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Design of nano-sized Pr3+–Co2+-substituted M-type strontium hexaferrites for optical sensing and electromagnetic interference (EMI) shielding in Ku band

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Abstract

This research investigates the effect of Pr3+–Co2+ substitution on the structural, optical, and electromagnetic interferrence (EMI) shielding properties of M-type strontium hexagonal ferrites with chemical composition Sr1−xPrxFe12−yCoyO19 (x = 0.0, 0.2, 0.4 and y = 0.00, 0.15, 0.35). The sample was prepared by sol–gel auto-combustion technique, pre-sintered at 400 °C for 4 h and sintered at 950 °C for 5 h. XRD analysis shows that the sample exhibits pure crystalline phase with no presence of impurity such as α-Fe2O3. The presence of three prominent peaks at 434, 543, and 586 cm−1 in FTIR spectra indicates the formation of hexaferrite phase. FESEM micrographs depict nanoparticles with hexagonal plate-like structure of hexaferrites which is vital for microwaves absorption, whereas EDX spectra show the host and substituted ions. The observed band gap was found to decrease with increase in Pr3+–Co2+ concentration. The maximum EMI shielding effectiveness of 27.40 dB at 18 GHz was obtained for the sample S2 which is above the commercial level of 20 dB.

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Acknowledgements

The authors thank Sophisticated Test and Instrumentation and Centre (STIC), Cochin University of Science and Technology, Kerala, India, for UV–Vis–NIR spectrophotometer characterization.

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Authors and Affiliations

  1. Department of Physics, School of Physical Sciences and Chemical Engineering, Lovely Professional University, Phagwara, Punjab, 144411, India

    J. Mohammed, Tchouank Tekou Carol Trudel, D. Basandrai & A. K. Srivastava

  2. Department of Physics, Faculty of Science, Federal University Dutse, P.M.B. 7156, Dutse, Jigawa, Nigeria

    J. Mohammed & H. Y. Hafeez

  3. SRM Research Institute, SRM University, Kattankulathur, Chennai, 603203, India

    H. Y. Hafeez

  4. Analytic Division and Centralised Instrument Facility, CSIR-Central Salt and Marine Chemicals Research Institute, Gijubhai Badheka Marg, Bhavnagar, India

    Gopala Ram Bhadu

  5. Department of Chemistry, Guru Nanak Dev University, Amritsar, 143005, India

    Sachin Kumar Godara

  6. Department of Electronics Technology, Guru Nanak Dev University, Amritsar, 143005, India

    S. B. Narang

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Mohammed, J., Trudel, T.T.C., Hafeez, H.Y. et al. Design of nano-sized Pr3+–Co2+-substituted M-type strontium hexaferrites for optical sensing and electromagnetic interference (EMI) shielding in Ku band. Appl. Phys. A 125, 251 (2019). https://doi.org/10.1007/s00339-019-2545-5

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