Abstract
In this work, a series of Ta2O5-doped 0.675BiFeO3–0.3BaTiO3–0.025LaFeO3−x mol% Ta2O5 (x = 0, 0.25, 0.50, 0.75, 1.0, 1.25) multiferroic ceramics were synthesized by solid-state reaction. The effects of Ta5+ doping on their phase structure, morphology, dielectric, ferroelectric, magnetic, and magnetoelectric properties were assessed. All samples were found to crystallize in perovskite structures, and the grain size was remarkably decreased by Ta5+ doping. Ta2O5 was beneficial to the dielectric properties, with the dielectric constant rising from 829 for undoped ceramic to 1149 for x = 1.25 at 100 Hz. The remnant polarization Pr and coercive field Ec decreased as x increased, indicating the worsening of ferroelectric behavior. In comparison, the ferromagnetism was evidently enhanced with increasing content of Ta2O5, and the remanent magnetization Mr peaked at 0.035 emu/g for x = 0.75. The magnetoelectric coefficient αME reached the maximum (418.68 mV/cm·Oe) for x = 0.25 at 200 Oe and 105 Hz.
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