An electron trapped in an anion site in a crystal is called:
A
f-center
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B
frenkel defect
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C
schottky defect
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D
interstitial defect
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Solution
The correct option is D f-center
An F-center is a type of crystallographic defect in which an anionic vacancy in a crystal is filled by one or more unpaired electrons. Electrons in such a vacancy tend to absorb light in the visible spectrum such that a material that is usually transparent becomes colored.