what is impurity defects....?
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this is the impurity defect
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ln case if a molten NaCI which contains a little amount of SrCl2 is crystallised, then there we will see that some of the sites of Na+ ions are getting occupied by Sr.
It means that Each Sr is replaced by two Na+ lons. It occupies such that the site of one ion & the rest of the other site remains vacant.
But the cationic vacancies thus which are produced are equal in number as that of Sr²+ ions. There is another example as like this case in the solid solution of CdCl2 & AgCl.
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