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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Raman and infrared spectroscopy of selected vanadates
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Raman and infrared spectroscopy of selected vanadates

机译：选定钒酸盐的拉曼光谱和红外光谱

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Raman and infrared spectroscopy has been used to study the structure of selected vanadates including pascoite, huemulite, barnesite, hewettite, metahewettite, hummerite. Pascoite, rauvite and huemulite are examples of simple salts involving the decavanadates anion (V10O28)(6-). Decavanadate consists of four distinct VO6 units which are reflected in Raman bands at the higher wavenumbers. The Raman spectra of these minerals are characterised by two intense bands at 991 and 965cm(-1). Four pascoite Raman bands are observed at 991, 965, 958 and 905 cm(-1) and originate from four distinct VO6 sites. The other minerals namely barnesite, hewettite, metahewettite and hummerite have similar layered structures to the decavanadates but are based upon (V5O14)(3-) units. Barnesite is characterised by a single Raman band at 1010cm(-1), whilst hummerite has Raman bands at 999 and 962cm(-1). The absence of four distinct bands indicates the overlap of the vibrational modes from two of the VO6 sites. Metarossite is characterised by a strong band at 953cm(-1). These bands are assigned to nu(1) symmetric stretching modes of (V6O16)(2-) units and terminal VO3 units. In the infrared spectra of these minerals, bands are observed in the 837-860 cm(-1) and in the 803-833 cm(-1) region. In some of the Raman spectra bands are observed for pascoite, hummerite and metahewettite in similar positions. These bands are assigned to nu(3) antisymmetric stretching Of (V10O28)(6-) units or (V5O14)(3-) units. Because of the complexity of the spectra in the low wavenumber region assignment of bands is difficult. Bands are observed in the 404-458cm(-1) region and are assigned to the nu(2) bending modes Of (V10O28)(6-) units or (V5O14)(3-) units. Raman bands are observed in the 530-620cm(-1) region and are assigned to the nu(4) bending modes Of (V10O28)(6-) units or (V5O14)(3-) units. The Raman spectra of the vanadates in the low wavenumber region are complex with multiple overlapping bands which are probably due to VO subunits and MO bonds. (C) 2004 Elsevier B.V. All rights reserved.
机译：拉曼光谱和红外光谱已用于研究所选钒酸盐的结构，包括滑石，辉石，钡镁石，hewettite，methewettite，hummerite。滑石粉，云母粉和辉石粉是涉及十钒酸根阴离子（V10O28）（6-）的简单盐的实例。十钒酸盐由四个不同的VO6单元组成，在更高的波数下会在拉曼波段中反射。这些矿物的拉曼光谱的特征是在991和965cm（-1）处有两个强带。在991、965、958和905 cm（-1）处观察到四个辉石拉曼谱带，它们起源于四个不同的VO6位点。其他矿物，即菱镁矿，hewettite，metahewettite和hummerite具有与十钒酸盐相似的层状结构，但基于（V5O14）（3-）单位。 Barnesite的特征是在1010cm（-1）处有一个拉曼带，而悍马石在999和962cm（-1）处有拉曼带。缺少四个不同的带表示来自两个VO6位点的振动模式重叠。偏锰矿的特征是在953cm（-1）处有很强的条带。这些频段分配给（V6O16）（2-）单元和终端VO3单元的nu（1）对称拉伸模式。在这些矿物的红外光谱中，在837-860 cm（-1）和803-833 cm（-1）区域观察到谱带。在某些拉曼光谱中，在类似位置观察到了辉石，悍马和变质白铁矿的谱带。这些频段分配给（V10O28）（6-）单元或（V5O14）（3-）单元的nu（3）反对称拉伸。由于在低波数区域中频谱的复杂性，频带分配很难。在404-458cm（-1）区域中观察到带，并将其分配给（V10O28）（6-）单位或（V5O14）（3-）单位的nu（2）弯曲模式。在530-620cm（-1）区域观察到拉曼带，并将其分配给（V10O28）（6-）单元或（V5O14）（3-）单元的nu（4）弯曲模式。低波数区钒酸盐的拉曼光谱很复杂，有多个重叠带，这可能是由于VO亚基和MO键所致。 （C）2004 Elsevier B.V.保留所有权利。

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