Raman spectroscopy of newberyite, hannayite and struvite

The phosphate minerals hannayite, newberyite and struvite have been studied by Raman spectroscopy using a thermal stage. Hannayite and newberyite are characterised by an intense band at around 980 cm −1 assigned to the v 1 symmetric stretching vibration of the HPO 4 units. In contrast the symmetric...

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Bibliographic Details
Published in:Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2005-11, Vol.62 (1), p.181-188
Main Authors: Frost, Ray L., Weier, Matt L., Martens, Wayde N., Henry, Dermot A., Mills, Stuart J.
Format: Article
Language:English
Subjects:
Hannayite
Magnesium Compounds - chemistry
Molecular Conformation
Newberryite
Phosphate
Phosphates - chemistry
Phosphoric Acids - chemistry
Raman spectroscopy
Spectrum Analysis, Raman - methods
Struvite
Thermodynamics
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Summary:The phosphate minerals hannayite, newberyite and struvite have been studied by Raman spectroscopy using a thermal stage. Hannayite and newberyite are characterised by an intense band at around 980 cm −1 assigned to the v 1 symmetric stretching vibration of the HPO 4 units. In contrast the symmetric stretching mode is observed at 942 cm −1 for struvite. The Raman spectra are characterised by multiple v 3 anti-symmetric stretching bands and v 2 and v 4 bending modes indicating strong distortion of the HPO 4 and PO 4 units. Hannayite and newberyite are defined by bands at 3382 and 3350 cm −1 attributed to HOPO 3 vibrations and hannayite and struvite by bands at 2990, 2973 and 2874 assigned to NH 4 + bands. Raman spectroscopy has proven most useful for the analysis of these ‘cave’ minerals where complex paragenetic relationships exist between the minerals.
ISSN:1386-1425
DOI:10.1016/j.saa.2004.12.024