Question

The defect when an ion leaves its lattice point and occupies an interstitial position in the crystal lattice is called ------------------

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Answer 1

Frenkel defect diagram.

As we can observe in this diagram sodium ion miss from its lattice site creating vacancy and occupying interstitial position.

So in frenkel defect, cations miss from their lattice points and occupy interstitial voids. Frenkel defect is both vacancy and interstitial defect.