The Sc-Mn-B system

XRD has been applied to the component interactions in the Sc - Mn - B system and to construct an isothermal section. The ternary boride Sc2.28Mn0. 72B6 has been obtained. The single-crystal method shows that the boride structure belongs to the Y2ReB6 structural type: space group Pbam, a = = 0.87810(5) nm, b = 1.10641(6) nm, c = 0.33674(I) nm, 2thetamax = 24.27 deg , Nhkl = 1020, and RF = 0.0391. A feature of the new boride is the random distribution of the Sc and Mn atoms in positions with the smaller coordination number in the compound structure. Component interaction has been examined in the systems Sc -M -B, where Mis a transition metal.