The high electrical conductivity of Bi 4 Ti 3 O 12 (BIT) ceramics is a major problem for the application of these ceramics in high temperature piezoelectric devices. Donor doping is a promising way to reduce the electrical conductivity. This work studies the influence of the addition of P 2 O 5 (5at%) on the microstructural evolution of a BIT ceramic material obtained by a chemical route. p 5 doping controls platelets growth and reduces the electrical conductivity up to a certain sintering temperature.