Normal 0 false false false Se examino la transicion de fases para los sistemas xAgI-(1-x)LiI y xAgI-(1-x)NaI (x = 0.8 Y 0.6), empleando espectroscopia de impedancias (EI) en el rango de frecuencias de 100 a 10 6 Hz y calorimetria diferencial de barrido (DSC) en un rango de temperaturas de 300 a 430 K. Se observo en el sistema dopado con Li+ una disminucion en la temperatura a la cual ocurre la transicion de fase comparada con el AgI puro, directamente proporcional a la concentracion del dopante, mientras que ocurrio lo contrario con el sistema dopado con Na+. Los sistemas ionicos basados en AgI se caracterizan por presentar inestabilidad en sus estructuras en el rango de temperaturas de 390 a 420 K. Normal 0 false false false The phase transition was examined for the xAgI-(1-x)LiI and xAgI-(1-x)NaI (x = 0.8 Y 0.6) systems, using impedance spectroscopy (IS) in the range of frequencies between 100 and 10 6 Hz and differential scanning calorimetry (DSC) in a range of temperatures from 303 to 430 K. We observed in the system doped with Li + a decrease in the temperature at which the phase transition occurs compared with the pure AgI, directly proportional to the concentration of the dopant whereas the opposite happens with the system doped with Na + . The ionic systems based on AgI are characterized for instability present in their structures in the range of temperatures from 390 to 420 K, thanks to the change of phase transition α - b , which is first order and the associated latent heat.