Near-infrared spectroscopy of aurichalcite (Zn,Cu2+)5(CO3)2(OH)6
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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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|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: firstname.lastname@example.org|
|Keywords:||aurichalcite, hydrozincite, hydroxy carbonates, near, infrared spectroscopy, Cu2+, Zn2+, overtones and combination bands of OH, and CO32, fundamentals|
|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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