Raman and infrared spectroscopy of selected vanadates

Frost R.L., Erickson K.L., Weier M.L. and Carmody O. (2005) Raman and infrared spectroscopy of selected vanadates. Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, 61 5: 829-834. doi:10.1016/j.saa.2004.06.006


Author Frost R.L.
Erickson K.L.
Weier M.L.
Carmody O.
Title Raman and infrared spectroscopy of selected vanadates
Journal name Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy   Check publisher's open access policy
ISSN 1386-1425
Publication date 2005
Sub-type Article (original research)
DOI 10.1016/j.saa.2004.06.006
Volume 61
Issue 5
Start page 829
End page 834
Total pages 6
Subject 1607 Social Work
Abstract 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 965 cm -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 (V5O 14)3- units. Barnesite is characterised by a single Raman band at 1010 cm-1, whilst hummerite has Raman bands at 999 and 962 cm-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 953 cm-1. These bands are assigned to ν1 symmetric stretching modes of (V6O 16)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 ν3 antisymmetric stretching of (V10O28)6- units or (V5O 14)3- units. Because of the complexity of the spectra in the low wavenumber region assignment of bands is difficult. Bands are observed in the 404-458 cm-1 region and are assigned to the ν2 bending modes of (V10O28)6- units or (V 5O14)3- units. Raman bands are observed in the 530-620 cm-1 region and are assigned to the ν4 bending modes of (V10O28)6- units or (V 5O14)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.
Keyword Barnesite
Hewettite
Huemulite
Hummerite
Infrared spectroscopy
Metahewettite
Pascoite
Raman spectroscopy
Vanadates
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
Versions
Version Filter Type
Citation counts: Scopus Citation Count Cited 52 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Tue, 14 Jun 2016, 05:08:01 EST by System User