Raman spectroscopy of the copper chloride minerals nantokite, eriochalcite and claringbullite – implications for copper corrosion

Authors: Frost, Ray L.; Williams, Peter A.; Kloprogge, J. Theo; Martens, Wayde

Source: Neues Jahrbuch für Mineralogie - Monatshefte, Volume 2003, Number 10, 1 October 2003 , pp. 433-445(13)

Publisher: E. Schweizerbart'sche Verlagsbuchhandlung

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Abstract:

The application of Raman spectroscopy to the study of the copper chloride minerals nantokite, eriochalcite and claringbullite has enabled the vibrational modes for the CuCl, CuOH and CuOH₂ to be determined. Nantokite is characterised by bands at 205 and 155 cm^-1 attributed to the transverse and longitudinal optic vibrations. Nantokite also has an intense band at 463 cm^-1, eriochalcite at 405 and 390 cm^-1 and claringbullite at 511 cm^-1. These bands are attributed to CuO stretching modes. Water librational bands at around 672 cm^-1 for eriochalcite have been identified and hydroxyl deformation modes of claringbullite at 970, 906 and 815 cm^-1 are observed. Spectra of the three minerals are so characteristically different that the minerals are readily identified by Raman spectroscopy. The minerals are often determined in copper corrosion products by X-ray diffraction. Raman spectroscopy offers a rapid, in-situ technique for the identification of these corrosion products.

Keywords: COPPER; CHLORIDE; RAMAN SPECTROSCOPY; NANTOKITE; ERIOCHALCITE AND CLARINGBULLITE

Document Type: Regular paper

DOI: http://dx.doi.org/10.1127/0028-3649/2003/2003-0433

Publication date: 2003-10-01