This report details correlated electrical, mechanical and magnetic behaviour in BiFeO3
ceramics doped with 10% Ln (Ln D Sm, Nd) ions on the Bi, or perovskite A, site and
synthesized by a sol–gel method. The ceramics exhibit bulk piezoelectric and ferroelectric
properties and clear ferroelectric domain patterns through piezoresponse force microscopy.
Resonant ultrasound spectroscopy, dielectric spectroscopy and magnetometry studies show
correlated magnetoelectromechanical behaviour and the existence of weak ferromagnetism for
both compositions. An anomaly with simultaneous mechanical and magnetic signatures is
discovered in both materials near room temperature, while previously reported transitions and
anomalies are found to exhibit electro- and/or magnetomechanical coupling. Magnetism is
significantly enhanced in the Sm doped sample, which is a promising multiferroic material.