Synthesis and crystal structure CoNi2(BO3)(2)

A new metal orthoborate compound, cobalt dinickel orthoborate, CoNi2(BO3)(2) has been successfully synthesized for the first time. The title compound was synthesized by thermally-induced solid-state chemical reaction at 900A degrees C between the initial reagents of Co(NO3)(2) center dot 6H(2)O, Ni(NO3)(2) center dot 6H(2)O and H3BO3 which were mixed with the mol ratio of 1: 2: 2 respectively. The obtained product was structurally characterized by X-ray powder diffraction technique. It has been found that the CoNi2(BO3)(2) crystallizes in the kotoite type and isostructural with the compounds having the chemical formula M-3(BO3)(2) where M-Mg, Co and Ni. The synthesized compound belongs to the orthorhombic crystal system with the refined unit cell parameters of a = 5.419(9) A..., b = 8.352(0) A..., c = 4.478(8) A... and Z = 2. The space group was determined as Pnmn. Further characterizations by FTIR, elemental analysis and thermal analysis were also performed.