Negi, N. S. and Kumar, Rakesh and Sharma, Hakikat and Shah, J. and Kotnala, R. K. (2018) Structural, multiferroic, dielectric and magnetoelectric properties of (1-x) Ba0.85Ca0.15Ti0.90Zr0.10O3-(x)CoFe2O4 lead-free composites. Journal of Magnetism and Magnetic Materials, 456. pp. 292-299. ISSN 0304-8853

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High performance lead-free multiferroic composites with strong magnetoelectric coupling effect are desired to replace lead-based ceramics in multifunctional device applications due to increasing environmental issues. We report crystal structure, ferroelectric, magnetic, dielectric and magnetoelectric properties of (1-x)Ba0.85Ca0.15Ti0.90Zr0.10O3-(x)CoFe2O4 (BCTZ-CFO) lead-free composites with x = 0.1, 0.3, 0.5, 0.7 and 0.9 synthesized by chemical solution method. BCTZ power was synthesized by sol-gel method while CFO was prepared by metallo-organic decomposition (MOD) method. The XRD results confirm successful formation of the BCTZ-CFO composites without presence of any impurity phase. At room temperature, the BCTZ-CFO composites show multiferroic behavior characterized by ferroelectric and ferromagnetic hysteresis curves. The composite having 10 wt% of CFO exhibited maximum polarization, remnant polarization and coercive field of P-s similar to 5.1 mu C/cm(2), P-r similar to 1.4 mu C/cm(2) and E-c similar to 11.6 kV/cm respectively. The BCTZ-CFO composite with 90 wt% of CFO incorporation exhibits improved ferromagnetic properties with M-s similar to 32 emu/g, M-r similar to 11.7 emu/g and H-c similar to 504 Oe. Mossbauer spectra analysis show two sets of six-line hyperfine patterns for BCTZ-CFO composites, indicating the presence of Fe3+ ions in both A and B sites. Increasing BCTZ content was found to decrease the hyperfine field strength at both sites and is consistent with the decreasing magnetic moment observed for the samples. The maximum dielectric constant value epsilon' similar to 678 is obtained at 1 MHz for composite with 10 wt% of CFO phase. The results indicate that the BCTZ-CFO composites are potential lead-free room temperature multiferroic systems.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Elsevier.
Subjects: Materials Science
Applied Physics/Condensed Matter
Depositing User: Users 27 not found.
Date Deposited: 20 Dec 2019 06:54
Last Modified: 20 Dec 2019 06:54

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