ThermoRaman spectroscopic study of kintoreite

Frost, Ray L. and Weier, Matt L. and Martens, Wayde N. and Mills, Stuart J. (2006) ThermoRaman spectroscopic study of kintoreite. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 63(2). pp. 282-288.

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DOI: 10.1016/j.saa.2005.05.011

Abstract

ThermoRaman spectroscopy has been used to study the molecular structure and thermal decomposition of kintoreite, a phosphated jarosite PbFe3(PO4)2(OH,H2O)6. Infrared spectroscopy shows the presence of significant amounts of water in the structure as well as hydroxyl units. In contrast no water was observed for segnitite (the arsenojarosite) as determined by infrared spectroscopy. The Raman spectra at 77 K exhibit bands at 974.6, 1003.2 and 866.5 cm-1. These bands are attributed to the symmetric stretching vibrations of (PO4)3-, (SO4)3- and (AsO4)3- units. Raman spectroscopy confirms the presence of both arsenate and phosphate in the structure. Bands at 583.7 and 558.1 cm-1 in the 77 K spectrum are assigned to the ν4 (PO4)3- bending modes. ThermoRaman spectroscopy of kintoreite identifies the temperature range of dehydration and dehydroxylation.

ID Code:	3499
Item Type:	Journal Article
Additional Information:	Kinoreite is one of the jarosite group of minerals. The sulphate has been repleced by phosphate.
Keywords:	arsenate, segnitite, kintoreite, sulphate, phosphate jarosite, Raman spectroscopy
ISSN:	1386-1425
Subjects:	Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000)
Divisions:	QUT Faculties and Divisions > Faculty of Science and Technology
Copyright Owner:	Copyright 2006 Elsevier
Copyright Statement:	Reproduced in accordance with the copyright policy of the publisher.
Deposited On:	08 Feb 2006
Last Modified:	13 May 2009 01:42

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