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Crystal structure, spectroscopic, optical, thermal and magnetic studies of new orthoborate Sr2Co(BO3)2

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 ¼ 3.5eV for indirect gap model and Egap ¼ 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.
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https://hal.archives-ouvertes.fr/hal-02504163
Contributor : Nadine Laffargue <>
Submitted on : Tuesday, March 10, 2020 - 3:05:17 PM
Last modification on : Wednesday, March 11, 2020 - 1:47:35 AM

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F.-E. N’faoui, J. Aride, A. Boukhari, M. Taibi, H. Saadaoui, et al.. Crystal structure, spectroscopic, optical, thermal and magnetic studies of new orthoborate Sr2Co(BO3)2. Journal of Solid State Chemistry, Elsevier, 2020, 283, pp.121167. ⟨10.1016/j.jssc.2019.121167⟩. ⟨hal-02504163⟩

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