Question

define point defects​

Answer 1

Point defects are where an atom is missing or is in an irregular place in the lattice structure. Point defects include self interstitial atoms, interstitial impurity atoms, substitutional atoms and vacancies. ... An example of interstitial impurity atoms is the carbon atoms that are added to iron to make steel.

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Answer 2

point defects:

point defects are irregularities produced in the arrangement of basis at lattice points in crystalline solid.