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Abstract
The potassium chromium (III) phosphate K3Cr3(PO4)4 is prepared by a solid state reaction at 1173 K from a mixture of K2CO3, NH4H2PO4, and (NH4)Cr2O7. It is structurally characterized by single-crystal X-ray diffraction. It crystallizes in the Cmca (n°64) space group with a = 10.524(4) Åi, b = 20.466(6) Åi, c = 6.374(2) Åi, V = 1372.9(8) Åi3, Z = 4, R(F2) = 0.0452, and R W (F2) = 0.1184 for 790 reflections with I > 2σ(I). The structure consists of CrO6 octahedra and PO4 tetrahedra sharing corners and edges to form a two-dimensional framework. The K+ cations are located in the interlayer space. Conductivity measurement leads to σ = 47.32 10−5 Ω−1 m−1 at 729 K. K3Cr3(PO4)4 is a better ionic conductor than K3Cr3(AsO4)4 at the same temperature.