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Which of the following statements regarding defects in crystalline solids is correct?

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Schottky defects exist in non-ionic substances and does not affect density of substance.

Frenkel defects increases the dielectric constant.

Introduction of impurity defect in Si by insertion of Al will create n-type semiconductors.

The formation of wurtzite is an example of metal excess defect.

answer is B.

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Detailed Solution

In Frenkel defect, ions in solid dislocate from their position. Hence, Frenkel defect is a dislocation defect.

When a cation occupies an interstitial site instead of its proper location in the lattice, a Frenkel defect is produced. The Frenkel defect's tendency to bring the charge close together helps to raise the crystal's dielectric constant.

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