Abstract
Single crystals of the solid solution cobalt manganese tetrakis(hydrogen phosphate) bis(phosphate), Co4.32Mn2.68(HPO4)4(PO4)2, have been prepared under hydrothermal conditions. The compound crystallizes in the Fe7(PO4)6 structure type and is isotypic with the Co and Mn end members of the solid solution Co7−xMnx(HPO4)4(PO4)2. The structure is based on a three-dimensional framework of distorted edge-sharing MO6 and MO5 polyhedra (M = Co or Mn) which are interlinked by corner-sharing with PO4 tetrahedra. The four metal positions are statistically occupied by Co and Mn. Strong hydrogen bonds between the OH groups of the HPO4 tetrahedra and the O atoms help to consolidate the crystal structure. Except for one metal site located on a position with \overline{1} symmetry, all atoms are on general positions.
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