A Raman spectroscopic study of synthetic giniite

Frost, Ray L. and Wills, Rachael-Anne and Martens, Wayde N. (2007) A Raman spectroscopic study of synthetic giniite. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 66(1). pp. 42-47.

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DOI: 10.1016/j.saa.2006.02.018

Abstract

The mineral giniite has been synthesised and characterised by XRD, SEM and Raman and infrared spectroscopy. SEM images of the olive green giniite display a very unusual image of pseudo-spheres with roughened surfaces of around 1 to 10 microns in size. The face to face contact of the spheres suggests that the spheres are colloidal and carry a surface charge. Raman spectroscopy proves the (PO4)3- units are reduced in symmetry and in all probability more than one type of phosphate unit is found in the structure. Raman bands at 77 K are observed at 3380 and 3186 cm-1 with an additional sharp band at 3100 cm-1. The first two bands are assigned to water stretching vibrations and the latter to an OH stretching band. Intense Raman bands observed at 396, 346 and 234 cm-1are attributed to the FeO stretching vibrations. The giniite phosphate units are characterised by two Raman bands at 1023 and 948 cm-1 assigned to symmetric stretching mode of the (PO4)3- units. A complex band is observed at 460.5 cm-1 with additional components at 486.8 and 445.7 cm-1 attributed to the ν2 bending modes suggesting a reduction of symmetry of the (PO4)3- units.

ID Code:	5741
Item Type:	Journal Article
Keywords:	giniite, synthesis, phosphate, kintoreite, segnitite, scanning electron microscopy, Raman spectroscopy
ISSN:	1386-1425
Divisions:	QUT Faculties and Divisions > Faculty of Science and Technology
Copyright Owner:	Copyright 2007 Elsevier
Copyright Statement:	Reproduced in accordance with the copyright policy of the publisher.
Deposited On:	12 Mar 2007
Last Modified:	23 Jan 2009 04:31

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