Near infrared spectroscopy of the smithsonite minerals

Frost, Ray L., Reddy, B. Jagannadha, Hales, Matthew C., & Wain, Daria L. (2008) Near infrared spectroscopy of the smithsonite minerals. Journal of Near Infrared Spectroscopy, 16(2), pp. 75-82.

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The importance of NIR spectroscopy has been successfully demonstrated in the present study of smithsonite minerals. The fundamental observations in the NIR spectra, in addition to the anions of OH- and CO32- are Fe and Cu in terms of cation content. These ions exhibit broad absorption bands ranging from 13000 to 7000cm-1 (0.77 to 1.43 µm). One broad diagnostic absorption feature centred at 9000 cm-1 (1.11 µm) is the result of ferrous ion spin allowed transition, (5T2g ® 5Eg). The splitting of this band (>1200 cm-1) is a common feature in all the spectra of the studied samples. The light green coloured sample from Namibia show two Cu(II) bands in NIR at 8050 and 10310 cm-1 (1.24 and 0.97 µm) are assigned to 2B1g ® 2A1g and 2B1g ® 2B2g transitions. The effects of structural cations substitution (Ca2+, Fe2+, Cu2+, Cd2+ and Zn2+) on band shifts in the electronic spectra1 region of 11000-7500 cm-1 (0.91-1.33 µm) and vibrational modes of OH- and CO32- anions in 7300 to 4000 cm-1 (1.37-2.50 µm) region were used to distinguish between the smithsonites.

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13 citations in Web of Science®
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ID Code: 41981
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: smithsonite, cadmium smithsonite, hydroxy carbonates; NIR spectroscopy, divalent copper, ferrous ion
DOI: 10.1255/jnirs.765
ISSN: 0967-0335
Subjects: 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 2008 NIR Publications
Deposited On: 15 Jun 2011 22:45
Last Modified: 03 Mar 2012 09:25

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