Abstract
(1 − x)BiFeO3–(x)CaTiO3 [(1 − x)BFO–(x)CTO, (x = 0, 0.1, 0.2 and 0.3)] composites were synthesized using sol–gel chemical method. Rietveld refinement was performed on X-ray diffraction data of all the samples reflect rhombohedral structure for x = 0, 0.1, 0.2 and the mixture of rhombohedral and orthorhombic structure for x = 0.3. The Field Emission Scanning Electron Microscope (FESEM) investigation confirms the microstructure consists of randomly oriented, homogenous, and non-uniform grains. The dielectric permittivity (ε) and tangent loss (tan δ) decreases with increasing frequency and show dielectric anomalies (as a hump) at different temperatures for different compositions. The incorporation of CTO decreases three order of leakage current (up to x = 0.2) and significantly improve the magnetization and magneto-dielectric coupling. The frequency-dependent ac conductivity obeys Jonscher’s power law with large ac conductivity dispersion for higher frequencies with increasing CTO concentration. The variations of ac conductivity with the inverse of temperature obey the Arrhenius equation and show negative temperature coefficient of resistance (NTCR) behaviour. The ferromagnetic (FM) properties in BFO–CTO increases significantly with the increase of CTO concentration. The coercive field increases with increasing CTO concentration suggesting a competition between the antiferromagnetic and ferromagnetic ordering. The BFO–CTO samples exhibit large positive and negative magneto-dielectric coupling effect at room temperature.
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Acknowledgements
We wish to thank DST, Government of India, New Delhi for financial support to the Centre of Materials Sciences under FIST Programme. B Khan thankfully acknowledges the University Grant Commission (UGC) of India for providing UGC research fellowship. The author Manoj K Singh is grateful to UGC India for financial support under the major research project (Grant No. 39-869/2010).
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Khan, B., Kumar, A., Yadav, P. et al. Structural, dielectric, magnetic and magneto-dielectric properties of (1 − x)BiFeO3–(x)CaTiO3 composites. J Mater Sci: Mater Electron 32, 18012–18027 (2021). https://doi.org/10.1007/s10854-021-06344-0
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DOI: https://doi.org/10.1007/s10854-021-06344-0