Crystal structure and magnetic properties of K2CoV2O7

• We synthesized the new material K2CoV2O7 using solid state reaction route.
• We solved its crystal structure using X-ray powder diffraction data.
• We carried out magnetic susceptibility measurements.
• The magnetic susceptibility follows the Curie law χ = C/ T.

The new compound K2CoV2O7 has been synthesized by a solid state reaction route. Its crystal structure has been determined using powder X-ray diffraction data (PXRD). The compound K2CoV2O7 crystallizes with the melilite-type structure with the tetragonal unit cell parameters a = 8.4574(1), c = 5.5729(1) Å and the space group P4−21m. The structure consists of [CoV2O7]2− layers perpendicular to the c axis separated by K+ layers. The [CoV2O7]2− layers consist of corner-sharing CoO4 tetrahedra and V2O7 pyrovanadate units, the linkage of these tetrahedra forming five-membered rings. The K+ cations occupy distorted square antiprisms of oxygen atoms. The magnetic susceptibility of K2CoV2O7 follows the Curie law χT = C with an effective magnetic moment μeff = 4.71 μB.

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