Optical and Magnetical Properties of FeCr2O4 Nanopigments with Spinel Type Structure

et al. 2022

Solution combustion synthesis of iron chromite was reported using iron(III) nitrate nonahydrate and chromium(III) nitrate nonahydrate as starting materials, as well as glycine, urea, citric acid, and ethylene glycol as fuels. The influence of fuel type on the structure, molecular, microstructure as well as chromatic properties of samples was investigated. The X‐ray diffraction (XRD) patterns showed that unlike themodynamical prediction, glycine fuel led to strongest combustion and consequent highest XRD peak intensities and lower lattice parameters. Moreover, the change of fuel type and mixing of fuels affected XRD data. Fourier transform infrared analysis showed that the band position of Cr–O and Fe–O bonds were shifted to higher frequencies by using of fuels with weaker combustion reactions. In addition, scanning electron micrographs showed that different morphologies of FeCr2O4 particles were obtained depending on the fuel type and ratios. Energy‐dispersive X‐ray spectroscopy analysis of the samples showed that oxygen concentration of samples was less than that of stoichiometric ratio of FeCr2O4 due to local reducing atmosphere. Furthermore, chromatic properties of the powders showed that the pigment synthesized with glycine fuel has a better and lighter grayish brown color than the other ones and can be used as a suitable industrial candidate to create a brown color in the ceramic glaze.

Section: Introductionmentioning

confidence: 99%

Solution combustion synthesis of FeCr ₂ O ₄ powders for pigment applications: Effect of fuel type

et al. 2022

“…1 The iron chromite mineral is used for the production of metallic chromium and also as pigment for the decoration of ceramic wares, since the Bronze Age. 3,4 Synthetic chromite materials have been studied in many researches due to vast interesting physical and mechanical properties. Nowadays, they are applied in different advanced ceramic materials, including spectrally selective absorber coatings, 5 photocatalyst, 6,7 catalysts for photoelectrochemical H 2 -generation, and water-gas shift reaction (CO + H 2 O → CO 2 + H 2 ), 8 transparent from Vis to IR region, 9,10 ferromagnetic materials, [11][12][13] luminescent application.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, they are applied in different advanced ceramic materials, including spectrally selective absorber coatings, 5 photocatalyst, 6,7 catalysts for photoelectrochemical H 2 -generation, and water-gas shift reaction (CO + H 2 O → CO 2 + H 2 ), 8 transparent from Vis to IR region, 9,10 ferromagnetic materials, [11][12][13] luminescent application. 14 For the production of spinel materials, chemical methods are more attractive than that of traditional method (solid-state reaction), 4 because of reaction at a lower temperature, lower manufacturing costs, reducing fuel consumption, less wear on equipment. 3 Several methods are presented for the synthesis of chromite powders such as single crystal growth via flux-growth method, 15 electroplating of wastewater treatment, 16 coprecipitation, 17,18 sol-gel, 19,20 hydrothermal, 21,22 and solution combustion method.…”

Section: Introductionmentioning

confidence: 99%

Solution combustion synthesis of FeCr₂O₄:Zn,Al pigment powders

et al. 2023

FeCr 2 O 4 :Zn,Al pigment powders were prepared via a solution combustion synthesis method. Effects of Zn and Al dopants and less/extra Fe content on the structure, molecular bonds, and optical properties of powders were studied.Results showed that addition of dopants as well as extra/less content of Fe led to weaker combustion and consequently lower X-ray diffraction peak intensities, lattice parameters, and differential thermal analysis peak intensities. Moreover, Fourier transform infrared analysis illustrated that the band position of Cr-O and Fe-O bonds were shifted to higher frequencies with moving away from stoichiometry. In addition, scanning electron micrographs showed that in all samples, porous spongy microstructures were formed with highly flake-like agglomerated particles. Furthermore, there was a significant difference between the powder samples and the tiles colored with in glaze powders due to the partial dissolution of pigments in contact with the molten glaze of tiles. In comparison to the tile colored with the stoichiometric FeCr 2 O 4 pigments without dopants, the color difference (ΔE) in the tiles colored by the iron chromite pigments doped with Zn and Al dopants and less/extra Fe content reached the high values as large as ΔE = 36.19. The solar reflectance values (R s ) in near-infrared region were above 50% in all samples. Near 80% R s in the tile colored by the iron chromite pigment doped with 3 mol% Zn and the yellowish brown appearance (L* = 43.44, a* = 6.77, b* = 18.38, c* = 19.59, h = 69.79) showed that the sample was a good candidate for cool building materials such as roof tiles.

“…As the crystal field stabilization energy of Cr 3+ is more than that of Fe, the Cr ions prefer to occupy the octahedral sites 1 . FeCr 2 O 4 can be employed in various conventional and advanced fields, such as pigments, 2,3 ferromagnetic materials, 4 and photocatalysts 5 . Several methods, including solid‐state reactions 2,3 and wet chemical methods, 6–9 have been reported for the synthesis of spinel structure powders.…”

Section: Introductionmentioning

confidence: 99%

“…FeCr 2 O 4 can be employed in various conventional and advanced fields, such as pigments, 2,3 ferromagnetic materials, 4 and photocatalysts 5 . Several methods, including solid‐state reactions 2,3 and wet chemical methods, 6–9 have been reported for the synthesis of spinel structure powders. Some mineralogists investigated the oxidation of iron chromite in the mantle 10 and single crystal forms 11,12 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of (Fe,Cr)₂O₃ solid solution pigment powders for ink application

2022

Iron chromite pigment was synthesized via solution combustion using iron(III) nitrate nonahydrate and chromium(III) nitrate nonahydrate as starting materials, and glycine, urea, citric acid, and ethylene glycol as fuels. The effect of postheating temperature on the structure, microstructure, and chromatic properties of the synthesized powders was also studied. X‐ray diffraction patterns showed that the as‐synthesized powders were amorphous to crystalline FeCr2O4 phases, depending on fuel type. Moreover, regardless of the fuel type, postheating led to the d‐space shift and oxidation and formation of (Fe,Cr)2O3 solid solution. Phase transformation of FeCr2O4 to (Fe,Cr)2O3 solid solution was observed at 500/750°C depending on the dominant phase present in the as‐synthesized particles. Fourier transform infrared analysis illustrated a shift in the band position of octahedral M–O and tetrahedral M–O bonds due to the movement of Fe cations and the lattice shrinkage by increasing the postheating temperature. Moreover, scanning electron micrographs showed that Fe0.7Cr1.3O3 semispherical fine particles consisted mainly of porous and spongy FeCr2O4 particles due to the oxidation and phase transformation during postheating. According to chromatic measurements, the ink prepared by using the powders synthesized in the presence of glycine and post‐heated at 500°C showed reddish‐brown color which could be considered a promising candidate for tile decoration application. Furthermore, rheology studies revealed that the prepared ink showed non‐Newtonian shear thinning behavior.