Nd6Ga3Fe11 crystallizes in the tetragonal I4cm space group. There are four inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 6-coordinate geometry to one Fe(1), three equivalent Fe(5), and two equivalent Ga(1) atoms. In the second Nd site, Nd(2) is bonded in a 6-coordinate geometry to one Fe(2), two equivalent Ga(1), and three equivalent Ga(2) atoms. In the third Nd site, Nd(3) is bonded in a 13-coordinate geometry to four equivalent Fe(2), four equivalent Fe(3), one Ga(1), and four equivalent Ga(2) atoms. In the fourth Nd site, Nd(4) is bonded in a 13-coordinate geometry to four equivalent Fe(1), four equivalent Fe(3), four equivalent Fe(5), and one Ga(1) atom. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to one Nd(1), two equivalent Nd(4), one Fe(2), one Fe(4), three equivalent Fe(5), and four equivalent Fe(3) atoms. In the second Fe site, Fe(2) is bonded to one Nd(2), two equivalent Nd(3), one Fe(1), one Fe(4), four equivalent Fe(3), and three equivalent Ga(2) atoms to form distorted FeNd3Ga3Fe6 cuboctahedra that share corners with two equivalent Fe(2)Nd3Ga3Fe6 cuboctahedra, edges with four equivalent Fe(3)Nd2GaFe9 cuboctahedra, faces with two equivalent Fe(4)Ga2Fe10 cuboctahedra, faces with three equivalent Fe(5)Nd5Fe7 cuboctahedra, faces with five equivalent Fe(2)Nd3Ga3Fe6 cuboctahedra, and faces with six equivalent Fe(3)Nd2GaFe9 cuboctahedra. In the third Fe site, Fe(3) is bonded to one Nd(3), one Nd(4), one Fe(4), one Fe(5), two equivalent Fe(1), two equivalent Fe(2), three equivalent Fe(3), and one Ga(2) atom to form FeNd2GaFe9 cuboctahedra that share  a cornercorner with one Fe(4)Ga2Fe10 cuboctahedra, corners with two equivalent Fe(5)Nd5Fe7 cuboctahedra, corners with three equivalent Fe(3)Nd2GaFe9 cuboctahedra, edges with two equivalent Fe(2)Nd3Ga3Fe6 cuboctahedra, faces with two equivalent Fe(4)Ga2Fe10 cuboctahedra, faces with three equivalent Fe(2)Nd3Ga3Fe6 cuboctahedra, faces with four equivalent Fe(5)Nd5Fe7 cuboctahedra, and faces with seven equivalent Fe(3)Nd2GaFe9 cuboctahedra. In the fourth Fe site, Fe(4) is bonded to two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(5), four equivalent Fe(3), and two equivalent Ga(2) atoms to form FeGa2Fe10 cuboctahedra that share corners with two equivalent Fe(5)Nd5Fe7 cuboctahedra, corners with four equivalent Fe(3)Nd2GaFe9 cuboctahedra, faces with two equivalent Fe(5)Nd5Fe7 cuboctahedra, faces with four equivalent Fe(2)Nd3Ga3Fe6 cuboctahedra, and faces with eight equivalent Fe(3)Nd2GaFe9 cuboctahedra. In the fifth Fe site, Fe(5) is bonded to two equivalent Nd(4), three equivalent Nd(1), one Fe(4), one Fe(5), two equivalent Fe(3), and three equivalent Fe(1) atoms to form distorted FeNd5Fe7 cuboctahedra that share  a cornercorner with one Fe(4)Ga2Fe10 cuboctahedra, corners with two equivalent Fe(5)Nd5Fe7 cuboctahedra, corners with four equivalent Fe(3)Nd2GaFe9 cuboctahedra,  a faceface with one Fe(4)Ga2Fe10 cuboctahedra, faces with three equivalent Fe(2)Nd3Ga3Fe6 cuboctahedra, faces with five equivalent Fe(5)Nd5Fe7 cuboctahedra, and faces with eight equivalent Fe(3)Nd2GaFe9 cuboctahedra. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a distorted q6 geometry to one Nd(3), one Nd(4), four equivalent Nd(1), and four equivalent Nd(2) atoms. In the second Ga site, Ga(2) is bonded in a 12-coordinate geometry to two equivalent Nd(3), three equivalent Nd(2), one Fe(4), two equivalent Fe(3), three equivalent Fe(2), and one Ga(2) atom.
