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- W2072236005 abstract "Thermal evolution of sol–gel derived gahnite (ZnAl2O4) with 4, 8 and 12 at.% of Zn replaced with Co was studied by thermal analysis techniques (DTA/TGA), X-ray diffraction (XRD) and UV–vis diffuse reflectance spectroscopy (DRS). Zinc–cobalt spinel powders were produced by gel heat treatment at temperatures as low as 400 °C. Crystal structure was characterized using Rietveld refinement of X-ray diffraction patterns for the samples annealed at 800 °C, simultaneously with the analysis of diffraction line broadening. It was found out that the distribution of Co2+ ions in tetrahedral and octahedral sites of zinc cobalt aluminate crystal lattice, crystallite size and lattice strain depend on Co loading. The green color of samples thermally treated at T < 800 °C has been explained as a consequence of partial oxidation of Co2+ ions at lower temperatures and accommodation of Co3+ ions in octahedral sites. Thermal treatment at higher temperatures promote gradual change of color from green to blue, characteristic for tetrahedrally coordinated Co2+ ions. The spectra evolution could be interpreted as a progressive reduction of Co3+ to Co2+ ions at higher temperatures." @default.
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- W2072236005 date "2011-02-01" @default.
- W2072236005 modified "2023-09-23" @default.
- W2072236005 title "Evolution of structural and optical properties in the course of thermal evolution of sol–gel derived cobalt-doped gahnite" @default.
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- W2072236005 doi "https://doi.org/10.1016/j.jallcom.2010.12.099" @default.
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