Skip to Main content Skip to Navigation
Journal articles

Influence of micro-structural features on the colour of nanocrystallised powders of hematite and visible-NIR reflectance spectra simulations

Morgane Gerardin 1, 2 Nicolas Holzschuch 1 Alain Ibanez 3 Bernard Schmitt 4 Pauline Martinetto 2
1 MAVERICK - Models and Algorithms for Visualization and Rendering
Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann, Grenoble INP - Institut polytechnique de Grenoble - Grenoble Institute of Technology
3 OPTIMA - Optique et Matériaux
NEEL - Institut Néel
Abstract : Pigments are quite complex materials whose appearance involves many optical phenomena. Here, we focused on hematite as it is a traditional pigment, whose origin of coloration has been well discussed in the literature. Pure nanocrystallised α-Fe2O3 hematite powders have been synthesised using different synthesis routes. These powders have been characterised by X-ray powder diffraction and scanning electronic microscopy. The colour of the samples has been studied by visible-NIR spectrophotometry. We obtained hematite with both various grain morphologies and noticeably different shades going from orange-red to purple. Colorimetric parameters in CIE L*a*b* colour space and diffuse reflectance spectra properties were studied against the structural parameters. For small nanocrystals, hue is increasing with the grain size until a critical diameter of about 80 nm, where the trend is reversed. Since classical scattering theories are not able to model this trend, we believe a combination of multiple physical phenomena occurring at this scale may explain it.
Complete list of metadata

https://hal.archives-ouvertes.fr/hal-03174514
Contributor : Morgane Gerardin <>
Submitted on : Friday, March 19, 2021 - 11:43:23 AM
Last modification on : Wednesday, March 24, 2021 - 10:06:24 AM

File

jaic_v26_05_final.pdf
Publisher files allowed on an open archive

Identifiers

  • HAL Id : hal-03174514, version 1

Collections

Citation

Morgane Gerardin, Nicolas Holzschuch, Alain Ibanez, Bernard Schmitt, Pauline Martinetto. Influence of micro-structural features on the colour of nanocrystallised powders of hematite and visible-NIR reflectance spectra simulations. Journal of the international colour association, International Colour Association, AIC, 2021, 26, pp.41-48. ⟨hal-03174514⟩

Share

Metrics

Record views

103

Files downloads

51