Influence of Sn{sup 4+} and Sn{sup 4+}/Mg{sup 2+} doping on structural features and visible absorption properties of {alpha}-Fe{sub 2}O{sub 3} hematite

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.04.043· OSTI ID:21432475

Gaudon, M ^[1]; Pailhe, N; Majimel, J; Wattiaux, A; Abel, J; Demourgues, A ^[1]

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1. Institut de Chimie de la Matiere Condensee de Bordeaux, UPR 9048 CNRS - Universite de Bordeaux 1, 87 Avenue du Docteur Schweitzer, 33608 PESSAC Cedex (France)

Pure, Sn-doped and Mg/Sn co-doped {alpha}-Fe{sub 2}O{sub 3} hematite samples were synthesized by precipitation process. Fe{sub 2}O{sub 3} is the most popular red mineral pigment which is used largely in traditional ceramics, tar and concrete. The compounds were characterized by powder X-ray diffraction (XRD), scanning transmission electronic microscopy (energy dispersive X-ray cartography), Moessbauer spectroscopy, magnetic investigations versus temperature and visible-NIR spectroscopy. Both {sup 57}Fe and {sup 119}Sn Moessbauer analyses combined with rietveld XRD refinements are the ideal techniques to characterize tin-iron oxides. Hence, thanks to these techniques it was shown how the synthesis temperature influences directly the grain size and the dopants concentration limit which can be incorporated into the host hematite matrix. The stabilization of these tetravalent and divalent dopants into the hematite framework leads to reduce the crystal growth and to limit the (AF) ordering due to the formation of cationic vacancies. The study of the Morin magnetic transition emphasizes this demonstration. In a second part, the influence of the dopants incorporation on the material color was investigated in order to show which key parameters allow improving the red color saturation of iron oxides. In order to improve the red color of the hematites, it was shown that the introduction of cationic vacancies-limiting the octahedral distortion thanks to the interruption of the dissymmetric metal-metal orbital coupling-is the key point. Vacancies are created by Sn{sup 4+}, doping for an increase of the introduced Sn{sup 4+} concentration; it acts to the detriment of the color saturation. - Graphical Abstract: Sn-doped or Sn/Mg-doped Fe{sub 2}O{sub 3} hematites, were analyzed by X-ray diffraction refinement, Moessbauer spectroscopy, magnetic characterization and TEM investigations. Their color is correlated to the doping ions concentration.

• OSTI ID: 21432475
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 9; Other Information: DOI: 10.1016/j.jssc.2010.04.043; PII: S0022-4596(10)00240-9; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
CONCRETES
CRYSTAL GROWTH
DOPED MATERIALS
GRAIN SIZE
HEMATITE
INFRARED SPECTRA
IRON OXIDES
MAGNESIUM IONS
MOESSBAUER EFFECT
MORIN
NEAR INFRARED RADIATION
PIGMENTS
SYNTHESIS
TIN
TIN IONS
TRANSMISSION ELECTRON MICROSCOPY
VACANCIES
X-RAY DIFFRACTION
AROMATICS
BUILDING MATERIALS
CHALCOGENIDES
CHARGED PARTICLES
COHERENT SCATTERING
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIFFRACTION
DYES
ELECTROMAGNETIC RADIATION
ELECTRON MICROSCOPY
ELEMENTS
FLAVONES
FLAVONOIDS
HYDROXY COMPOUNDS
INFRARED RADIATION
IONS
IRON COMPOUNDS
IRON ORES
MATERIALS
METALS
MICROSCOPY
MICROSTRUCTURE
MINERALS
ORES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHENOLS
POINT DEFECTS
POLYPHENOLS
RADIATIONS
REAGENTS
SCATTERING
SIZE
SPECTRA
TRANSITION ELEMENT COMPOUNDS