Frenkel defect|Types of non stoichiometric defect

In an ideal crystal, the entropy of the constituents at absolute zero temperature (0K) is zero. However, the crystals generally suffer from certain defects also called imperfections They may be both electronic and atomic in nature. The atomic imperfections may be stoichiometric (Schottky and Frenkel defects) or non-stoichiometric (metal excees and metal deficiency defects). In addition to these, there are impurity defects which are caused by the addition of certain impurities of metals and this is known as dopping. The dopping leads to semi conductors which may be either n-type or p-type in nature. In stoichiometric defects, the ratio of positive and negative ions as indicated by chemical formula of the compound:

Bragg''''s Equation,Defects or imperfections in Solids Schottky and Frenkel Defects, Non Stoichiometric Defects,Magnetic Properties,Piezoelectricity and Pyroelectricity

Defects are basically irregularities in the arrangement of constituent particles. Broadly speaking the defects are of two types. Namely point defects and line defects. Point defects: The irregularities or deviations from ideal arrangement around a point or an atom in the crystalline substance. Line defects : The irregularities or deviations from ideal arrangement in enitre row of lattice points. Answer the following questions. Select the correct statements : (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 alos called dislocation defect. (iv) Silver halide shows Frenkel defect.

In Frenkel defect

Assertion (A) Both Frenkel and Schottky defects are stoichiometric defects. Reason (R ) Both defects change the density of the crystalline solid.

Defects in ionic solid|Types of stoichiometric defects|Schottky defect

Frenkel defect is not shown by:

What type of non-stoichiometric point defect is responsible for the pink colour of LiCl ?

Due of Frenkel defect