Journal ArticleDOI
On the Study of Surface Fluorinated α -Fe₂O₃ for Microwave Absorption
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TLDR
The MW absorption characteristics of fluorinated surface fluorinated Fe are found to be superior to pristine and a potential candidate as radar absorbing material (RAM) for the first time.Abstract:
This article involves microwave (MW) absorption characteristic investigation of surface fluorinated iron oxide, synthesized via the hydrothermal method and compared with pristine $\alpha $ -Fe2O3. The MW absorption characteristics are studied by measuring real and imaginary parts of both permittivity ( $\varepsilon$ ) and permeability ( $\mu $ ) for pristine $\alpha $ -Fe2O3 and surface fluorinated Fe2O3 in the frequency range of 5.85–18 GHz. The imaginary part of permeability ( $ {\mu }_{\mathrm {r}}^{''}$ ) and the magnetic loss tangent value ( ${\tan} {\delta }_{ {\mu }}$ ) of surface fluorinated Fe2O3 are found to be superior to pristine $\alpha $ -Fe2O3. The maximum reflection loss (RL) in surface fluorinated Fe2O3 is observed at different frequencies as a function of sample’s thickness, for example, RLs −18 dB at 7.5 GHz ( $t = 3.5$ mm) and −12 dB at 9 GHz ( $t = 3$ mm), respectively. These characteristics make this material a potential candidate as radar absorbing material (RAM) both in $C$ -band and $X$ -band. For the first time, the MW absorption characteristics of fluorinated $\alpha $ -Fe2O3 have been demonstrated, which are the novel study in itself.read more
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Journal ArticleDOI
Analysis of XPS spectra of Fe2+ and Fe3+ ions in oxide materials
Toru Yamashita,Peter C. Hayes +1 more
TL;DR: In this paper, the peak positions and peak shape parameters of Fe 3p for Fe2+ and Fe3+ were derived from the XPS spectra of the standard samples of 2FeO·SiO2 and Fe2O3, respectively.
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Raman microspectroscopy of some iron oxides and oxyhydroxides
TL;DR: In this paper, the laser power dependence of the spectra of oxides and oxyhydroxides was investigated by using Raman microscopy, and it was shown that increasing laser power causes the characteristic bands of hematite to show up in the spectrum of most of the compounds studied.
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Measurement of the Intrinsic Properties of Materials by Time-Domain Techniques
A. M. Nicolson,G. F. Ross +1 more
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Solar Water Splitting: Progress Using Hematite (α‐Fe2O3) Photoelectrodes
TL;DR: The latest efforts using advanced characterization techniques, particularly electrochemical impedance spectroscopy, are presented to define the obstacles that remain to be surmounted in order to fully exploit the potential of hematite for solar energy conversion.
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Automatic measurement of complex dielectric constant and permeability at microwave frequencies
TL;DR: In this article, a system is employed that automatically measures the complex reflection and transmission coefficients that result when a sample of material is inserted in waveguide or a TEM transmission line.