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Structural, morphological and optical properties of cobalt-substituted MgMoO4 ceramics prepared by pyrolysis of citric acid precursors

Abstract : Magnesium-cobalt molybdate composites (Mg1–xCoxMoO4: x = 0, 0.3, 0.4, 0.6, 0.8 and 1) were successfully synthesized through a facile sol-gel synthesis at low temperature, and characterized by thermogravimetric and differential thermal analysis (TG-DTA), X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FTIR), Raman spectroscopy, scanning electron microscopy (SEM), UV-Vis spectroscopy and colorimetric measurements using the CIE L*a*b* colour system. The surface specific area was calculated using the Brunauer–Emmett–Teller analysis in the adsorption/desorption isotherm. The examination of the X-ray diffractograms of the unground milled solid solutions of Mg1–xCoxMoO4 (0 ≤ x ≤ 1) presented a single continuous system related to monoclinic β-MgMoO4. The absorbance spectra of the Mg1–xCoxMoO4 pigments confirmed the insertion of cobalt in the β- MgMoO4 matrix. The CIE-L*a*b* colour coordinates indicated that the intense purple colour was obtained for x = 0.6.
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Submitted on : Friday, October 23, 2020 - 4:32:26 PM
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Hind Lakhlifi, Youssef El Jabbar, Rachida El Ouatib, Lahcen Er-Rakho, Sophie Guillemet-Fritsch, et al.. Structural, morphological and optical properties of cobalt-substituted MgMoO4 ceramics prepared by pyrolysis of citric acid precursors. Surfaces and Interfaces, Elsevier, 2020, 21, pp.100718. ⟨10.1016/j.surfin.2020.100718⟩. ⟨hal-02976834⟩

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