An application of near-infrared and mid-infrared spectroscopy to the study of selected minerals
Frost, Ray L., Reddy, B. Jagannadha, & Keeffe, Eloise C. (2010) An application of near-infrared and mid-infrared spectroscopy to the study of selected minerals. Radiation Effects and Defects in Solids, 165(3), pp. 193-205.
Near-infrared spectroscopy is a somewhat unutilised technique for the study of minerals. The technique has the ability to determine water content, hydroxyl groups and transition metals. In this paper we show the application of NIR spectroscopy to the study of selected minerals. The structure and spectral properties of two Cu-tellurite minerals graemite and teineite are compared with bismuth containing tellurite mineral smirnite by the application of NIR and IR spectroscopy. The position of Cu2+ bands and their splitting in the electronic spectra of tellurites are in conformity with octahedral geometry distortion.
The spectral pattern of smirnite resembles graemite and the observed band at 10855 cm-1 with a weak shoulder at 7920 cm-1 is identified as due to Cu2+ ion. Any transition metal impurities may be identified by their bands in this spectral region. Three prominent bands observed in the region of 7200-6500 cm-1 are the overtones of water whilst the weak bands observed near 6200 cm-1in tellurites may be attributed to the hydrogen bonding between (TeO3)2- and H2O. The observation of a number of bands centred at around 7200 cm-1 confirms molecular water in tellurite minerals. A number of overlapping bands in the low wavenumbers 4500-4000 cm-1 is the result of combinational modes of (TeO3)2−ion. The appearance of the most intense peak at 5200 cm-1 with a pair of weak bands near 6000 cm-1 is a common feature in all the spectra and is related to the combinations of OH vibrations of water molecules, and bending vibrations ν2 (δ H2O). Bending vibrations δ H2O observed in the IR spectra shows a single band for smirnite at 1610 cm-1. The resolution of this band into number of components is evidenced for non-equivalent types of molecular water in graemite and teineite. (TeO3)2- stretching vibrations are characterized by three main absorptions at 1080, 780 and 695 cm-1.
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|Item Type:||Journal Article|
|Keywords:||tellurites, graemite, teineite, smirnite, near-infrared and mid-infrared spectroscopy, Cu2+, (TeO3)2−|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600)|
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
|Divisions:||Past > Schools > Chemistry|
Past > QUT Faculties & Divisions > Faculty of Science and Technology
|Copyright Owner:||Copyright 2010 Taylor & Francis|
|Copyright Statement:||This is an electronic version of an article published in Frost, Ray L. and Reddy, B. Jagannadha and Keeffe, Eloise C. (2010) An application of near-infrared and mid-infrared spectroscopy to the study of selected minerals. Radiation Effects and Defects in Solids, 165(3). pp. 193-205. Radiation Effects and Defects in Solids is available online at informaworldTM|
|Deposited On:||05 Mar 2010 10:46|
|Last Modified:||01 Mar 2012 00:23|
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