Ta7Fe6 is Frank-Kasper $\mu$ Phase-like structured and crystallizes in the trigonal R-3m space group. There are four inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to six equivalent Ta(3) and six equivalent Fe(1) atoms to form distorted TaTa6Fe6 cuboctahedra that share corners with twelve equivalent Fe(1)Ta8Fe4 cuboctahedra, edges with six equivalent Ta(1)Ta6Fe6 cuboctahedra, and faces with eighteen equivalent Fe(1)Ta8Fe4 cuboctahedra. In the second Ta site, Ta(2) is bonded in a 15-coordinate geometry to three equivalent Ta(2), six equivalent Ta(4), and six equivalent Fe(1) atoms. In the third Ta site, Ta(3) is bonded in a 16-coordinate geometry to one Ta(4), three equivalent Ta(1), three equivalent Ta(3), and nine equivalent Fe(1) atoms. In the fourth Ta site, Ta(4) is bonded in a 14-coordinate geometry to one Ta(3), one Ta(4), six equivalent Ta(2), and six equivalent Fe(1) atoms. Fe(1) is bonded to one Ta(1), two equivalent Ta(2), two equivalent Ta(4), three equivalent Ta(3), and four equivalent Fe(1) atoms to form distorted FeTa8Fe4 cuboctahedra that share corners with two equivalent Ta(1)Ta6Fe6 cuboctahedra, corners with thirteen equivalent Fe(1)Ta8Fe4 cuboctahedra, edges with five equivalent Fe(1)Ta8Fe4 cuboctahedra, faces with three equivalent Ta(1)Ta6Fe6 cuboctahedra, and faces with ten equivalent Fe(1)Ta8Fe4 cuboctahedra.
Ta7Fe6 is Frank-Kasper $\mu$ Phase-like structured and crystallizes in the trigonal R-3m space group. There are four inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to six equivalent Ta(3) and six equivalent Fe(1) atoms to form distorted TaTa6Fe6 cuboctahedra that share corners with twelve equivalent Fe(1)Ta8Fe4 cuboctahedra, edges with six equivalent Ta(1)Ta6Fe6 cuboctahedra, and faces with eighteen equivalent Fe(1)Ta8Fe4 cuboctahedra. All Ta(1)-Ta(3) bond lengths are 2.88 Å. All Ta(1)-Fe(1) bond lengths are 2.56 Å. In the second Ta site, Ta(2) is bonded in a 15-coordinate geometry to three equivalent Ta(2), six equivalent Ta(4), and six equivalent Fe(1) atoms. All Ta(2)-Ta(2) bond lengths are 2.85 Å. There are three shorter (3.14 Å) and three longer (3.15 Å) Ta(2)-Ta(4) bond lengths. There are three shorter (2.77 Å) and three longer (2.81 Å) Ta(2)-Fe(1) bond lengths. In the third Ta site, Ta(3) is bonded in a 16-coordinate geometry to one Ta(4), three equivalent Ta(1), three equivalent Ta(3), and nine equivalent Fe(1) atoms. The Ta(3)-Ta(4) bond length is 2.80 Å. All Ta(3)-Ta(3) bond lengths are 2.95 Å. There are three shorter (2.86 Å) and six longer (3.01 Å) Ta(3)-Fe(1) bond lengths. In the fourth Ta site, Ta(4) is bonded in a 14-coordinate geometry to one Ta(3), one Ta(4), six equivalent Ta(2), and six equivalent Fe(1) atoms. The Ta(4)-Ta(4) bond length is 2.66 Å. All Ta(4)-Fe(1) bond lengths are 2.69 Å. Fe(1) is bonded to one Ta(1), two equivalent Ta(2), two equivalent Ta(4), three equivalent Ta(3), and four equivalent Fe(1) atoms to form distorted FeTa8Fe4 cuboctahedra that share corners with two equivalent Ta(1)Ta6Fe6 cuboctahedra, corners with thirteen equivalent Fe(1)Ta8Fe4 cuboctahedra, edges with five equivalent Fe(1)Ta8Fe4 cuboctahedra, faces with three equivalent Ta(1)Ta6Fe6 cuboctahedra, and faces with ten equivalent Fe(1)Ta8Fe4 cuboctahedra. There are two shorter (2.42 Å) and two longer (2.52 Å) Fe(1)-Fe(1) bond lengths.