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.

中文翻译：

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柠檬酸前驱体热解制备的钴取代 MgMoO4 陶瓷的结构、形态和光学性能

镁钴钼酸盐复合材料（Mg1-xCoxMoO4：x = 0, 0.3, 0.4, 0.6, 0.8 和 1）在低温下通过简便的溶胶-凝胶合成成功合成，并通过热重和差热分析（​​TG-DTA）表征)、X 射线衍射 (XRD)、傅里叶变换红外光谱 (FTIR)、拉曼光谱、扫描电子显微镜 (SEM)、紫外-可见光谱和使用 CIE L*a*b* 颜色系统的比色测量。在吸附/解吸等温线中使用Brunauer-Emmett-Teller分析计算比表面积。对 Mg1-xCoxMoO4 (0 ≤ x ≤ 1) 未研磨研磨固溶体的 X 射线衍射图的检查显示了与单斜晶系 β-MgMoO4 相关的单一连续系统。Mg1-xCoxMoO4 颜料的吸收光谱证实了钴在 β-MgMoO4 基质中的插入。CIE-L*a*b* 颜色坐标表明在 x = 0.6 时获得了强烈的紫色。