Fe7W6 is Frank-Kasper $\mu$ Phase structured and crystallizes in the trigonal R-3m space group. There are three inequivalent W sites. In the first W site, W(1) is bonded in a 6-coordinate geometry to six equivalent Fe(2) atoms. In the second W site, W(2) is bonded in a 16-coordinate geometry to one W(3), three equivalent W(2), three equivalent Fe(1), and nine equivalent Fe(2) atoms. In the third W site, W(3) is bonded in a 6-coordinate geometry to one W(2) and six equivalent Fe(2) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to six equivalent W(2) and six equivalent Fe(2) atoms to form FeFe6W6 cuboctahedra that share corners with twelve equivalent Fe(2)Fe5W7 cuboctahedra, edges with six equivalent Fe(1)Fe6W6 cuboctahedra, and faces with eighteen equivalent Fe(2)Fe5W7 cuboctahedra. In the second Fe site, Fe(2) is bonded to two equivalent W(1), two equivalent W(3), three equivalent W(2), one Fe(1), and four equivalent Fe(2) atoms to form FeFe5W7 cuboctahedra that share corners with two equivalent Fe(1)Fe6W6 cuboctahedra, corners with thirteen equivalent Fe(2)Fe5W7 cuboctahedra, edges with five equivalent Fe(2)Fe5W7 cuboctahedra, faces with three equivalent Fe(1)Fe6W6 cuboctahedra, and faces with ten equivalent Fe(2)Fe5W7 cuboctahedra.
Fe7W6 is Frank-Kasper $\mu$ Phase structured and crystallizes in the trigonal R-3m space group. There are three inequivalent W sites. In the first W site, W(1) is bonded in a 6-coordinate geometry to six equivalent Fe(2) atoms. There are three shorter (2.71 Å) and three longer (2.73 Å) W(1)-Fe(2) bond lengths. In the second W site, W(2) is bonded in a 16-coordinate geometry to one W(3), three equivalent W(2), three equivalent Fe(1), and nine equivalent Fe(2) atoms. The W(2)-W(3) bond length is 2.67 Å. All W(2)-W(2) bond lengths are 2.85 Å. All W(2)-Fe(1) bond lengths are 2.78 Å. There are three shorter (2.72 Å) and six longer (2.88 Å) W(2)-Fe(2) bond lengths. In the third W site, W(3) is bonded in a 6-coordinate geometry to one W(2) and six equivalent Fe(2) atoms. All W(3)-Fe(2) bond lengths are 2.61 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to six equivalent W(2) and six equivalent Fe(2) atoms to form FeFe6W6 cuboctahedra that share corners with twelve equivalent Fe(2)Fe5W7 cuboctahedra, edges with six equivalent Fe(1)Fe6W6 cuboctahedra, and faces with eighteen equivalent Fe(2)Fe5W7 cuboctahedra. All Fe(1)-Fe(2) bond lengths are 2.42 Å. In the second Fe site, Fe(2) is bonded to two equivalent W(1), two equivalent W(3), three equivalent W(2), one Fe(1), and four equivalent Fe(2) atoms to form FeFe5W7 cuboctahedra that share corners with two equivalent Fe(1)Fe6W6 cuboctahedra, corners with thirteen equivalent Fe(2)Fe5W7 cuboctahedra, edges with five equivalent Fe(2)Fe5W7 cuboctahedra, faces with three equivalent Fe(1)Fe6W6 cuboctahedra, and faces with ten equivalent Fe(2)Fe5W7 cuboctahedra. There are two shorter (2.38 Å) and two longer (2.39 Å) Fe(2)-Fe(2) bond lengths.