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Effect of Excess Lead Oxide and Thermal Treatment on Dielectric and Magnetic Properties of Pb(Fe2/3W1/3)O3

Lead iron tungstate ceramics were synthesized by the columbite method. Two compositions were prepared, one with the stoichiometric ratio and the second one with an additional 2 wt% PbO. To investigate the influence of the synthesis conditions on the physical properties, the compositions were calcined and sintered at different temperatures. Due to the excess PbO, the apparent dielectric permittivity and conductivity decreased. Higher calcination and sintering temperatures led to higher dielectric permittivity as well as higher conductivity values. For all samples, weak ferromagnetism was observed caused by local disorder on the B-site sublattice.