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Optical absorption and EPR spectral studies of vauquelinite
Author(s) -
Reddy K. Nagamuni,
Reddy G. Siva,
Reddy S. Lakshmi,
Rao P. S.
Publication year - 2006
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200510676
Subject(s) - electron paramagnetic resonance , impurity , octahedron , chemistry , absorption (acoustics) , absorption spectroscopy , mineral , crystallography , analytical chemistry (journal) , materials science , crystal structure , nuclear magnetic resonance , optics , physics , organic chemistry , chromatography , composite material
Abstract Vauquelinite ‐ a mineral ‐ was investigated by EPR, NIR and optical spectroscopic techniques. EPR studies on powder sample confirm the presence of Cu(II) and Fe(III) impurity in the mineral. Optical absorption spectrum also indicates that Cu(II) impurity is present in rhombically distorted octahedral structure and Fe(III) in octahedral structure. NIR results are due to water fundamentals and phosphate combination tone. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)