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In materials science, point defects are imperfections localized at or around a single lattice point in a crystal. These defects significantly influence the mechanical, electrical, and thermal properties of materials. The primary types of point defects include vacancies, interstitials, and substitutional defects. A vacancy defect occurs ___ _________ ______ ____ ____ ____ ____ ___ __________ _____ _________ ___.
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