What type of defect can arise when a solid is heated? Which physical property is affected by it and in what way?

In the $AgBr$ crystal,the size of ions follows the order $Ag^{+} << Br^{-}$. Which of the following characteristics is shown by $AgBr$?

Schottky defect generally appears in

Explain the defects arising due to anionic vacancies and due to the presence of extra cations in the interstitial sites.

$A$ silicon specimen is made into a $p-$type semiconductor by doping,on an average,one indium atom per $5 \times 10^7$ silicon atoms. If the number density of atoms in the silicon specimen is $5 \times 10^{28} \ \text{atoms} \ m^{-3}$,then the number of acceptor atoms in silicon per cubic centimeter will be

When $NaCl$ (molten) is doped with $10^{-5} \, mol \, \%$ of $AlCl_3$,what is the concentration of cation vacancies?