what is point defect theory
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An interstitial defect is formed when a foreign (solute) atom is positioned in the crystal structure at a point that is normally unoccupied (Fig. 4.6). The defect is formed when a solute atom such as an alloying or impurity element sits within a gap between the crystal lattice points of the base metal (solvent)
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A vacancy is a point defect where an atom is missing from its normal site in the crystal structure Vacancies are created by the displacement of the atoms because lattice points in the crystal structure are left unoccupied by atoms of the base metal or substitutional element.
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