SYNTHESIS AND PROPERTIES OF PB(FE2 3W1/3)O-3-PBTIO3 MAGNETOELECTRIC SOLID-SOLUTIONS/

Synthesis conditions, x-ray diffraction and differential scanning calo rimetry (DSC) data, and dielectric properties of Pb(Fe2/3W1/3)O-3-PbTi O3 solid solutions are reported. The materials containing 0-20 wt % Pb TiO3 are found to have cubic structure, while those containing 30-100 wt % PbTiO3 have tetragonal structure. The Curie temperature of the te tragonal, ferroelectric phase increases with increasing PbTiO3 content . The cubic phase also exhibits anomalies in the temperature dependenc e of the dielectric constant above room temperature; these anomalies a re similar to those observed earlier for pure lead ferrite tungstate. The thermal event in DSC curves vanishes for solid solutions containin g less than 70 wt % PbTiO3. Magnetic measurements suggest the presence of a small amount of ferrite, which is not detected by XRD.