Name one ionic solid,which shows both Frenkel defect and Schotty defects.

Discuss Frenkel defect.

Frenkel defect is noticed in:

Calcium metal crystallises in a face centred cubic lattice with edge length of 0.556 nm. Calculate the density of the metal if it contains (i) 0.2% Frenkel defects (ii) 0.1% Schottky defects

........ is an example of ionic compound which shows Schottky defect.

Give comparison between Schottky defect and Frenkel defect.