draw a neat labelled diagramto show excess defect in a crystall due to anionic vacancies
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anion vacancies:
In this defect, a negative ion is missing from its lattice site, leaving behind a hole that is occupied by an electron and maintain the electrical balance.
The sites which contain the electrons are trapped in the anion vacancies.
They are known as F-centres because they are responsible for giving color to the crystal.
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