Structural and Dielectrics Properties of (1-x)Pb(Fe_(2/3)W_(1/3))O_3-xPbTiO_3 CeramicsM^Jose Antonio EirasGrupo de Ceramicas Ferroeletricas, Departamento de fisica, Universidade Federal de Sao CarlosMeiras@df.ufscar.brM^Barbara M. FraygolaGrupo de Ceramicas Ferroeletricas, Departamento de fisica, Universidade Federal de Sao CarlosM^Ducinei GarciaGrupo de Ceramicas Ferroeletricas, Departamento de fisica, Universidade Federal de Sao Carlo

摘要

Electric and dielectric properties of (l-x)Pb(Fe2/3Wl/3)O_3-xPbTiO_3 solid solutions were investigated as a function of the frequency and temperature. Dielectric measurements over the temperature showed the presence three contributions, which were related to the ferro-paraelectric phase transition (around 180K.) and to conductive contributions (in the range 200K- 700 k). The FE phase transition of Pb(Fe_(2/3)W_(1/3))O_3 (PFW) is shifted to higher temperatures by PbTiO_3 (PT) additions. Conductive contributions were associated to an electronic conductivity with activation energy around 0.45 -0.55 eV.