STUDY OF THE ELECTRIC-FIELD-INDUCED LOW-TEMPERATURE PHASE IN PB(MP(1 3)NB(2/3))O-3 - TITANIUM INFLUENCE/

The temperature dependence of the dielectric permittivity under a de e lectric field is studied in (1 - x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 ceramics ( 0 less than or equal to x < 0.1). The size of the ordered regions, whi ch is the key parameter to understand the dielectric response of such materials, is suggested to be reduced by Ti doping. A ferroelectric tr ansition can be induced by a field E from the average cubic phase. Whe reas PILIN is a relaxer undergoing a macroscopic phase transition only if E greater than or equal to 4 kV cm(-1), materials with x = 0.1 exh ibit a spontaneous cubic to rhombohedral transition at 280 K on coolin g. Moreover, in all the studied samples, the Tf temperature deduced fr om the Vogel-Fulcher relation is found to be very close to che poling temperature under high field.