."when temperature increases conductivity of a conductor is also increases". but it is not true in all case because of the properties of the conductors. in some case ...'temperature increase the resistance of a conductor increases so conductivity decreases '. for example: in olden days electronic equipments is more efficient when the atmospheric temperature increases or presence of heat .
Do metals increase electrical conductivity with increasing temperature?
Yes, it does; exactly how it affects the conductivity depends on the metal. As a general rule conductors become LESS conductive as the temperature goes up, while semiconductors become MORE conductive as the temperature goes up.
Why sodium chlorides electrical conductivity is increases with increase in temperature?
Solid sodium chloride is neutral.
What is the effect of temperature on transistor?
conductivity of semiconductors increases with increase in temperature as breakdown of covalent bonds take place in the semiconductor due to increase in temp but more & more increase in the temp may result in the breakdown or damage of the semiconductor which results in the decrease in conductivity of semiconductor
How semiconductors behaves at absolute temperature?
As temperature increases the resistance of semiconductors decreases. This means that semiconductors have a negative temperature coefficient.
Which element increases its electrical conductivity as its temperature increases?
Silicon because it is an intrinsic semiconductor.
How will molar conductivity vary with concentration or temperature?
molar conductivity involves concentration of electrolyte also....but electrolytic conductivity doesn't
If an iron rod is heated to a high temperature how would it effect its conductivity?
Generally speaking conductivity of metals decreases as the temperature increases.
When a soluble metallic salt is added to water its electrical conductivity decreases?
No. Its electrical conductivity increases because the positive and negative ions of the salt dissociate in the water.
Which conducts electricity better a hot piece of steel or a cold piece of steel?
The electrical conductivity of a metal generally decreases with increasing temperature. Inversely, the electrical conductivity of a semi-conductor increases with increasing temperature.Source: UK GCSE (high school) science education.
If the electrical conductivity in an electrical circuit decreases then the brightness of the light bulb does what?
Then the brightness of the light buld increases.
What are the advantage of semiconductor over conductor?
semiconductors are the conducors they are partially conduct electricity. And we can increase therir conductivity by using various method . They are Intrinsic method and extrinsic method . Intrinsic method is heating the semiconducter . Extrinsic method is doping. By using this method the conductivity of semiconductors is rapidly increases. Then we use semiconductors are prefferd to conductors
What does it mean for a substance to be semiconductor?
A substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities. :) Hope that helped;)
