YFeMn crystallizes in the orthorhombic Imma space group. Y(1) is bonded in a 16-coordinate geometry to four equivalent Y(1), six equivalent Mn(1), and six equivalent Fe(1) atoms. Mn(1) is bonded to six equivalent Y(1), two equivalent Mn(1), and four equivalent Fe(1) atoms to form MnY6Mn2Fe4 cuboctahedra that share corners with eight equivalent Fe(1)Y6Mn4Fe2 cuboctahedra, corners with ten equivalent Mn(1)Y6Mn2Fe4 cuboctahedra, edges with six equivalent Mn(1)Y6Mn2Fe4 cuboctahedra, faces with six equivalent Mn(1)Y6Mn2Fe4 cuboctahedra, and faces with twelve equivalent Fe(1)Y6Mn4Fe2 cuboctahedra. Fe(1) is bonded to six equivalent Y(1), four equivalent Mn(1), and two equivalent Fe(1) atoms to form FeY6Mn4Fe2 cuboctahedra that share corners with eight equivalent Mn(1)Y6Mn2Fe4 cuboctahedra, corners with ten equivalent Fe(1)Y6Mn4Fe2 cuboctahedra, edges with six equivalent Fe(1)Y6Mn4Fe2 cuboctahedra, faces with six equivalent Fe(1)Y6Mn4Fe2 cuboctahedra, and faces with twelve equivalent Mn(1)Y6Mn2Fe4 cuboctahedra.
YFeMn crystallizes in the orthorhombic Imma space group. Y(1) is bonded in a 16-coordinate geometry to four equivalent Y(1), six equivalent Mn(1), and six equivalent Fe(1) atoms. There are two shorter (3.15 Å) and two longer (3.16 Å) Y(1)-Y(1) bond lengths. There are four shorter (3.00 Å) and two longer (3.04 Å) Y(1)-Mn(1) bond lengths. There are two shorter (3.00 Å) and four longer (3.04 Å) Y(1)-Fe(1) bond lengths. Mn(1) is bonded to six equivalent Y(1), two equivalent Mn(1), and four equivalent Fe(1) atoms to form MnY6Mn2Fe4 cuboctahedra that share corners with eight equivalent Fe(1)Y6Mn4Fe2 cuboctahedra, corners with ten equivalent Mn(1)Y6Mn2Fe4 cuboctahedra, edges with six equivalent Mn(1)Y6Mn2Fe4 cuboctahedra, faces with six equivalent Mn(1)Y6Mn2Fe4 cuboctahedra, and faces with twelve equivalent Fe(1)Y6Mn4Fe2 cuboctahedra. Both Mn(1)-Mn(1) bond lengths are 2.61 Å. All Mn(1)-Fe(1) bond lengths are 2.58 Å. Fe(1) is bonded to six equivalent Y(1), four equivalent Mn(1), and two equivalent Fe(1) atoms to form FeY6Mn4Fe2 cuboctahedra that share corners with eight equivalent Mn(1)Y6Mn2Fe4 cuboctahedra, corners with ten equivalent Fe(1)Y6Mn4Fe2 cuboctahedra, edges with six equivalent Fe(1)Y6Mn4Fe2 cuboctahedra, faces with six equivalent Fe(1)Y6Mn4Fe2 cuboctahedra, and faces with twelve equivalent Mn(1)Y6Mn2Fe4 cuboctahedra. Both Fe(1)-Fe(1) bond lengths are 2.55 Å.