Abstract
Multiferroic ceramics xBi0.5Na0.5TiO3-(1-x)NiFe2O4 (x = 0–1) have been prepared by a sol–gel method. Crystal structures were investigated by X-ray diffraction. The results show the samples are pure phases and increasing Bi0.5Na0.5TiO3 content induces a gradual phase transformation from spinel to perovskite structure. Scanning electron microscopy micrographs also present the size and structure of the samples. Results from energy dispersive spectrometer confirm the stoichiometry of the compound. Both of the data are proved to agree with the results of X-ray diffraction. All of the samples display the evident ferromagnetic properties at 300 K and the saturation magnetization almost linearly varies with the increasing of x. The room temperature polarization-electric field loops were examined. Compared with pure NiFe2O4, superior ferroelectric properties are obtained with increasing maximum of polarization as the content of Bi0.5Na0.5TiO3 increases. Dielectric properties were also studied. The dielectric constant is proved to increase as Bi0.5Na0.5TiO3 content increases at room temperature and the dielectric loss decreases as Bi0.5Na0.5TiO3 doped in NiFe2O4. In addition, some of samples exhibit the effect of magnetoelectric coupling.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 11174092). We would like to thank the staffs of Analysis Center of HUST for their assistance in various measurements.
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Wang, L., Zhu, C., Luo, H. et al. Studies on room temperature multiferroic properties of xBi0.5Na0.5TiO3-(1-x)NiFe2O4 ceramics. J Electroceram 35, 59–67 (2015). https://doi.org/10.1007/s10832-015-9992-y
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DOI: https://doi.org/10.1007/s10832-015-9992-y