Crystal Structure and EPR Spectra of Mn2.25Co0.75BO5

Eremina, R.M., Moshkina, E.M., Yatsyk, I.V., Shustov, V.A.// Bulletin of the Russian Academy of Sciences: Physics//

https://doi.org/10.1134/S1062873824707190

Results are presented from investigating the structure of Mn_2.25Co_0.75BO₅ via powder neutron diffraction. Crystals of ludwigite Mn_2.25Co_0.75BO₅ are grown by flux method using a Bi₂Mo₃O₁₂-based solvent diluted with Na₂CO₃ carbonate. Boric acid $H_{3}^{11} B O_{3}$ is used as the boron-containing reagent. Powder neutron diffraction measurements are made at a temperature of 100 K on powder prepared by grinding grown single crystals. Rietveld studies show that the grown Mn_2.25Co_0.75BO₅ crystals belong to Pbam space group. Crystallographic sites occupied by cobalt and manganese ions are identified by analyzing powder neutron diffractograms. A bottleneck regime is observed in the temperature dependence of the EPR spectra.