Open AccessOptical absorption, infrared, Raman, and EPR spectral studies on natural iowaite mineral
Author(s) -
S. Lakshmi Reddy,
K. Sesha Maheswaramma,
G. Siva Reddy,
B. J. Reddy,
Tamio Endo,
Ray L. Frost
Publication year - 2010
Publication title -
transition metal chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.251
H-Index - 56
eISSN - 1572-901X
pISSN - 0340-4285
DOI - 10.1007/s11243-010-9331-8
Subject(s) - electron paramagnetic resonance , raman spectroscopy , chemistry , absorption (acoustics) , infrared , analytical chemistry (journal) , infrared spectroscopy , ion , mineral , ferric , absorption spectroscopy , spectroscopy , inorganic chemistry , nuclear magnetic resonance , materials science , optics , physics , organic chemistry , quantum mechanics , composite material , chromatography
Natural iowaite, magnesium–ferric oxychloride mineral having light green color originating from Australia has been characterized by EPR, optical, IR, and Raman spectroscopy. The optical spectrum exhibits a number of electronic bands due to both Fe(III) and Mn(II) ions in iowaite. From EPR studies, the g values are calculated for Fe(III) and g and A values for Mn(II). EPR and optical absorption studies confirm that Fe(III) and Mn(II) are in distorted octahedral geometry. The bands that appear both in NIR and Raman spectra are due to the overtones and combinations of water and carbonate molecules. Thus EPR, optical, and Raman spectroscopy have proven most useful for the study of the chemistry of natural iowaite and chemical changes in the mineral
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