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

Authors :: Eremina, R. M.
Moshkina, E. M.
Yatsyk, I. V.
Shustov, V. A.
Source :: Bulletin of the Russian Academy of Sciences: Physics; Jul2024, Vol. 88 Issue 7, p1126-1130, 5p
Publication Year :: 2024
Abstract: Results are presented from investigating the structure of Mn<subscript>2.25</subscript>Co<subscript>0.75</subscript>BO<subscript>5</subscript> via powder neutron diffraction. Crystals of ludwigite Mn<subscript>2.25</subscript>Co<subscript>0.75</subscript>BO<subscript>5</subscript> are grown by flux method using a Bi<subscript>2</subscript>Mo<subscript>3</subscript>O<subscript>12</subscript>-based solvent diluted with Na<subscript>2</subscript>CO<subscript>3</subscript> carbonate. Boric acid 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<subscript>2.25</subscript>Co<subscript>0.75</subscript>BO<subscript>5</subscript> 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. [ABSTRACT FROM AUTHOR]