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Near-infrared spectroscopy of aurichalcite (Zn,Cu2+)5(CO3)2(OH)6

Frost, Ray L. & Reddy, B. Jagannadha (2007) Near-infrared spectroscopy of aurichalcite (Zn,Cu2+)5(CO3)2(OH)6. Journal of Near Infrared Spectroscopy, 15(2), pp. 115-121.

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Abstract

In this endeavour near-infrared spectroscopy studies show an evidence for variable composition in aurichalcite minerals of zinc copper carbonate hydroxides. The observation of a broad feature in the electronic part of the spectrum around 11500 cm-1 (0.87 µm) is a strong indication of Cu2+ substitution for Zn2+ in the mineral. Overtones of OH vibrations in the spectra from 7250 to 5400 cm-1 (1.38 to 1.85µm) show strong hydrogen bonding in these carbonates. A band common to spectra of all carbonates appears near 5400 cm-1 (1.85 µm) due to the combination of both OH-stretching and HOH-bending vibrations, may be attributed to adsorbed water by the minerals. Aurichalcite minerals display a spectral sequence of five absorpton bands with variation of both band positions and intenities and this is the chief spectral feature observed in the range 5200 -5100 cm-1 (1.92 - 2.38 µm) due to vibrational processes of the carbonate ion. The frequency shifts of carbonate bands suggest the effect of divalent cations and or variations of Zn/Cu ratio in aurichalcite minerals.

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ID Code: 7124
Item Type: Journal Article
Additional Information: Self-archiving of the author-version is not yet supported by this publisher. For more information, please refer to the journal's website (see link) or contact the author. Author contact details: r.frost@qut.edu.au
Keywords: aurichalcite, hydrozincite, hydroxy carbonates, near, infrared spectroscopy, Cu2+, Zn2+, overtones and combination bands of OH, and CO32, fundamentals
DOI: 10.1255/jnirs.722
ISSN: 0967-0335
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Colloid and Surface Chemistry (030603)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2007 NIR Publications
Deposited On: 24 Apr 2007
Last Modified: 29 Feb 2012 23:38

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