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A new arsenate K 1+2 x  Ni 1- x  Fe 2 (AsO 4 ) 3 ( x = 1/8) {potassium nickel diiron(III) tris-[arsenate(V)]} was synthesized using a flux method and its crystal structure was determined from single-crystal X-ray diffraction data. This material was also characterized by qualitative energy dispersive X-ray spectroscopy (EDS) analysis. The crystal structure belongs to the α-CrPO 4 -structure type, space group Imma . It consists of a three-dimensional-framework built up from FeO 6 and Ni 0.875 □ 1.25 O 6 -octa-hedra and AsO 4 -tetra-hedra that are sharing corners and/or edges, generating tunnels running along the [010] and [001] directions in which the potassium cations are located. The proposed structural model was validated by bond-valence-sum calculations, charge-distribution (CHARDI) and Madelung energy analyses.

acta crystallographica. section e, crystallographic communications

K1+2xNi1−xFe2(AsO4)3(x= 0,125): un nouvel arséniate à structure de type α-CrPO4