On the transparency of nanostructured alumina: Rayleigh-Gans model for anisotropic spheres

A light scattering model under the Rayleigh-Gans-Debye approximation has been developed for polycristalline alumina. The model states that transmittance of dense alumina ceramics basically depends not only on the maximum grain size but also on the preferential orientation of their c-axis, or texture...

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Veröffentlicht in:	Optics express 2009-04, Vol.17 (8), p.6899-6912
Hauptverfasser:	Pecharromán, Carlos, Mata-Osoro, Gustavo, Díaz, L Antonio, Torrecillas, R, Moya, J S
Format:	Artikel
Sprache:	eng
Schlagworte:	Aluminum Oxide - chemistry Anisotropy Computer Simulation Light Models, Chemical Nanospheres - chemistry Nanospheres - ultrastructure Nanotechnology - methods Refractometry - methods Scattering, Radiation
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creator	Pecharromán, Carlos Mata-Osoro, Gustavo Díaz, L Antonio Torrecillas, R Moya, J S
description	A light scattering model under the Rayleigh-Gans-Debye approximation has been developed for polycristalline alumina. The model states that transmittance of dense alumina ceramics basically depends not only on the maximum grain size but also on the preferential orientation of their c-axis, or texture. The effect of texture in transparency has been experimentally measured on several dense alumina samples with different grain size and compared to that obtained from x-ray Rietveld refinements with a very good agreement. The Rayleigh-Gans-Debye approximation also allows to represent optical data in a very simple way (logarithm of transmittance vs. the inverse of the wavelength square). Using these variables, a straight line is obtained for the Rayleigh-Gans-Debye approximation, its slope being proportional to the maximum grain size and textural parameter. Deviation from this law implies the presence of pores or grain of extremely large size.
doi_str_mv	10.1364/oe.17.006899
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subjects	Aluminum Oxide - chemistry Anisotropy Computer Simulation Light Models, Chemical Nanospheres - chemistry Nanospheres - ultrastructure Nanotechnology - methods Refractometry - methods Scattering, Radiation
title	On the transparency of nanostructured alumina: Rayleigh-Gans model for anisotropic spheres
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