Nano-sized M_0.05Eu_0.05Ca_0.9MoO₄ (M=Li, Na, K, Rb, Cs) ceramics have been successfully synthesized by an aqueous sol–gel synthesis method using a tartaric acid as a ligand. In order to reveal the influence of the peculiarities of the nature of dopants effect into the crystallization of CaMoO₄ double oxide, the thermal analysis of the as-prepared gels was performed. In addition, infrared spectroscopy was used in order to identify the functional groups from the characteristic stretching vibrations in the M–Eu–Ca–Mo–O tartrate gel precursors. Besides, to confirm the dynamics of growing crystallites in the final ceramics and to reveal the morphological changes on the surface, the x-ray diffraction and scanning electron microscopy were applied. Finally, photoluminescence measurements were used to estimate the optical properties of europium oxide as a dopant in the samples according to the nature of alkali metal. Therefore, according to the obtained results, it was estimated that luminescence intensity of Eu³⁺ ions is mainly affected by the chemical reaction, which takes place at about 973 K of temperature. This effect was partly confirmed from the results of the thermal decomposition of M–Eu–Ca–Mo–O tartrate gel precursors with an endothermic behaviour in the DSC curve, which indicates the crystallization mechanism of the CaMoO₄ double oxide.

中文翻译：

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M 0.05 Eu 0.05 Ca 0.9 MoO 4（M = Li，Na，K，Rb，Cs）纳米微晶的水溶胶-凝胶合成，热分析研究和发光性质

纳米级M _0.05 Eu _0.05 Ca _0.9 MoO ₄（M = Li，Na，K，Rb，Cs）陶瓷已通过酒石酸为配体的水溶胶-凝胶合成方法成功合成。为了揭示CaMoO ₄结晶中掺杂性质的特殊性的影响对于双氧化物，对所制备的凝胶进行热分析。此外，使用红外光谱法从酒石酸M–Eu–Ca–Mo–O酒石酸盐凝胶前体中的特征拉伸振动中鉴定官能团。此外，为了证实最终陶瓷中生长的微晶的动力学并揭示表面上的形态变化，应用了X射线衍射和扫描电子显微镜。最后，根据碱金属的性质，使用光致发光测量来估计氧化samples作为掺杂剂的光学性质。因此，根据获得的结果，估计Eu ^3+的发光强度离子主要受化学反应的影响，该反应发生在约973 K的温度下。这种作用部分由M–Eu–Ca–Mo–O酒石酸盐凝胶前体的热分解结果证实，DSC曲线具有吸热行为，这表明CaMoO ₄双氧化物的结晶机理。