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Thermophysical and Microwave Shielding Properties of La0.5Sr0.5CoO3−δ and its Composite with Epoxy

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Abstract

The microwave shielding properties of the perovskite oxide conductors, La0.5Sr0.5CoO3−δ (LSCO), were investigated. The sintered LSCO sheets were showing excellent microwave shielding properties up to 35–42 dB in the entire X and Ku bands. Towards getting a light-weight and easily processable structure, an attempt was made to composite LSCO with the easily mouldable polymer, epoxy. The thermal, dielectric and electromagnetic wave shielding properties of the composites were studied. The mechanical strength, thermal expansivity and thermal conductivity of the composites were progressively improved with LSCO addition. An improvement in the shielding effectiveness was observed with filler addition and attained a value of 10 dB in the range of 8.2–10 GHz for a maximum loaded LSCO–epoxy composite and the value spans from 3 dB to 9 dB in the Ku band region. The improvement in the shielding effectiveness with filler addition was supplemented by the gradual improvement in the dielectric permittivity, dielectric loss and AC conductivity.

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Acknowledgements

One of the authors, K. S. Dijith, is thankful to the University Grants Commission, New Delhi for the financial support. The author, K. P. Surendran, would like to acknowledge the Indo-Portuguese bilateral project (INT/Portugal/P-09/2013). The authors are also thankful to M. R. Chandran and P. Prabhakar Rao for extending XRD and SEM facilities and S. Ananthakumar for mechanical property measurements.

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Authors and Affiliations

  1. Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum, Kerala, India

    Kesavapillai Sreedeviamma Dijith, Saju Pillai & Kuzhichalil Peethambharan Surendran

  2. Academy of Scientific and Innovative Research (AcSIR), New Delhi, India

    Kesavapillai Sreedeviamma Dijith, Saju Pillai & Kuzhichalil Peethambharan Surendran

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  1. Kesavapillai Sreedeviamma Dijith
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  2. Saju Pillai
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  3. Kuzhichalil Peethambharan Surendran
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Correspondence to Kuzhichalil Peethambharan Surendran.

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Dijith, K.S., Pillai, S. & Surendran, K.P. Thermophysical and Microwave Shielding Properties of La0.5Sr0.5CoO3−δ and its Composite with Epoxy. J. Electron. Mater. 46, 5158–5167 (2017). https://doi.org/10.1007/s11664-017-5520-y

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  • DOI: https://doi.org/10.1007/s11664-017-5520-y

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