Question

what is metal excess defect.?​

Answer 1

Answer:

what is metal excess defect.?

By anion vacancies:

In this defect, a negative ion is missing from its lattice site, leaving behind a hole which is occupied by an electron and maintain the electrical balance.

Metal excess defect may also cause by extra cations which occupy the interstitial sites.

Nonstoichiometric inorganic solids contain the constituent elements in a non-stoichiometric ratio due to defects in their crystal structures.

These defects are of two types:

(i) metal excess defect

(ii) metal deficiency defect.

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Answer 2

$\huge\underline\mathfrak{Answer}$

Metal excess defect:It is a defect in the ionic solids where deviation from the usual structure is occurred due to the absence of the metallic ion from the two lattice points.

$\underline\mathfrak{Extra\:Information}$

Let's take an example:

If a crystal of Nacl is heated in the sodium vapour!It changes it's colour gets yellow.

It is due to the non-stoichiometric compound of the sodium chloride.