Abstract
Single-phase multiferroic Ba4Nd2Fe2Nb8O30 ceramics with the tetragonal tungsten bronze structure were synthesized. The dielectric, ferroelectric, and magnetic properties were systematically studied at room temperature, and the room-temperature multiferroic features were certified by the polarization–electric field hysteresis loops and magnetization-field curves in Ba4Nd2Fe2Nb8O30 ceramics. Interestingly, it was found that the ferroelectric polarization was enhanced by treating samples in non-oxidizing atmospheres, and the highest remnant polarization of 0.94 μC/cm2 can be found in the N2-annealed samples. The refined neutron powder diffraction results showed that the modified ferroelectricity was originated from the displacement of Fe3+/Nb5+ cations at B-sites rather than the oxygen vacancies. These results indicate that the heat treatment in controlled atmosphere is effective means to improve ferroelectricity in tetragonal tungsten bronze structure ceramics.
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Funding
This work was financially supported by the National Key R&D Program of China (No. 2018YFC0114902), the National Natural Science Foundation of China (No. 51572237, 51802280, 51772266), Natural Science Foundation of Zhejiang Province (No. LZ17E020003), the 111 Project (No. B16042), and the Fundamental Research Funds for the Central Universities (No. 2017XZZX001-04, 2017QNA4011).
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by CL, JSH, YHH, XM, MSF, JL, XQL, and YJW. The first draft of the manuscript was written by CL and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Li, C., Hong, J.S., Huang, Y.H. et al. Modified ferroelectricity in multiferroic Ba4Nd2Fe2Nb8O30 ceramics via atmosphere treatment. J Mater Sci: Mater Electron 33, 16414–16424 (2022). https://doi.org/10.1007/s10854-022-08535-9
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DOI: https://doi.org/10.1007/s10854-022-08535-9