Add time:08/05/2019 Source:sciencedirect.com
The potassium chromium (III) arsenate K3Cr3(AsO4)4 is prepared by solid state reaction at 900°C from a mixture of K2CO3, As2O3 and (NH4)2Cr2O7. It is structurally characterized by single-crystal X-ray diffraction. It crystallizes in the Cmca (no. 64) space group with a=10.671(1) Å, b=20.911(5) Å, c=6.500(3) Å, V=1450.4(8) Å3, Z=4, R(F2)=0.0424 and Rω(F2)=0.1199 for 846 reflections with F2>2σ(F2). The structure consists of CrO6 octahedra and AsO4 tetrahedra sharing corners and edges to form a two-dimensional framework. The K+(2) cations are located in the interlayer space. Conductivity measurement (σ703K=4.61×10−5) shows that K3Cr3(AsO4)4 is a poor ionic conductor.
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