Ferroelectric And Magnetic Phase Transitions In Multiferroic Pbfe0.5ta0.5o3-Pbtio3 Solid Solutions

Dielectric, X-ray, piezoelectric and Mossbauer studies of highly-resistive Li-doped (1-x)PbFe0.5Ta0.5O3-(x)PbTiO3 ceramics from the 0< x <0.3 range fabricated by solid state synthesis and usual sintering have been carried out. Addition of PbTiO3 to PbFe0.5Ta0.5O3 increases the temperature T-m of the permittivity maximum, decreases the diffusion of this maximum and lowers the Neel temperature T-N. However above a certain compositional threshold fast lowering of T-N stops and a new magnetic state with comparatively high (similar to 50 K) transition temperature becomes stable in a rather wide compositional range.