Why does zinc oxide exhibit enhanced electrical conductivity on heating?

On heating, zinc oxide loses oxygen

On heating, zinc oxide loses oxygenThe excess zinc ions are accomodat

The excess zinc ions are accomodated in interstitial sites with electrons trapped in the neighbourhood. The enhanced conductivity is due to these trapped electrons.
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In a body centred unit cell, one of the diagonals contains two extra atoms. Find the number of atoms present per unit cell?

In a body centred unit cell diagonal contain two extra atom .so in per unit cell  = 8×18+2=3.

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An element occurs in the bcc structure. How many atoms are present in its unit cell explain ?

body centre wholly belongs to the unit cell in which it is present. Thus in a body-centered cubic (bcc) unit cell:
(i) 8 corners × 1/8 per corner atom 8×1/8 = 1 atom
(ii) 1 body centre atom = 1 × 1 = 1 atom
∴ Total number of atoms per unit cell = 2 atoms.
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What are lattice defects imperfection?


lattice defect can be define as combination of Line defects and plane defects together are called lattice defects.
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What is the number of atoms per unit cell in a body centred cubic structure?

The number of atoms per unit cell in a body centred cubic structure = 2.
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