What are F-centres in an ionic crystal ?

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Due to presence of unpaired electrons.

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Calculate the coordination number in an ionic crystal, when the radius ratio of cation to anion is 0.3

What are point defects in crystals ? Describe the Schottky defects in crystals.

What do you understand by imperfections in ionic crystals ? Name the types of imperfections which occur in ionic crystals.

Frenkel defect does not change the density of the ionic crystal whereas, Schottky defect lowers the density of ionic crystal. Give a reason.

Schottky defect lowers the density of ionic crystals while Frenkel defect does not. Why?