Article ID Journal Published Year Pages File Type
9757008 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2005 8 Pages PDF
Abstract
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 v1 symmetric stretching vibration of the HPO4 units. In contrast the symmetric stretching mode is observed at 942 cm−1 for struvite. The Raman spectra are characterised by multiple v3 anti-symmetric stretching bands and v2 and v4 bending modes indicating strong distortion of the HPO4 and PO4 units. Hannayite and newberyite are defined by bands at 3382 and 3350 cm−1 attributed to HOPO3 vibrations and hannayite and struvite by bands at 2990, 2973 and 2874 assigned to NH4+ bands. Raman spectroscopy has proven most useful for the analysis of these 'cave' minerals where complex paragenetic relationships exist between the minerals.
Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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