Question
Why does zinc oxide exhibit enhanced electrical conductivity on heating?
Solution
Zinc oxide is white in colour at room temperature. On heating it loses oxygen and turns yellow.On heating, zinc oxide loses oxygen
The excess zinc ions are accomodated in interstitial sites with electrons trapped in the neighbourhood. The enhanced conductivity is due to these trapped electrons.
The excess zinc ions are accomodated in interstitial sites with electrons trapped in the neighbourhood. The enhanced conductivity is due to these trapped electrons.
