Question

Account for the following : 

(i) Schottky defects lower the density of related solid.

(ii) Conductivity of silicon increases on doping it with phosphorus.

Answer 1

(i) In Schottky defect, some ions are missing (or due to vacancies) from their normal lattice sites due to which density decreases.

(ii) This is due to availability of unpaired or odd electron provided by P.