LAUSR

Abstract Single crystals of a novel distrontium cobalt diborate, Sr2Co(BO3)2, were successfully obtained from the melt at 1200 ​°C of the polycrystalline material. The powder of Sr2Co(BO3)2 compound was synthesized using standard solid state reaction at 850 ​°C. The refinement of the structure shows that Sr2Co(BO3)2 crystallizes in the monoclinic cell with the space group C2/m. The crystal structure is built from [CoO6] octahedra linked to [BO3] triangles by the vertices and to the SrO9 polyhedra by sharing two faces. The infrared analysis confirms the existence of BO3 vibrations group’s. The calculated gap energy is Egap ​= ​3.5eV for indirect gap model and Egap ​= ​3.75eV for direct gap one. The magnetic measurements show that antiferromagnetic interactions are predominant in the studied borate. The high temperature X-ray diffraction and the differential scanning calorimetry allow to observe two anomalies in the temperature range of 400–800 ​°C which correspond to the phase transitions of Sr2Co(BO3)2.