Question of 54
Q.When an electron occupies the empty space of negatively charged ions, then the defect in crystal is
(a) Schottky defect
(b) Frenkel defect
(c) F-centre
(d) None of these
Bihar BsebBihar Board Intermediate 2021MCQ· 1mImportance★★★★★
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Start your 14-day free trial to unlock the full solution →An electron trapped in an anion (negative-ion) vacancy is an F-centre, which imparts colour to the crystal.
When a negative ion (anion) is missing from its lattice site and the resulting vacancy is occupied by an electron (to maintain electrical neutrality), the site is called an F-centre (from German 'Farbenzentre' = colour centre).
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