Abstract The mixed crystals of the Tutton’s salt doped with Li following the empirical formula K2LiyNixCo1-x (SO4)2.6H2O, were synthesized from the slow evaporation of the solvent at constant temperature. The presence of K, S, Ni, Co and O elements in the studied crystalline structure was confirmed by EDS spectroscopy using a scanning electron microscope and their quantification including Li was carried out with the help of ICP-OES technique. Raman spectroscopy in the range 100−3600 cm−1, confirmed the presence of tetrahedral (SO4), octahedral complexes Ni(H2O)6, Co(H2O)6, and H2O molecules in the crystal structure. Our UV–vis studies have shown that the mixed crystals have good optical transparency in the ultraviolet (200−350 nm) and infrared (750−1000 nm) region. The direct and indirect optical energy gap of the synthesized crystals were determined from the Tauc’s plot. XRD diffractograms of the sample crystals do not show any specific changes due to the presence of Li ion in the crystalline network.

中文翻译：

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K2LiyNixCo1-xSO42.6H2O (y=0.1;0.2;0.3;0.4) 晶体的生长和振动光谱

摘要 根据经验式K2LiyNixCo1-x (SO4)2.6H2O，由溶剂在恒温下缓慢蒸发合成了掺杂Li的Tutton盐的混晶。K、S、Ni、Co 和 O 元素在所研究的晶体结构中的存在通过使用扫描电子显微镜的 EDS 光谱证实，并且在 ICP-OES 技术的帮助下进行了包括 Li 的定量。100-3600 cm-1 范围内的拉曼光谱证实了晶体结构中存在四面体 (SO4)、八面体配合物 Ni(H2O)6、Co(H2O)6 和 H2O 分子。我们的 UV-vis 研究表明，混合晶体在紫外 (200-350 nm) 和红外 (750-1000 nm) 区域具有良好的光学透明度。合成晶体的直接和间接光能隙由 Tauc 曲线确定。由于晶体网络中锂离子的存在，样品晶体的 XRD 衍射图没有显示任何特定的变化。