Resumen de Dielectric relaxation in Pb(Fe2/3W1/3)O3 ceramics
Liquin Zhou, Paula M. Vilarinho, J.L. Baptista
Lead iron tungstate, Pb(Fe2/3Wy3)03 (PFW), exhibits typical ferroelectric relaxor characteristics around 185K (lOkHz). Besides the ferroelectric relaxation, a second dielectric relaxation was observed in undoped, La'^^ and Mn^+ doped PFW ceramics in the temperature range of 200-350K. The intensity of dielectric permittivity and loss factor peaks was found to be strongly related to the resistivity: it increases with the increase in the resistivity. The relaxation activation energy is also in the same range of the condution activation energy for each sample. The relaxation mechanism is discussed and a space charge polarization is suggested to explain the observed dielectric relaxation.
