Co2+-Cu2+ substitution in bieberite solid-solution series, (Co1-xCux)SO4·7H2O, 0.00 ≤ x ≤ 0.46: Synthesis, single-crystal structure analysis, and optical spectroscopy

  title={Co2+-Cu2+ substitution in bieberite solid-solution series, (Co1-xCux)SO4·7H2O, 0.00 ≤ x ≤ 0.46: Synthesis, single-crystal structure analysis, and optical spectroscopy},
  author={G{\"u}nther Josef Redhammer and Lisa Koll and Manfred Bernroider and Gerold Tippelt and Georg A. Roth},
  journal={American Mineralogist},
  pages={532 - 545}
Abstract Single crystals of Cu-substituted bieberite (Co1-xCux)SO4·7 H2O have been synthesized from aqueous solution by the evaporation method. It is shown that the solubility of Cu2+ in bieberite is limited to 0.46 atoms per formula unit (apfu). Chalcantite CuSO4·5H2O only accommodates a very small amount of ~0.03 Co2+ atoms. Structure analysis by X-ray diffraction of single crystals along the join CoSO4·7H2O-CuSO4·5H2O showed that the hepta-hydrate phases are monoclinic with P21/c symmetry at… 
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