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Frenkel Defect

Dislocation o...

Question

Dislocation of which ion in " $A g^{+} B r^{-}$ " develops Frenkel defect?

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Solution

Dislocation of $A g^{+}$ ion in " $A g$ and $B r$ " develops Frenkel defect. When cation or anion from ionic solid leaves the regular site and moves to occupy a place between the lattice site, Frenkel defect is observed. This defect is also called interstitial defect.

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Q. Assertion :Frenkel defect is also called dislocation defect. Reason: Frenkel defect is shown by ionic substances in which cation and anion are almost similar sizes.

Which kind of defects are introduced by doping?

(a) Dislocation defect (b) Schottky defect

(c) Frenkel defect (d) Electronic defect

Q. (i) Frenkel defect create a vacancy defect at its original site and an interstitial defect at its new position.
(ii) Frenkel defect is stoichiometric point defect.
(iii) Frenkel defect is also called dislocation defect.
(iv) Silver halide shows Frenkel defect
Select the correct statements :

Frenkel defect is also Known as ................

(a) stoichiometric defect (b) dislocation defect

(c) impurity defect (d) non-stoichiometric defect

Q. In AgBr crystal, the ion size lies in the order

A g^{+} << B r^{-}

. On the basis of the given information only, the AgBr crystal should have the following characteristics

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