Synthesis and Characterization of the New Copper Indium Phosphate Cu8In8P4O30

The system CuO/In2O3/P2O5 has been investigated using solid state reaction between CuO, In2O3 and (NH4)(2)HPO4 in silica glass crucibles at 900 degrees C. The powder samples were characterized by X-ray diffraction, thermal analysis and FT-IR spectroscopy. Orange single crystals of the new quaternary phase were achieved by the process of crystallization with mineralizers in sealed silica glass ampoules. They were then analyzed with EDX and single-crystal X-ray analysis in which the composition Cu8In8P4O30 with the triclinic space group P (1) over bar (No 2) with a = 7,2429(14) angstrom, b = 8,8002(18) angstrom, c = 10,069(2) angstrom, = 103,62(3)degrees, = 106,31(3)degrees, = 101,55(3)degrees and Z = 1 was found. The three-dimensional framework consists of [InO6] octahedra and distorted [CuO6] octahedra, overcaped [InO7] prisms and [PO4] tetrahedra, also trigonal [(CuIn)O-5] bipyramids and distorted [(CuIn)O-6] octahedra, where copper and indium are partly exchanged against each other. Cu8In8P4O30 exhibits an incongruent melting point at 1023 degrees C.

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