Abstract
We present the structural, dielectric, ferroelectric, magnetic and magnetoelectric studies of lead free; single phase Bi4−x Sm x Ti3−x Co x O12−δ (0 ≤ x ≤ 0.07) ceramics, synthesized using a standard solid-state reaction technique. Raman spectroscopy analysis reveals the relaxation of distortion in TiO6 octahedron. Field emission scanning electron microscopy confirmed the growth of plate-like grains. It is observed that with the substitution of Sm3+ and Co3+ ions the dielectric constant, loss tangent and ferroelectric transition temperature decreases. Electrical dc resistivity, remnant polarization and magnetization increases with increasing Sm3+ and Co3+ contents. The magnetoelectric coupling co-efficient, α = 0.65 mV cm−1 Oe−1 is realized for Bi4−x Sm x Ti3−x Co x O12−δ (x = 0.07) ceramic sample. Our results clearly demonstrate the lead free, multiferroic nature of Sm/Co-substituted Bi4Ti3O12, which may find useful application in designing cost-effective electromagnetic devices.
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Acknowledgements
We would like to acknowledge Dr. Mahavir Singh and Dr. Nagesh Thakur, Department of Physics Himachal Pradesh University, Shimla, India for magnetic, ferroelectric and dielectric measurements. Joginder Paul is thankful to the department of Higher Education Himachal Pradesh-India for providing study leave to conduct this work.
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Paul, J., Bhardwaj, S., Sharma, K.K. et al. Room-temperature multiferroic properties and magnetoelectric coupling in Bi4−x Sm x Ti3−x Co x O12−δ ceramics. J Mater Sci 49, 6056–6066 (2014). https://doi.org/10.1007/s10853-014-8328-7
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DOI: https://doi.org/10.1007/s10853-014-8328-7