Electronic and vibrational spectra of Mn rich sursassite
Frost, Ray L., Palmer, Sara J., & Reddy, B. Jagannadha (2007) Electronic and vibrational spectra of Mn rich sursassite. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 66(2), pp. 312-317.
The optical spectrum of Mn2+ in octahedral coordination for sursassite is characterized by well resolved bands at 580, 515, 470, 390, 340, and 295 nm (17240, 19420, 21280, 25640, 29410 and 33900 cm-1). Crystal field parameters evaluated from the observed bands are Dq = 690, B = 680 and C = 2800 cm-1. A broad band centred around 13000 cm-1 attributed to Fe(III) ion is an impurity in sursassite confirmed from EDX analysis. Vibrational spectra have been investigated both by IR and Raman spectroscopy. The correlation between vibrational modes and the structural properties of the manganese silicate, sursassite, is made and compared with other silicates. Two vibrational modes of CO32- observed; the antisymmetric stretching mode (￮3) at 1420 cm-1 (IR active) and the out-of-plane bending mode ( ￮2) (IR and Raman active) at ~875 cm-1. This confirms the Mn rich phases in sursassite as observed from SEM probably a Mn carbonate-rhodochrosite.
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|Item Type:||Journal Article|
|Keywords:||XRD and SEM analyses, UV, Vis and NIR spectroscopy, sursassite, Mn(II) distorted octahedral symmetry, overtone and combination bands, layered silicates, vibrational spectroscopy|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000)|
|Divisions:||Past > QUT Faculties & 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:||01 Feb 2007 00:00|
|Last Modified:||05 May 2014 23:44|
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