Question

any one tell about metal deficiency deffect with suitable example​

Answer 1

hello dear I m attempt your questions after some time with a suitable example

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Answer 2

Please refer this link: https://amazingsolids.wordpress.com/2013/06/15/non-stoichiometric-defects/

Metal Deficiency Defects

These contain less number of positive ions than negative ions. These arise due to two ways:

(i)  Cation Vacancies: In some cases, the positive ions may be missing from their lattice sites. The extra negative charge may be balanced by some nearby metal ion acquiring two positive charges instead of one. This type of defect is possible in metals which show variable oxidation states.

The common examples of compounds having this defect are ferrous oxide, ferrous sulphide, nickel oxide etc.

(ii) Extra anions occupying interstitial sites: In the case, the extra anions may be occupying interstitial positions. The extra negative charge is balanced by the extra charges on the adjacent metal ions. Such type of defect is not common because the negative ions usually very large and they cannot easily fit into the interstitial sites.

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