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Low temperature synthesis and characterisation of lecontite, (NH4)Na(SO4).2H2O

Kloprogge, J. Theo, Broekmans, Maarten, Duong, Loc V., Martens, Wayde N., Hickey, Leisel, & Frost, Ray L. (2006) Low temperature synthesis and characterisation of lecontite, (NH4)Na(SO4).2H2O. Journal of Material Science, 41(11), pp. 3535-3539.

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Abstract

Lecontite, (NH4)Na(SO4).2H2O, was synthesised at room temperature in high purity compared to earlier work with a minor impurity of mascagnite, (NH4)2SO4. Rietveld refinement of the XRD results confirmed the crystal structure and unit cell dimensions as published earlier. Raman and Infrared spectroscopy, in conjunction with factor group analysis, resulted in a complex pattern of overlapping sulphate, NH and OH modes. The NH modes υ1 was observed around 2880 cm-1, υ2 around 1700 cm-1 overlapping with water OH-bending modes, υ3 around 3300 cm-1 overlapping with water OH-stretching modes around 3023, 3185 and 3422 cm-1, and υ4 around 1432, 1447 and 1462 cm-1. The sulphate group in the crystal structure displays a decrease in symmetry from Td as evidenced by the activation of the ν1 mode at 982 cm-1 and the ν2 mode around 452 cm-1 in the Infrared spectrum. The υ3 mode shows clear splitting in the infrared spectra with a strong band at 1064 cm-1 accompanied by two shoulders at 1107 and 1139 cm-1. The Raman spectra show three weak bands at 1068, 1109 and 1135 cm-1 with a shoulder at 1155 cm-1. Similar splitting was observed for the υ4 mode around 611 and 632 cm-1 in the Infrared and Raman spectra, respectively.

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ID Code: 5408
Item Type: Journal Article
Keywords: Infrared spectroscopy, lecontite, Raman Spectroscopy, Rietveld refinement, Scanning Electron Microscopy, X, ray diffraction
DOI: 10.1007/s10853-005-5909-5
ISSN: 1573-4803
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Mineralogy and Crystallography (040306)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2006 Springer
Copyright Statement: The original publication is available at SpringerLink http://www.springerlink.com
Deposited On: 08 Nov 2006
Last Modified: 29 Feb 2012 23:26

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