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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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Abstract

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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10 citations in Web of Science®

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ID Code: 41981
Item Type: Journal Article
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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