Comparative Studies of Ferroelectric and Magnetic Phase Transitions in Pb(Fe1/2Nb1/2)O-3-PbMO3 (M-Ti, Zr) Multiferroic Solid Solutions

摘要

Some peculiar features of magnetic x,T-phase diagram of (1-x)PbFe1/2Nb1/2O3-xPbTiO(3) system at x approximate to 0.1 have been ascribed previously to the change of the lattice symmetry from rhombohedral to tetragonal or to the decrease of the lattice parameter with x. We carried out structural, dielectric, magnetization, and Mossbauer studies of (1-x)PbFe1/2Nb1/2O3-xPbZrO(3) system, where the symmetry remains rhombohedral, while the lattice parameter increases with x. However, the magnetic x,T-phase diagram of (1-x)PbFe1/2Nb1/2O3-xPbZrO(3) appeared to be very similar to that of (1-x)PbFe1/2Nb1/2O3-xPbTiO(3). Anomalies of composition dependence of magnetic phase transition temperatures at x approximate to 0.1 are supposed to be due to the percolation phase transition.