Multiferroic Properties of Single-Phase Bi0.85La0.15FeO3 Lead-Free Ceramics |
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| Authors: | G L Yuan K Z Baba-Kishi J -M Liu Siu Wing Or Y P Wang Z G Liu |
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| Affiliation: | Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China |
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| 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 d 33 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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