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Schottky defects generate an equal numbe...

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

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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.
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ARIHANT PUBLICATION-THE SOLID STATE -PART III (QUESTION FOR PRACTICE) (Short Answer Type I Questions)
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  16. Which stoichiometric defect decreases the density of the crystal?

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