Abstract
Single‐phase and lead‐free Bi0.85La0.15FeO3 multiferroic ceramics were prepared by a rapid liquid sintering method to study their crystal structure and multiferroic behaviors. Rietveld refinement of X‐ray diffraction data showed a pseudo‐cubic structure plus a small triclinic distortion. The absence of Fe2+ ions suggested few oxygen vacancies. Large polarizations of 20.3 μC/cm2 together with a piezoelectric d33 coefficient of ∼27.7 pC/N were achieved. This ferroelectricity originates from the stereochemical activity of the A‐site Bi3+ lone electron pair. The remnant magnetizations of 0.0744–0.227 emu/g of Bi0.85La0.15FeO3 permitted by the canting angle of canted antiferromagnetic order was released as a result of the collapse of the space‐modulated spin structure of BiFeO3. The observed dielectric anomalies proved the magnetoelectric couplings between ferroelectric order and canted antiferromagnetic order.
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