THE ONSET OF AN ELECTRIC-FIELD-INDUCED FERROELECTRIC-LIKE PHASE IN THE PEROVSKITE PB(MG1 3NB2/3)O-3/

We study the effect of DC electric field application on a Pb(Mg1/3Nb2/ 3)O-3 ceramic by impedance spectroscopy and depolarization current mea surements. The results indicate the onset of a true ferroelectric phas e, characterized by long-range order, instead of a glassy one. The 'fr eezing' temperature deduced from the Vogel-Fulcher relationship coinci des with the phase transition one, whereas the fitted relaxation frequ ency displays a minimum, as in usual ferroelectrics. The chemical and physical structure of the material is the key parameter to understand the dielectric response which results both from the clusters' dynamics and from their development.