Volume 17, Issue 4 ((Iranian Journal of Physics Research,fall 2017)                   IJPR 2017, 17(4): 531-540 | Back to browse issues page

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Khani O, Zargar Shoushtari M, Jazirehpour M, Farbod M. Study of hematite-iron phase transformation during iron-carbon core-shell nanoparticles synthesis and investigation of their magnetic and microwave properties. IJPR. 2017; 17 (4) :531-540
URL: http://ijpr.iut.ac.ir/article-1-1992-en.html
Shahid Chamran University of Ahvaz , omidkhani@mut-es.ac.ir
Abstract:   (4467 Views)

The structural properties and microwave absorption capability of the iron nanoparticles and iron-carbon core-shell nanoparticles have been studied, in the present paper. The investigated nanoparticles were synthesized by hydrothermal route and by reduction of hematite nanoparticles during annealing in argon-hydrogen atmosphere. Hematite-iron phase transformation during the reduction process has been studied by X-ray diffraction (XRD). XRD patterns showed that in iron nanoparticles, hematite-iron phase transformation was completed after 30 min annealing whereas about iron-carbon nanoparticles, the phase transformation completion occurred after 65 min, and before 65 min annealing, wustite (FeO) phase was still present in XRD patterns. M-H loops and relative complex permittivity (ε) and permeability (µ) of the iron nanoparticles and iron-carbon nanocapsules were investigated too. According to the ε and µ spectra in 1-18 GHz, the carbon shell can affect microwave properties of the iron nanoparticles. Carbon shell can reduce microwave permeability and permittivity of the composites containing iron nanoparticles. 

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Type of Study: Research | Subject: General

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