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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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An ionic compound AB2 possess CaFtype crystal structure. What the co-ordination number of A2+ and B ions in crystal of AB2 explain.

Define dislocation in crystals.

What kind  point defect lowers the density of a crystal?

Explain the term ‘dislocations’ in relation to crystals?

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