Abstract

Journal of Near Infrared Spectroscopy
Volume 15 Issue 2, Pages 115–121 (2007)
doi: 10.1255/jnirs.722

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

B. Jagannadha Reddy and Ray L. Frost
Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia

In this endeavour, near infrared spectroscopy studies show evidence of variable composition in aurichalcite minerals of zinc copper carbonate hydroxides. The observation of a broad feature in the electronic part of the spectrum around 11,500 cm–1 (870 nm) 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 (1380–1850 nm) show strong hydrogen bonding in these carbonates. A band common to spectra of all carbonates appears near 5400–cm–1 (1850 nm) due to the combination of both OH-stretching and HOH-bending vibrations, which may be attributed to adsorbed water. Aurichalcite minerals display a spectral sequence of five absorption bands with variation of both band positions and intensities and this is the chief spectral feature observed in the range 5200–5100 cm–1 (1920–2380 nm) due to vibrational processes of the carbonate ion. The frequency shift of carbonate bands suggests the effect of divalent cations and/or variations of the Zn/Cu ratio in aurichalcite minerals.

Keywords: aurichalcite, hydrozincite, hydroxy carbonates, near infrared spectroscopy, Cu2+, Zn2+, overtones and combination bands of OH– and CO32– fundamentals

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