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The infrared dielectric properties of maghemite, γ-Fe2O3, from reflectance measurement on pressed powders

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Abstract

The infrared complex permittivity functions of three varieties of maghemite, γ-Fe2O3, having different degrees of vacancy ordering, have been determined from their IR reflectance spectra, measured at near to normal incidence on pressed powder pellets. The optical constants therefrom obtained have been verified by using them in the simulation of the corresponding absorption spectra for KBr-diluted pellets, and these are in excellent agreement with the experimental spectra. All calculations are based on a procedure for the estimation of the effective dielectric function of a mixture, which incorporates percolation features, recently developed by the authors.

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Authors and Affiliations

  1. Instituto de Ciencia de Materiales, Consejo Superior de Investigaciones Científicas, Calle Serrano, 115 duplicado, 28006, E-Madrid, Spain

    Carlos Pecharromán, T. González-Carreño & Juan E. Iglesias

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  1. Carlos Pecharromán
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  2. T. González-Carreño
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  3. Juan E. Iglesias
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Pecharromán, C., González-Carreño, T. & Iglesias, J.E. The infrared dielectric properties of maghemite, γ-Fe2O3, from reflectance measurement on pressed powders. Phys Chem Minerals 22, 21–29 (1995). https://doi.org/10.1007/BF00202677

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  • DOI: https://doi.org/10.1007/BF00202677

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