Optical spectroscopic study of tetrahedrally coordinated Co2+ in natural spinel and staurolite at different temperatures and pressures

@article{Taran2009OpticalSS,
  title={Optical spectroscopic study of tetrahedrally coordinated Co2+ in natural spinel and staurolite at different temperatures and pressures},
  author={Michail N. Taran and Monika Koch-M{\"u}ller and Anne Avlund Feenstra},
  journal={American Mineralogist},
  year={2009},
  volume={94},
  pages={1647 - 1652}
}
Abstract Optical absorption spectra of natural Co-bearing spinel and staurolite were studied at different temperatures and pressures. In both minerals, two broad, intense structured bands in the range 5500-8000 and 15 000-19 000 cm-1, caused by electronic spin-allowed transitions 4A2 → 4T1(4F) and 4A2 → 4T1(4P) of IVCo2+ are the predominant absorption features. In addition, in both cases broad bands, derived from spin-allowed electronic transitions 4E → 4T2 of IVFe2+, appear in the near… CONTINUE READING

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