![]() ![]() The metal deficiency defect is normally found in Transition Elements, that have the ability to have multiple valencies. Sometimes a positive ion is missing from the lattice site, but the neutrality of the solid will remain same as a neighbouring ion will take up two charges. In such compounds, there is less metal than its ideal stoichiometric proportions. An example of this is when Zinc Oxide is heated and it losses oxygen, But the ultimate result is the excess of metal in the solid. To balance the neutrality an equal number of electrons do the same. These cations fit into the interstitial sites.
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