Present work deals with ionic conductivity measurements of system (UP03)l-x - (LiI)x where 0.2  x  0.9 mole. Measurements carried out between 1000C and 5000C using the method of complex impedance. Results obtained indicate a large increase of conductivity due to the doping effect by LiI. A maximum conductivity appears at x = 0.8 corresponding to a minimum activation energy (Eo = 0.42 eV). 


A M AL RIKABI ,