Co5/3Nb1/3BO4: A new cobalt oxyborate with a complex magnetic structure

Temperature- and Field-Induced Transformation of the Magnetic State in Co2.5Ge0.5BO5

“…Strong magnetic anisotropy is observed even in the paramagnetic phase (Figure ). We performed the analysis of the magnetic susceptibility using an approach, which was earlier applied to other Co-containing borates: Co 3 BO 5 , Co 5/3 Nb 1/3 BO 4 , and Co 2 B 2 O 5 . The magnetic susceptibilities along the three directions as well as an average susceptibility obey the modified Curie–Weiss law in the T range 150–300 K where χ 0 is the temperature-independent term, C is the Curie–Weiss constant, and θ is the Curie–Weiss temperature.…”

Anisotropic thermal expansion and electronic transitions in the Co3BO5 ludwigite

“…The tendency of layer-by-layer charge ordering is well illustrated by the example of the Mn–Mg–B–O system, within which the structural series of warwickite–orthopinakiolite–hulsite–ludwigite has been successfully synthesized. 38 With the increase of the Mg concentration, the tendency for substitutional atoms to form (MgO 6 ) ∞ layers is clearly seen, while trivalent manganese ions fill sites in the voids between these layers, like the boron atoms.…”