what is metal excess defect?
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A metal excess defect is one of the defects seen in the crystal structures. ... These are the non-stoichiometric inorganic solids that contain constituent elements in non-stoichiometric ration because of the defects in their crystal structures.
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Metal excess defect due to anionic vacancies: This type of defect is exhibited by alkali halides like NaCl and KCl. Application of heat to NaCl in an atmosphere of sodium vapour results in deposition of the sodium atoms on the surface of the crystal
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