Synthesis and Characterization of the New Copper Indium Phosphate Cu8In8P4O30 |
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Authors: | Christian Hanzelmann Iren Weimann Jörg Feller Zdirad Žak |
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Affiliation: | 1. Hochschule für Technik und Wirtschaft Dresden, Friedrich‐List‐Platz 1, 01069 Dresden, Germany;2. Masaryk University, Kotlá?ská 267/2, 61137 Brno, Czech Republic |
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Abstract: | The system CuO/In2O3/P2O5 has been investigated using solid state reaction between CuO, In2O3 and (NH4)2HPO4 in silica glass crucibles at 900 °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$bar{1}$ (No 2) with a = 7,2429(14) Å, b = 8,8002(18) Å, c = 10,069(2) Å, α = 103,62(3)°, β = 106,31(3)°, γ = 101,55(3)° 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)O5] bipyramids and distorted [(CuIn)O6] octahedra, where copper and indium are partly exchanged against each other. Cu8In8P4O30 exhibits an incongruent melting point at 1023 °C. |
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Keywords: | Copper Indium Phosphate Single‐crystal structure Phase diagrams Solid state reaction Thermal analysis |
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