The relaxer ferroelectric properties of the Pb(Mg1/3Nb2/3)(3(1-x))TixO3 (PM
NT) system are presented. The diffuse phase transitions are analyzed using
the Smolenskii-Isupov and the Spin-Glass superparaelectric theories. Dielec
tric permittivity curves as function of temperature and frequency as well a
s the ln f dependence with the reciprocal temperature are reported. The sam
ples were sintered using the conventional ceramic technique.