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Crystal Research and Technology |
Cryst. Res. Technol. 41, 818 (2006) - Abstract -
Optical absorption and EPR spectral studies of vauquelinite
K. Nagamuni Reddy, G. Siva Reddy, S. Lakshmi Reddy*, and P. S. Rao**
Dept. of Chemistry, S.V.U.P.G.Centre, Kadapa 516 003, India
*Dept. of Physics, S.V.D.College, Kadapa 516 003, India
**Dept. of Chemistry, Pondicherrry University, Pondicherry, India
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.
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