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Structural and magnetic studies of Co–Ti-substituted magnetoplumbite-type (M-type) strontium ferrites by sol–gel method

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Abstract

Magnetoplumbite-type (M-type) strontium ferrites doped with varying molar ratio of cobalt and titanium (SrFe12−2x Co x Ti x O19; x = 0.2, 0.4, 0.6, 0.8 and 1.0) were prepared via sol–gel technique employing ethylene glycol as a gel precursor. The prepared samples were characterized using X-ray diffractometry (XRD), field emission scanning electron microscopy, superconducting quantum interference devices and high-resolution transmission electron microscopy (HRTEM). The XRD patterns confirmed the formation of a highly homogeneous M-type strontium ferrite at molar substitution of 0.2 in the SrFe12−2x Co x Ti x O19 system (SF02) with calculated crystallite size of 48.5 nm. Sample SF02 showed the desired magnetic properties of a reduced coercivity at 4946 (192) Oe while having enhanced remnant and saturation magnetizations of 30.33 (0.81) and 61.45 (2.14) emu/g, respectively. HRTEM imaging of SF02 showed high regularity in the stacking sequence with corresponding lattice spacings matching that commonly found in the M-type ferrite structure.

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Acknowledgments

G.B. Teh would like to thank TWAS-UNESCO Associateship Scheme 2011–2013 for the financial support and the Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) for the use of its facilities during the duration of the project. The authors would also like to acknowledge the financial support from Tunku Abdul Rahman University College, Malaysia, and MacDiarmid Institute of Advanced Materials and Nanotechnology, Victoria University of Wellington, New Zealand. The authors are also grateful to Dr. F.L. Lo for helpful discussion and providing constructive comments on the manuscript.

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Authors and Affiliations

  1. Department of Physical Science, Faculty of Applied Sciences and Computing, Tunku Abdul Rahman University College, Jalan Genting Kelang, 53300, Kuala Lumpur, Malaysia

    Geok Bee Teh

  2. Faculty of Science, University of New South Wales, Sydney, NSW, 2052, Australia

    Richard D. Tilley

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  1. Geok Bee Teh
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  2. Richard D. Tilley
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Correspondence to Geok Bee Teh.

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Teh, G.B., Tilley, R.D. Structural and magnetic studies of Co–Ti-substituted magnetoplumbite-type (M-type) strontium ferrites by sol–gel method. J Sol-Gel Sci Technol 77, 306–314 (2016). https://doi.org/10.1007/s10971-015-3855-5

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  • DOI: https://doi.org/10.1007/s10971-015-3855-5

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