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Impurity Defect

Define Frenke...

Question

Define Frenkel defect in solid crystal.

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Solution

This defect arises in a crystal when an ion, generally cation, leaves its lattice site and occupies an interstitial site so that electrical neutrality as well as stoichiometry is maintained.

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Q. Assertion :Due to Frenkel defect, density of the crystalline solid decreases. Reason: In Frenkel defect, cation or anion leaves the crystal.

Q. Assertion :Due to Frenkel defect, there is no effect on the density of the crystalline solid. Reason: In Frenkel defect, no cation or anion leaves the crystal.

Q. Explain Schottky and Frenkel defects in solids.

Q. Assertion :Frenkel defect increases the dielectric constant of the solid. Reason: In Frenkel defect like charge ions come closer.

Q. Frenkel defect is found in crystals in which the radius ratio is:

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