Near-infrared spectroscopy of aurichalcite (Zn,Cu2+)5(CO3)2(OH)6
(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.
| Item Type: | Journal Article |
|---|---|
| Status: | Published |
| Keywords: | aurichalcite,hydrozincite, hydroxy carbonates, near-infrared spectroscopy, Cu2+, Zn2+, overtones and combination bands of OH- and CO32- fundamentals |
| Subjects: | 250000 Chemical Sciences > 250100 Physical Chemistry (incl. Structural) > 250104 Chemical Spectroscopy 250000 Chemical Sciences > 250100 Physical Chemistry (incl. Structural) > 250103 Colloid and Surface Chemistry |
| ID Code: | 7124 |
| Deposited By: | Frost, Ray |
| Deposited On: | 24 April 2007 |
| Alternative Locations: | http://dx.doi.org/10.1255/jnirs.722 |
| Copyright Owner: | Copyright 2007 NIR Publications |
| 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 |