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Correlation between micro-structural features and color of nanocrystallized powders of hematite

Morgane Gerardin 1, 2 Nicolas Holzschuch 2 Alain Ibanez 3 Bernard Schmitt 4 Pauline Martinetto 1
2 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 nanocrystallized $\alpha-Fe_2O_3$ hematite powders have been synthesized using different synthesis routes. These powders have been characterized by X-Feray powder diffraction and scanning electronic microscopy. The color of the samples has been studied by visible-FeNIR spectrophotometry. We obtained hematite with both various grain morphologies and noticeably different shades going from orange-Fe red to purple. Colorimetric parameters in CIE L*a*b* color 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. We believe a combination of multiple physical phenomena occurring at this scale may explain this trend.
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Submitted on : Thursday, October 22, 2020 - 3:26:39 PM
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Morgane Gerardin, Nicolas Holzschuch, Alain Ibanez, Bernard Schmitt, Pauline Martinetto. Correlation between micro-structural features and color of nanocrystallized powders of hematite. AIC 2020 - Association Internationale de la Couleur / Couleur Naturelles - Couleurs Numériques, Nov 2020, Avignon, France. pp.1-7. ⟨hal-02975266⟩



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