On heating a crystal of KCl in potassium vapour, the crystal starts exhibiting a violet colour.
Why?
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This happens due to creation of F-centers, as a result of Chloride anion vacancy created upon heating KCl in excess of K vapours. The hole created by the chloride anion is filled by an electron from K, giving it violet appearance.
nakul199:
Does this cause metal excess defect?
yes it said to be as metal excess defect
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