What do you mean by ‘point defects' in crystals?

Point defects are caused by missing or misplaced ion or atom in the crystal lattice i.e., deviation from regular arrangement of ions/ particles in the crystal.
Point defects can be classified into three types : (i) stoichiometric defects (ii) impurity defects and (iii) non-stoichiometric defects.
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Define dislocation in crystals.

crystal defect. Line defects, or dislocations, are lines along which whole rows of atoms in a solid are arranged anomalously. The resulting irregularity in spacing is most severe along a line called the line of dislocation. Line defects can weaken or strengthen solids.
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What kind  point defect lowers the density of a crystal?


Schottky defect lowers the density of a crystal.
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Explain the term ‘dislocations’ in relation to crystals?

Crystal defect. Line defects, or dislocations, are lines along which whole rows of atoms in a solid are arranged anomalously. The resulting irregularity in spacing is most severe along a line called the line of dislocation. Line defects can weaken or strengthen solids.
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An ionic compound AB2 possess CaFtype crystal structure. What the co-ordination number of A2+ and B ions in crystal of AB2 explain.

CaF is partof bcc inwhich the Ca2+ is located at the body centred Fis located atthe corners of the unit cell thus co-ordination numberof Ca2+ is 8 and co-ordination number of Fis 4. similarly in AB  The co-ordination number of A2+ is 8, whereas B- ion co-ordination number is 4.
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