Infrared and raman spectroscopic characterization of the silicate mineral gilalite Cu5Si6O17.7H2O

Lopez Toro, Andres, Frost, Ray, Scholz, Ricardo, Xi, Yunfei, & Amaral, Aline (2014) Infrared and raman spectroscopic characterization of the silicate mineral gilalite Cu5Si6O17.7H2O. Spectroscopy Letters: an international journal for rapid communication, 47(6), pp. 488-493.

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Abstract

Gilalite is a copper silicate mineral with a general formula of Cu5Si6O17 · 7H2O. The mineral is often found in association with another copper silicate mineral, apachite, Cu9Si10O29 · 11H2O. Raman and infrared spectroscopy have been used to characterize the molecular structure of gilalite. The structure of the mineral shows disorder, which is reflected in the difficulty of obtaining quality Raman spectra. Raman spectroscopy clearly shows the absence of OH units in the gilalite structure. Intense Raman bands are observed at 1066, 1083, and 1160 cm−1.

The Raman band at 853 cm−1 is assigned to the –SiO3 symmetrical stretching vibration and the low-intensity Raman bands at 914, 953, and 964 cm−1 may be ascribed to the antisymmetric SiO stretching vibrations. An intense Raman band at 673 cm−1 with a shoulder at 663 cm−1 is assigned to the ν4 Si-O-Si bending modes. Raman spectroscopy complemented with infrared spectroscopy enabled a better understanding of the molecular structure of gilalite.

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ID Code: 80525
Item Type: Journal Article
Refereed: Yes
Keywords: gilalite, infrared spectroscopy, Raman spectroscopy, silicate
DOI: 10.1080/00387010.2013.817432
ISSN: 0038-7010
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > ANALYTICAL CHEMISTRY (030100)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 21 Jan 2015 22:48
Last Modified: 30 Mar 2015 03:04

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