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Issue 41, 2018
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Correlation between the magnetic-microstructure and microwave mitigation ability of MxCo(1−x)Fe2O4 based ferrite–carbon black/PVA composites

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Abstract

A study of controlling the microwave mitigation properties of ferrite–carbon black/PVA composites by tuning the magnetic microstructure and spin arrangement of the ferrite particles is presented. MxCo(1−x)Fe2O4 (M: Ni2+, Mn2+ & Zn2+) nano-ferrites (NFs) were synthesized by a solvothermal method and these NFs were used to fabricate NF–CB hybrids and flexible NF–CB/PVA composite films. The magnetic force microscopy studies of the NFs reveal a unique single axis oriented domain structure for Zn-NFs and multi-domain magnetic microstructures for Mn-NFs and Ni-NFs. Mössbauer analysis of the NFs reveals highly distorted co-ordination of Fe3+ cations in Zn-NFs, whereas sub-lattice spins are canted in Mn-NFs and Ni-NFs. Despite the distorted magnetic lattice and broken coordination, the largest microwave shielding effectiveness (SE) of 32 dB is observed, over a bandwidth of 8 to 18 GHz, for Zn-NF–CB/PVA with a major contribution from absorption (SEA ∼ 25 dB). The dielectric properties and Cole–Cole plots indicate enhanced interfacial polarization in Zn-NF–CB/PVA, which is attributed to the motion of polarons across multiple heterogeneous interfaces. These polarons are thought to be generated by distorted co-ordination of Fe3+, and d–d electron transition between Co2+ [leftrightharpoons] Fe3+ cations at the B-site of Zn-NF. Distorted co-ordination of Fe3+ in Zn-NF along with unique single axis oriented magnetic domains play a crucial role in magnetic losses, as μ′′ is almost double in Zn-NF based composites as compared to other composites. Due to their excellent and tunable microwave absorption properties, NF–CB/PVA composites could be employed for next generation stealth applications.

Graphical abstract: Correlation between the magnetic-microstructure and microwave mitigation ability of MxCo(1−x)Fe2O4 based ferrite–carbon black/PVA composites

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Publication details

The article was received on 16 Aug 2018, accepted on 01 Oct 2018 and first published on 02 Oct 2018


Article type: Paper
DOI: 10.1039/C8CP05235B
Citation: Phys. Chem. Chem. Phys., 2018,20, 26431-26442

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    Correlation between the magnetic-microstructure and microwave mitigation ability of MxCo(1−x)Fe2O4 based ferrite–carbon black/PVA composites

    G. Datt, C. Kotabage, S. Datar and A. C. Abhyankar, Phys. Chem. Chem. Phys., 2018, 20, 26431
    DOI: 10.1039/C8CP05235B

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