Article ID Journal Published Year Pages File Type
1231692 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2011 5 Pages PDF
Abstract
The mineral delvauxite CaFe43+(PO4,SO4)2(OH)8·4-6H2O has been characterised by Raman spectroscopy and infrared spectroscopy. The mineral is associated with the minerals diadochite and destinezite. Delvauxite appears to vary in crystallinity from amorphous to semi-crystalline. The mineral is often X-ray non-diffracting. The minerals are found in soils and may be described as 'colloidal' minerals. Vibrational spectroscopy enables determination of the molecular structure of delvauxite. Bands are assigned to phosphate and sulphate stretching and bending modes. Two symmetric stretching modes for both the phosphate and sulphate symmetric stretching modes support the concept of non-equivalent phosphate and sulphate units in the mineral structure. Multiple water bending and stretching modes imply that non-equivalent water molecules in the structure exist with different hydrogen bond strengths.
Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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