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The role of dysprosium levels in the formation of mixed oxidation states within spinel MnCo2−xDyxO4 nanocrystalline powders
Journal of Electron Spectroscopy and Related Phenomena ( IF 1.9 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.elspec.2020.146952
Tholkappiyan Ramachandran , Selvi Natarajan , Fathalla Hamed

Abstract In this work, glycine-aided combustion synthesis of spinel-type MnCo2−xDyxO4 (x = 0.02, 0.04 and 0.06 %) nanocrystalline powders is presented. The mechanism involved in the chemical synthesis is briefly discussed. The integrity of the synthesized nanocrystalline powders was investigated and evaluated in correlation with dysprosium levels. Powder X-ray diffraction and Fourier-transform infrared spectroscopy studies confirmed the formation of pure spinel phase with cubic crystal structure. Scanning electron microscopy examinations revealed different agglomerated porous spongy morphologies that varied with different dysprosium levels. The analyses of X-ray photoelectron spectroscopy spectra showed different mixed oxidation states and cationic distributions among the octahedral and tetrahedral sites within the spinel structure as a function of dysprosium levels. It is suggested that MnCo2−xDyxO4 nanocrystalline powders with different morphologies and mixed oxidation states can be tailored via facile synthesis route.

中文翻译:

镝水平在尖晶石 MnCo2−xDyxO4 纳米晶粉末中混合氧化态形成中的作用

摘要 在这项工作中,提出了尖晶石型 MnCo2−xDyxO4 (x = 0.02、0.04 和 0.06 %) 纳米晶粉末的甘氨酸辅助燃烧合成。简要讨论了化学合成中涉及的机制。研究并评估了合成纳米晶粉末的完整性与镝水平的相关性。粉末 X 射线衍射和傅里叶变换红外光谱研究证实了具有立方晶体结构的纯尖晶石相的形成。扫描电子显微镜检查显示不同的附聚多孔海绵状形态随不同的镝含量而变化。X 射线光电子能谱分析表明,尖晶石结构内八面体和四面体位点之间的不同混合氧化态和阳离子分布是镝水平的函数。建议可以通过简便的合成路线定制具有不同形态和混合氧化态的 MnCo2−xDyxO4 纳米晶粉末。
更新日期:2020-07-01
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