Mishra, Monika and Singh, Avanish Pratap and Dhawan, S. K. (2013) Expanded graphite-nanoferrite-fly ash composites for shielding of electromagnetic pollution. Journal of Alloys and Compounds, 557. pp. 244-251. ISSN 0925-8388

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Abstract

Expanded graphite (EG) was incorporated into fly ash matrix along with nanoferrite gamma-Fe2O3 particles so that the resultant conductive fly ash composite can be used for electromagnetic shielding in microwave range. Conductivity of composites lies in the range 0.34-32.86 S/cm. TEM images show that fly ash particle (0.87 mu m) is covered by sheets of EG containing the magnetic nanoparticles. Complex parameters have been calculated from experimental scattering parameters (S-11 and S-21) using theoretical calculations given in Nicholson-Ross and Weir algorithms. The microwave absorption properties of the composites have been studied in the 8.2-12.4 GHz (X-band) frequency range which shows a shielding effectiveness up-to 90 dB, which strongly depends on dielectric loss and weight fraction of fly ash and gamma-Fe2O3 in EG matrix.

Item Type:	Article
Additional Information:	copyright for this article belongs to M/s Elsevier
Subjects:	Chemistry > Physical Chemistry
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	19 Aug 2026 10:06
Last Modified:	19 Aug 2026 10:06
URI:	https://npl.csircentral.net/id/eprint/3231

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