Raman spectroscopy of phosphates of the variscite mineral group

Frost, Ray L., Weier, Matt L., Erickson, Kristy L., Carmody, Onuma, & Mills, Stuart (2004) Raman spectroscopy of phosphates of the variscite mineral group. Journal of Raman Spectroscopy, 35(12), pp. 1047-1055.

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Abstract

Raman spectra of phosphates of the variscite mineral group, namely strengite, variscite, metavariscite and phosphosiderite, were obtained at 298 and 77 K using a thermal stage and complemented with selected infrared data using a diamond attenuated total reflection cell. Multiple phosphate stretching bands are observed. Bands for strengite at 1006, 1012 and 1026 cm-1 at 298 K and at 997, 1006, 1014 and 1027 cm-1 at 77 K are observed. Variscite is characterized by PO stretching vibrations at 1023, 1005 and 938 cm-1 and phosphosiderite by bands at 1009 and 993 cm-1. These minerals are readily identified by their Raman spectrum both in the PO stretching region and in the low-wavenumber region. Multiple bands attributed to the bending modes of PO4 are identified for each of the minerals. A model is proposed involving non-hydrogen-bonded PO4 and strongly hydrogen-bonded PO4 units together with [Al or Fe(OH)2]+ ·(H2PO4)2--type species. Raman spectroscopy shows that at the molecular level multiple species of phosphate anions exist for the variscite phosphate minerals.

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ID Code: 22119
Item Type: Journal Article
Refereed: Yes
DOI: 10.1002/jrs.1251
ISSN: 0377-0486
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2004 John Wiley and Sons
Deposited On: 17 Jun 2009 13:05
Last Modified: 02 Mar 2012 14:24

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