Phase evolution and enhanced piezoelectric, multiferroic, and magnetoelectric properties in Cr-Mn co-doped BiFeO3-BaTiO3 system

Cr-Mn co-doped (1 - y)BiFe1 - xCrxO3-yBaTi(1 - x)Mn(x)O(3) (0 <= x <= 0.1, 0.15 <= y <= 0.3) (BFC-BTM) ceramics were fabricated by a sol-gel method. X-ray diffraction and Raman scattering experiments show a Cr-Mn co-doping-induced gradual structural transformation from the rhombohedral to pseudo-cubic phase, near which the morphotropic phase boundaries (MPB) are established. Detailed ferroelectric (FE) and dielectric analyses show a composition x-induced FE to relaxor FE and finally to dipole glass (DG) phase transitions. The structure-physical property phase diagram is obtained for the Cr-Mn co-doped BFC-BTM system. Improved piezoelectric and magnetoelectric properties are revealed in the samples near the MPB. All these results suggest that Cr-Mn substitution in BiFeO(3-)based systems is effective for obtaining room-temperature multiferroics near MPB with enhanced magnetoelectric effects.

Automated summary

By co-doping with Cr-Mn, BFC-BTM ceramics achieve a gradual structural transformation from rhombohedral to pseudo-cubic phase, establishing morphotropic phase boundaries. Improved piezoelectric and magnetoelectric properties are observed in samples near the MPB.