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The infrared dielectric properties of η–Al2O3

Published online by Cambridge University Press:  31 January 2011

Carlos Pecharromán ,
T. González-Carreño  and
Juan E. Iglesias
Carlos Pecharromán
Affiliation:
Instituto de Ciencia de Materiales, Consejo Superior de Investigaciones Científicas, Calle Serrano, 115 duplicado, Madrid 28006, Spain
T. González-Carreño
Affiliation:
Instituto de Ciencia de Materiales, Consejo Superior de Investigaciones Científicas, Calle Serrano, 115 duplicado, Madrid 28006, Spain
Juan E. Iglesias*
Affiliation:
Instituto de Ciencia de Materiales, Consejo Superior de Investigaciones Científicas, Calle Serrano, 115 duplicado, Madrid 28006, Spain
*
a) Author to whom all correspondence should be addressed.
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Abstract

The infrared complex permittivity function of pseudo-cubic, disordered, spinel-type variety of alumina, η–Al2O3, obtained by spray pyrolysis, has been determined from its IR reflectance spectra, measured at near to normal incidence on pressed powder pellets. The optical constants obtained therefrom have been verified by using them in the simulation of the corresponding absorption spectra for KBr-diluted pellets of this material, 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 incorporating percolation features, which has been recently developed by the authors.

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Articles
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Journal of Materials Research , Volume 11 , Issue 1 , January 1996 , pp. 127 - 133
Copyright
Copyright © Materials Research Society 1996

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