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TitleInfrared anisotropy averaging in polycrystalline samples and resonant scattering: the example of YMnO3
Author(s)Vieira, J. G.
Ribeiro, J. L.
Santo, O.
Tavares, P. B.
KeywordsModelling of infrared spectra
Optical constants
Polycrystalline materials
Light scattering
Issue dateMar-2012
PublisherIOP Publishing
JournalJournal of Optics a : Pure An Applied Optics
Abstract(s)The reflectance of ceramic YMnO3 formed by randomly oriented large crystallites (average size about 10 m) was measured at near normal incidence in the spectral range 100–1200 cm􀀀1. A calibration method was used in order to compensate for the effect of diffuse reflection on the surface of the sample. The spectrum was modelled by averaging the single-crystal reflectivity over all possible crystalline orientations. This anisotropy averaging method was found to adequately describe most of the spectrum, but failed in the regions where one of the principal refractive index became smaller than unity. We argue that these discrepancies are due to enhanced resonant scattering, and discuss the effect with the help of a simplified model of independent spheres based on the Mie theory of light scattering.
AccessRestricted access (UMinho)
Appears in Collections:CDF - FCD - Artigos/Papers (with refereeing)

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