Abstract
Two isostructural compounds Ca3M3(PO4)4 (M = Co, Ni) were synthesized by conventional high-temperature solid-state reaction. The structure of the titled compounds crystallizes in the monoclinic system with space group C2/c. The magnetic M2+ ions exhibit three different oxygen-coordinated environments such as tetrahedron, pyramid, and octahedron. The unique linkages of magnetic polyhedra lead to an interesting wave-like network in the a-b plane, showing the V-like clusters inserted alternatively between the zigzag chains. Magnetic measurements suggest that isostructural compounds Ca3M3(PO4)4 exhibit different magnetic properties, in which Ca3Ni3(PO4)4 possesses an antiferromagnetic ordering at 17 K while Ca3Co3(PO4)4 shows paramagnetic behavior down to 2 K.
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