Abstract Nanocrystals of zinc-cobalt molybdate (Zn1-xCoxMoO4) were prepared by the glycine-nitrate process (GNP) route with a glycine/nitrate ratio of 2:3 and compared to the solid state synthesis. The obtained powders were characterized by thermal analysis (TGA-TDA), X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. The morphology was examined by scanning electron microscopy (SEM) and Brunauer–Emmett–Teller (BET). The particle size was determined by transmission electron microscopies (TEM). UV–Visible spectroscopy and CIE L*a*b* colorimetric parameters have been used for the colour characterisation and measurement. The compounds obtained present two single-phased domains regardless of the synthesis method. The first domain of blue colour corresponding to a level of cobalt x such as: 0 = x ≤ 0.3, isostructural with α-ZnMoO4 of triclinic symmetry and the second domain of green colour, for cobalt x levels such as: 0.45 = x ≤ 1 isostructural with α-CoMoO4 of monoclinic structure. The Zn0.7Co0.3MoO4 powders obtained at 700 °C by GNP route and synthesized in acidic environment were formed of particles of quasi-spherical morphology, with average size of crystallites estimated between 80 - 140 nm.

中文翻译：

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钼酸盐 Zn1-xCoxMoO4 (0 ≤ x ≤ 1) 的合成，通过甘氨酸 - 硝酸盐工艺 (GNP) 开发的前体的分解及其表征

摘要 通过甘氨酸-硝酸盐工艺 (GNP) 路线以 2:3 的甘氨酸/硝酸盐比制备钼酸锌钴 (Zn1-xCoxMoO4) 纳米晶体，并与固态合成进行比较。通过热分析(TGA-TDA)、X射线粉末衍射(XRD)、傅里叶变换红外光谱(FTIR)和拉曼光谱对所得粉末进行表征。通过扫描电子显微镜（SEM）和Brunauer-Emmett-Teller（BET）检查形态。粒度通过透射电子显微镜(TEM)确定。紫外-可见光谱和 CIE L*a*b* 比色参数已用于颜色表征和测量。无论合成方法如何，所获得的化合物都存在两个单相域。蓝色的第一个域对应于钴的水平 x 如：0 = x ≤ 0.3，具有三斜对称的α-ZnMoO4 和绿色的第二域的同构结构，对于钴x 水平，例如： 0.45 = x ≤ 1 与单斜结构的α-CoMoO4 同构。通过 GNP 途径在 700°C 下获得并在酸性环境中合成的 Zn0.7Co0.3MoO4 粉末由准球形形态的颗粒形成, 晶粒的平均尺寸估计在 80 - 140 nm 之间。