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Electron paramagnetic resonance, optical absorption and IR spectroscopic studies of the sulphate mineral apjohnite

Frost, Ray L., Reddy, S. Lakshmi , Reddy, B. Jagannatha, Wain, Daria L., Reddy, G. Siva , & Martens, Wayde N. (2006) Electron paramagnetic resonance, optical absorption and IR spectroscopic studies of the sulphate mineral apjohnite. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 65(5), pp. 1227-1233.

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Abstract

Apjohnite, a naturally occurring Mn-bearing pseudo-alum from Terlano, Bolzano, Italy has been characterized by EPR, optical, IR and Raman spectroscopy. The optical spectrum exhibits a number of electronic bands around 400 nm due to Mn(II) ion in apjohnite. From EPR studies the parameters derived, g = 2.0 and A = 8.82 mT confirm MnO(H2O)5 distorted octahedra. The presence of iron impurity in the mineral is reflected by a broad band centered around 8400 cm-1 in the NIR spectrum. A complex band profile appears strongly both in IR and Raman spectra with four component bands around 1100 cm-1 due to the reduction of symmetry for sulphate ion in the mineral. A strong pair of IR bands at 1681 and 1619 cm-1 with variable intensity is a proof for the presence of water in two states in the structure of apjohnite.

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4 citations in Scopus
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5 citations in Web of Science®

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ID Code: 5452
Item Type: Journal Article
Keywords: Apjohnite, Pseudo, alum, Optical absorption spectrum, EPR, Near, infrared spectroscopy, IR and Raman spectroscopy
DOI: 10.1016/j.saa.2006.01.051
ISSN: 1386-1425
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000)
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
Copyright Owner: Copyright 2006 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 16 Nov 2006
Last Modified: 29 Feb 2012 23:23

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