Layered manganese oxides structures: Micro-Raman and selected mobile Raman spectroscopic studies

IF 2.4 3区 化学 Q2 SPECTROSCOPY Journal of Raman Spectroscopy Pub Date : 2023-12-25 DOI:10.1002/jrs.6646
Eva Vermeersch, Filip Košek, Johan De Grave, Jan Jehlička, Anastasia Rousaki
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Abstract

The main structural building blocks that form manganese oxides are MnO6 octahedra; these share corners and edges to construct specific structures, which can either be tunneled or layered. In the layered structures, that is, phyllomanganates, the MnO6 octahedra form sheets, which, in turn, alternate with sheets of metal oxides and H2O. These metal ions can vary (Zn, Co, Ni, Al, Li, …) and give rise to an entire range of different metal oxides. The characterization of these layered materials is important as they have various economical/industrial applications. Birnessite-type materials, a specific type of layered manganese oxides, are widely studied for their use as cathode materials in alkali-ion batteries. Phyllomanganates are also commonly found as constituents in sediments and soils or as coatings on rock surfaces. Their natural occurrence as black colored components have ensured that these minerals were also applied as pigments in archaeological and historical contexts. They are, for example, often found in rock art paintings and on pottery. As the oxides are used in unique archaeological objects, Raman spectroscopy is an evident choice for characterization due to its non-destructive nature of analysis. In the current study, five mineral samples of (layered) manganese oxides are analyzed with different Raman instrumentations, including mobile systems and a benchtop micro-Raman setup. The characterization of each selected manganese oxide and their comparison with literature data is discussed for the micro-Raman instrumentation. In addition, the ability of identifying and characterizing layered manganese oxides and the possible challenges when using mobile instrumentation are discussed as well.

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层状锰氧化物结构:显微拉曼光谱和选定移动拉曼光谱研究
形成锰氧化物的主要结构单元是 MnO6 八面体;这些八面体共用角和边来构建特定的结构,这些结构可以是隧道式的,也可以是层状的。在层状结构(即植物锰酸盐)中,MnO6 八面体形成薄片,而薄片又与金属氧化物和 H2O 交替出现。这些金属离子可以是不同的(锌、钴、镍、铝、锂......),并产生各种不同的金属氧化物。这些层状材料具有各种经济/工业用途,因此其特性分析非常重要。桦锰酸盐型材料是一种特殊的层状锰氧化物,因其可用作碱性离子电池的阴极材料而被广泛研究。植物锰酸盐也是沉积物和土壤中常见的成分,或者是岩石表面的涂层。由于这些矿物天然具有黑色成分,因此在考古和历史研究中也被用作颜料。例如,它们经常出现在岩画和陶器上。由于这些氧化物被用于独特的考古物品中,拉曼光谱具有非破坏性的分析特性,因此显然是表征的最佳选择。在当前的研究中,使用不同的拉曼仪器(包括移动系统和台式微型拉曼装置)对五种(层状)锰氧化物矿物样本进行了分析。针对微拉曼仪器,讨论了每个选定氧化锰的特征及其与文献数据的比较。此外,还讨论了识别和表征层状锰氧化物的能力以及使用移动仪器时可能遇到的挑战。
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来源期刊
CiteScore
5.40
自引率
8.00%
发文量
185
审稿时长
3.0 months
期刊介绍: The Journal of Raman Spectroscopy is an international journal dedicated to the publication of original research at the cutting edge of all areas of science and technology related to Raman spectroscopy. The journal seeks to be the central forum for documenting the evolution of the broadly-defined field of Raman spectroscopy that includes an increasing number of rapidly developing techniques and an ever-widening array of interdisciplinary applications. Such topics include time-resolved, coherent and non-linear Raman spectroscopies, nanostructure-based surface-enhanced and tip-enhanced Raman spectroscopies of molecules, resonance Raman to investigate the structure-function relationships and dynamics of biological molecules, linear and nonlinear Raman imaging and microscopy, biomedical applications of Raman, theoretical formalism and advances in quantum computational methodology of all forms of Raman scattering, Raman spectroscopy in archaeology and art, advances in remote Raman sensing and industrial applications, and Raman optical activity of all classes of chiral molecules.
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