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Explain metal deficiency defects. |
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Answer» Solution : There are many solids which are difficult to prepare in stoichiometric compositions and contain less amount of the metal as compared to stoichiometric proportion. Metal deficiency defects are generally observed in a compounds of those elements that SHOW variable valency. The metal ions is absent from its lattice site and the electrical neutrality is maintained by a presence of metal in higher oxidation state. A typical example of this type is FeO which is mostly found with a composition of `Fe_(0.95)O` and it may ACTUALLY ranges from `Fe_(0.93)O` to `Fe_(0.96)O`. In a crystals of `FeO`, some `Fe^(2+)` cations are missing and LOSS of positive charge is BALANCED by the presence of required NUMBER of `Fe^(3+)` ions. |
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