The growing interest in disordered relaxor ferroelectrics is due to unusual properties mainly related to the existence of broad phase transitions characteristic to the systems. The effects of bias field on the dielectric response and polarisation switching are studied in the 0.5 PbNi1/3Nb2/3O3-x PbTiO3-(0.5-x) PbZrO3system at different PbTiO3:PbZrO3ratio. Thermal behaviour of normalised remnant polarisation Pr/Pmaxof compositions with content of lead titanate x =0.33 and x =0.35 at frequency 0.1 Hz and different values of field Eoare measured. Results of measured polarisation and depolarisation currents are compared with characteristics of polarisation switching. In the case of composition with x =0.33 the value of Pr/Pmaxdoes not depend on the field amplitude in the range 4-10 kV/cm within the thermal interval from 50 to 135 °C. In composition with x =0.35 the interval of Pr/Pmaxindependent of Eo(5-10 kV/cm) is observed closer to the temperature of dielectric permittivity maximum Tm≈180 °C © 2003 Elsevier Ltd. All rights reserved.
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