Bulletin of Materials Science

, Volume 19, Issue 6, pp 1089–1094 | Cite as

EPMA, EPR, electronic and vibrational spectral studies on natural aurichalcite

  • S Vedanand
  • B Madhu Sudhana
  • B J Reddy
  • P Sambasiva Rao
Papers Presented At The Materials Science Section Of The 82nd Indian Science Congress, Calcutta, 1995


The electron probe micro analysis (EPMA), electron paramagnetic resonance (EPR), electronic and vibrational spectral studies on a natural mineral, aurichalcite were studied at room temperature. The EPMA analysis revealed the concentration of copper in the mineral to be 2·6 wt% and zinc as 24·5 wt%. The optical spectra revealed the presence of copper inD 4h symmetry with crystal field (Dq) and tetragonal field (Ds andDt) parameters as 1250, 1600 and 520 cm−1 respectively. This further confirmed the presence of Cu(II) ion in an elongated tetragonal site. The EPR studies indicated the presence of Cu(II) ion, but hyperfine lines could not be resolved due to the high concentration of the paramagnetic impurity in the mineral. The IR spectrum confirmed the presence of water and carbonate ion.


Aurichalcite optical absorption spectra EPR Cu(II) ion 


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Copyright information

© the Indian Academy of Sciences 1996

Authors and Affiliations

  • S Vedanand
    • 1
  • B Madhu Sudhana
    • 1
  • B J Reddy
    • 1
  • P Sambasiva Rao
    • 1
    • 2
  1. 1.Department of PhysicsS V UniversityTirupatiIndia
  2. 2.Department of ChemistryPondicherry UniversityPondicherryIndia

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