Cobalt Borate Phosphate, Co3[BPO7], Synthesis and Characterization

Single crystals of Co3[BPO7] were obtained by boron flux method and characterized by single-crystal diffraction data. The compound crystallizes in the monoclinic space group Cm with a=9.774(2), b=12.688(2), c=4.9057(8) ?, =119.749(2)°; V=528.20(15) ?3; Z=4. The structure consists of Co in trigonal bipyramids, square pyramids, and distorted octahedra. Polyhedral Co centers, triangular B centers, and tetrahedral P centers are joined together to form a three-dimensional network. The temperature dependence of the magnetic susceptibility of the compound follows the Curie–Weiss law to 30 K. Below this temperature, the magnetic behavior displayed first antiferromagnetic ordering followed by ferrimagnetic coupling at 25 K.