Schottky defects generate an equal number of

CBSE Class 12 CBSE Class 12 Chemistry
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1

Schottky defects generate an equal number of
cation and anion vacancies while doping produces only cation vacancies and not anion vacancies. Why?

2

Schottky defects exist in pairs to maintain electrical neutrality. So, it generates equal number of cation and anion vacancies. Whereas ionic solids are doped with metal ions of higher valency. Therefore, some cations of lower valency are displaced to maintain electrical neutrality. Hence, only cation vacancies are produced and not anionic.