FeTa is Frank-Kasper $\mu$ Phase-like structured and crystallizes in the trigonal R-3m space group. There are seven inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 14-coordinate geometry to one Ta(2), one Ta(3), three equivalent Ta(5), three equivalent Ta(6), and six equivalent Fe(2) atoms. In the second Ta site, Ta(2) is bonded in a 14-coordinate geometry to one Ta(1), one Ta(4), three equivalent Ta(5), three equivalent Ta(6), and six equivalent Fe(1) atoms. In the third Ta site, Ta(3) is bonded in a 16-coordinate geometry to one Ta(1), three equivalent Ta(3), three equivalent Ta(7), and nine equivalent Fe(2) atoms. In the fourth Ta site, Ta(4) is bonded in a 16-coordinate geometry to one Ta(2), three equivalent Ta(4), three equivalent Fe(3), and nine equivalent Fe(1) atoms. In the fifth Ta site, Ta(5) is bonded in a 15-coordinate geometry to three equivalent Ta(1), three equivalent Ta(2), three equivalent Ta(6), three equivalent Fe(1), and three equivalent Fe(2) atoms. In the sixth Ta site, Ta(6) is bonded in a 15-coordinate geometry to three equivalent Ta(1), three equivalent Ta(2), three equivalent Ta(5), three equivalent Fe(1), and three equivalent Fe(2) atoms. In the seventh Ta site, Ta(7) is bonded to six equivalent Ta(3) and six equivalent Fe(2) atoms to form distorted TaTa6Fe6 cuboctahedra that share corners with twelve equivalent Fe(2)Ta8Fe4 cuboctahedra, edges with six equivalent Ta(7)Ta6Fe6 cuboctahedra, and faces with eighteen equivalent Fe(2)Ta8Fe4 cuboctahedra. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one Ta(5), one Ta(6), two equivalent Ta(2), three equivalent Ta(4), one Fe(3), and four equivalent Fe(1) atoms to form FeTa7Fe5 cuboctahedra that share corners with two equivalent Fe(3)Ta6Fe6 cuboctahedra, corners with four equivalent Fe(2)Ta8Fe4 cuboctahedra, corners with nine equivalent Fe(1)Ta7Fe5 cuboctahedra,  an edgeedge with one Fe(2)Ta8Fe4 cuboctahedra, edges with four equivalent Fe(1)Ta7Fe5 cuboctahedra, faces with three equivalent Fe(3)Ta6Fe6 cuboctahedra, and faces with ten equivalent Fe(1)Ta7Fe5 cuboctahedra. In the second Fe site, Fe(2) is bonded to one Ta(5), one Ta(6), one Ta(7), two equivalent Ta(1), three equivalent Ta(3), and four equivalent Fe(2) atoms to form distorted FeTa8Fe4 cuboctahedra that share corners with two equivalent Ta(7)Ta6Fe6 cuboctahedra, corners with four equivalent Fe(1)Ta7Fe5 cuboctahedra, corners with nine equivalent Fe(2)Ta8Fe4 cuboctahedra,  an edgeedge with one Fe(1)Ta7Fe5 cuboctahedra, edges with four equivalent Fe(2)Ta8Fe4 cuboctahedra, faces with three equivalent Ta(7)Ta6Fe6 cuboctahedra, and faces with ten equivalent Fe(2)Ta8Fe4 cuboctahedra. In the third Fe site, Fe(3) is bonded to six equivalent Ta(4) and six equivalent Fe(1) atoms to form FeTa6Fe6 cuboctahedra that share corners with twelve equivalent Fe(1)Ta7Fe5 cuboctahedra, edges with six equivalent Fe(3)Ta6Fe6 cuboctahedra, and faces with eighteen equivalent Fe(1)Ta7Fe5 cuboctahedra.
