Materials Data on U2Mn3Si by Materials Project
U2Mn3Si crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. U is bonded in a 12-coordinate geometry to four equivalent U, nine equivalent Mn, and three equivalent Si atoms. There are one shorter (2.72 Å) and three longer (3.20 Å) U–U bond lengths. There are six shorter (2.91 Å) and three longer (2.92 Å) U–Mn bond lengths. All U–Si bond lengths are 3.03 Å. Mn is bonded to six equivalent U, four equivalent Mn, and two equivalent Si atoms to form distorted MnU6Mn4Si2 cuboctahedra that share corners with four equivalent SiU6Mn6 cuboctahedra, corners with fourteen equivalent MnU6Mn4Si2 cuboctahedra, edges with six equivalent MnU6Mn4Si2 cuboctahedra, faces with six equivalent SiU6Mn6 cuboctahedra, and faces with twelve equivalent MnU6Mn4Si2 cuboctahedra. There are two shorter (2.54 Å) and two longer (2.61 Å) Mn–Mn bond lengths. Both Mn–Si bond lengths are 2.46 Å. Si is bonded to six equivalent U and six equivalent Mn atoms to form distorted SiU6Mn6 cuboctahedra that share corners with twelve equivalent MnU6Mn4Si2 cuboctahedra, edges with six equivalent SiU6Mn6 cuboctahedra, faces with two equivalent SiU6Mn6 cuboctahedra, and faces with eighteen equivalent MnU6Mn4Si2 cuboctahedra.