Geodesic
Crystal structure and magnetism of $\mathrm{Co}_{2-x}\mathrm{Ni}_x\mathrm{B_2O_5}$ pyroborate
Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 4 (2011) no. 3, pp. 298-307.

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The high quality single crystals of $\mathrm{Co_2B_2O_5}$:$\mathrm{Ni}$ were synthesized. The detail study of crystal structure using single-crystal X-ray diffraction was carried out. The monoclinic symmetry was found ($\mathrm{P2_1/c}$ space group). The magnetization and magnetic susceptibility measurements have shown antiferromagnetic behavior below $T_N=47$ K and paramagnetic temperature $\theta=43$ K. The effective magnetic moment per magnetic ion was $3.49\,\mu_B$, which points out the divalent and high-spin state of $\mathrm{Co}$ and $\mathrm{Ni}$ ions.
Keywords: transition metal borates, solid state reaction, magnetic susceptibility, magnetic frustration. 
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Michael S. Platunov; Natalya B. Ivanova; Natalya V. Kazak; Leonard N. Bezmaternykh; Alexander D. Vasiliev; Evgeny V. Eremin; Sergey G. Ovchinnikov. Crystal structure and magnetism of $\mathrm{Co}_{2-x}\mathrm{Ni}_x\mathrm{B_2O_5}$ pyroborate. Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 4 (2011) no. 3, pp. 298-307. http://geodesic.mathdoc.fr/item/JSFU_2011_4_3_a3/

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