Raman spectroscopic study of the selenite mineral - ahlfeldite NiSeO3.2H2O
Raman spectroscopy has been used to study the selenite mineral ahlfeldite. A comparison is made with the Raman spectra of chalcomenite, cobaltomenite and clinochalcomenite. Selenite minerals are characterised by the position of the symmetric stretching mode which is observed at higher wavenumbers than the antisymmetric stretching mode. The selenite ion has C3v symmetry and four modes, 2A1 and 2E. These modes are observed at 813, 472 cm-1 (A1) and 685, 710, 727 and 367 and 396 cm-1 (E). Bands assigned to the water stretching vibrations are observed for ahlfeldite at 3385 cm-1, for chalcomenite at 2953, 3184 and 3506 cm-1 and for clinochalcomenite at 2909, 3193 and 3507 cm-1. A comparison of the Raman spectra of chalcomenite, clinochalcomenite and cobaltomenite is made. The position of these bands enabled hydrogen bond distances in the selenite structure to be estimated. Hydrogen bond distances for ahlfeldite, chalcomenite and clinochalcomenite were determined to be similar.
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|Item Type:||Journal Article|
|Keywords:||selenite, Raman spectroscopy, ahlfeldite, chalcomenite, clinochalcomenite, cobaltomenite, marthozite, mandarinoite|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > School of Physical & Chemical Sciences
|Copyright Owner:||Copyright 2009 John Wiley & Sons|
|Deposited On:||12 May 2009 21:47|
|Last Modified:||01 Nov 2013 14:04|
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