FeTa is Frank-Kasper $\mu$ Phase-like structured and crystallizes in the trigonal R-3m space group. There are seven inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 14-coordinate geometry to one Ta(2), one Ta(3), three equivalent Ta(5), three equivalent Ta(6), and six equivalent Fe(2) atoms. The Ta(1)-Ta(2) bond length is 2.62 Å. The Ta(1)-Ta(3) bond length is 2.82 Å. All Ta(1)-Ta(5) bond lengths are 3.09 Å. All Ta(1)-Ta(6) bond lengths are 3.09 Å. All Ta(1)-Fe(2) bond lengths are 2.66 Å. In the second Ta site, Ta(2) is bonded in a 14-coordinate geometry to one Ta(1), one Ta(4), three equivalent Ta(5), three equivalent Ta(6), and six equivalent Fe(1) atoms. The Ta(2)-Ta(4) bond length is 2.76 Å. All Ta(2)-Ta(5) bond lengths are 3.09 Å. All Ta(2)-Ta(6) bond lengths are 3.09 Å. All Ta(2)-Fe(1) bond lengths are 2.67 Å. In the third Ta site, Ta(3) is bonded in a 16-coordinate geometry to one Ta(1), three equivalent Ta(3), three equivalent Ta(7), and nine equivalent Fe(2) atoms. All Ta(3)-Ta(3) bond lengths are 2.91 Å. All Ta(3)-Ta(7) bond lengths are 2.83 Å. There are three shorter (2.85 Å) and six longer (2.97 Å) Ta(3)-Fe(2) bond lengths. In the fourth Ta site, Ta(4) is bonded in a 16-coordinate geometry to one Ta(2), three equivalent Ta(4), three equivalent Fe(3), and nine equivalent Fe(1) atoms. All Ta(4)-Ta(4) bond lengths are 2.89 Å. All Ta(4)-Fe(3) bond lengths are 2.82 Å. There are three shorter (2.73 Å) and six longer (2.92 Å) Ta(4)-Fe(1) bond lengths. In the fifth Ta site, Ta(5) is bonded in a 15-coordinate geometry to three equivalent Ta(1), three equivalent Ta(2), three equivalent Ta(6), three equivalent Fe(1), and three equivalent Fe(2) atoms. All Ta(5)-Ta(6) bond lengths are 2.80 Å. All Ta(5)-Fe(1) bond lengths are 2.80 Å. All Ta(5)-Fe(2) bond lengths are 2.81 Å. In the sixth Ta site, Ta(6) is bonded in a 15-coordinate geometry to three equivalent Ta(1), three equivalent Ta(2), three equivalent Ta(5), three equivalent Fe(1), and three equivalent Fe(2) atoms. All Ta(6)-Fe(1) bond lengths are 2.81 Å. All Ta(6)-Fe(2) bond lengths are 2.78 Å. In the seventh Ta site, Ta(7) is bonded to six equivalent Ta(3) and six equivalent Fe(2) atoms to form distorted TaTa6Fe6 cuboctahedra that share corners with twelve equivalent Fe(2)Ta8Fe4 cuboctahedra, edges with six equivalent Ta(7)Ta6Fe6 cuboctahedra, and faces with eighteen equivalent Fe(2)Ta8Fe4 cuboctahedra. All Ta(7)-Fe(2) bond lengths are 2.55 Å. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one Ta(5), one Ta(6), two equivalent Ta(2), three equivalent Ta(4), one Fe(3), and four equivalent Fe(1) atoms to form FeTa7Fe5 cuboctahedra that share corners with two equivalent Fe(3)Ta6Fe6 cuboctahedra, corners with four equivalent Fe(2)Ta8Fe4 cuboctahedra, corners with nine equivalent Fe(1)Ta7Fe5 cuboctahedra,  an edgeedge with one Fe(2)Ta8Fe4 cuboctahedra, edges with four equivalent Fe(1)Ta7Fe5 cuboctahedra, faces with three equivalent Fe(3)Ta6Fe6 cuboctahedra, and faces with ten equivalent Fe(1)Ta7Fe5 cuboctahedra. The Fe(1)-Fe(3) bond length is 2.43 Å. There are two shorter (2.42 Å) and two longer (2.43 Å) Fe(1)-Fe(1) bond lengths. In the second Fe site, Fe(2) is bonded to one Ta(5), one Ta(6), one Ta(7), two equivalent Ta(1), three equivalent Ta(3), and four equivalent Fe(2) atoms to form distorted FeTa8Fe4 cuboctahedra that share corners with two equivalent Ta(7)Ta6Fe6 cuboctahedra, corners with four equivalent Fe(1)Ta7Fe5 cuboctahedra, corners with nine equivalent Fe(2)Ta8Fe4 cuboctahedra,  an edgeedge with one Fe(1)Ta7Fe5 cuboctahedra, edges with four equivalent Fe(2)Ta8Fe4 cuboctahedra, faces with three equivalent Ta(7)Ta6Fe6 cuboctahedra, and faces with ten equivalent Fe(2)Ta8Fe4 cuboctahedra. There are two shorter (2.37 Å) and two longer (2.48 Å) Fe(2)-Fe(2) bond lengths. In the third Fe site, Fe(3) is bonded to six equivalent Ta(4) and six equivalent Fe(1) atoms to form FeTa6Fe6 cuboctahedra that share corners with twelve equivalent Fe(1)Ta7Fe5 cuboctahedra, edges with six equivalent Fe(3)Ta6Fe6 cuboctahedra, and faces with eighteen equivalent Fe(1)Ta7Fe5 cuboctahedra.