Nd6Ga3Fe11 crystallizes in the tetragonal I4cm space group. There are four inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 6-coordinate geometry to one Fe(1), three equivalent Fe(5), and two equivalent Ga(1) atoms. The Nd(1)-Fe(1) bond length is 2.98 Å. There are two shorter (3.18 Å) and one longer (3.31 Å) Nd(1)-Fe(5) bond length. Both Nd(1)-Ga(1) bond lengths are 3.38 Å. In the second Nd site, Nd(2) is bonded in a 6-coordinate geometry to one Fe(2), two equivalent Ga(1), and three equivalent Ga(2) atoms. The Nd(2)-Fe(2) bond length is 3.12 Å. Both Nd(2)-Ga(1) bond lengths are 3.34 Å. There are two shorter (3.25 Å) and one longer (3.26 Å) Nd(2)-Ga(2) bond length. In the third Nd site, Nd(3) is bonded in a 13-coordinate geometry to four equivalent Fe(2), four equivalent Fe(3), one Ga(1), and four equivalent Ga(2) atoms. All Nd(3)-Fe(2) bond lengths are 3.21 Å. All Nd(3)-Fe(3) bond lengths are 3.07 Å. The Nd(3)-Ga(1) bond length is 3.39 Å. All Nd(3)-Ga(2) bond lengths are 3.24 Å. In the fourth Nd site, Nd(4) is bonded in a 13-coordinate geometry to four equivalent Fe(1), four equivalent Fe(3), four equivalent Fe(5), and one Ga(1) atom. All Nd(4)-Fe(1) bond lengths are 3.18 Å. All Nd(4)-Fe(3) bond lengths are 3.04 Å. All Nd(4)-Fe(5) bond lengths are 3.28 Å. The Nd(4)-Ga(1) bond length is 3.40 Å. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to one Nd(1), two equivalent Nd(4), one Fe(2), one Fe(4), three equivalent Fe(5), and four equivalent Fe(3) atoms. The Fe(1)-Fe(2) bond length is 2.70 Å. The Fe(1)-Fe(4) bond length is 2.47 Å. There is one shorter (2.52 Å) and two longer (2.57 Å) Fe(1)-Fe(5) bond lengths. There are two shorter (2.48 Å) and two longer (2.59 Å) Fe(1)-Fe(3) bond lengths. In the second Fe site, Fe(2) is bonded to one Nd(2), two equivalent Nd(3), one Fe(1), one Fe(4), four equivalent Fe(3), and three equivalent Ga(2) atoms to form distorted FeNd3Ga3Fe6 cuboctahedra that share corners with two equivalent Fe(2)Nd3Ga3Fe6 cuboctahedra, edges with four equivalent Fe(3)Nd2GaFe9 cuboctahedra, faces with two equivalent Fe(4)Ga2Fe10 cuboctahedra, faces with three equivalent Fe(5)Nd5Fe7 cuboctahedra, faces with five equivalent Fe(2)Nd3Ga3Fe6 cuboctahedra, and faces with six equivalent Fe(3)Nd2GaFe9 cuboctahedra. The Fe(2)-Fe(4) bond length is 2.41 Å. There are two shorter (2.49 Å) and two longer (2.56 Å) Fe(2)-Fe(3) bond lengths. There is one shorter (2.52 Å) and two longer (2.61 Å) Fe(2)-Ga(2) bond lengths. In the third Fe site, Fe(3) is bonded to one Nd(3), one Nd(4), one Fe(4), one Fe(5), two equivalent Fe(1), two equivalent Fe(2), three equivalent Fe(3), and one Ga(2) atom to form FeNd2GaFe9 cuboctahedra that share  a cornercorner with one Fe(4)Ga2Fe10 cuboctahedra, corners with two equivalent Fe(5)Nd5Fe7 cuboctahedra, corners with three equivalent Fe(3)Nd2GaFe9 cuboctahedra, edges with two equivalent Fe(2)Nd3Ga3Fe6 cuboctahedra, faces with two equivalent Fe(4)Ga2Fe10 cuboctahedra, faces with three equivalent Fe(2)Nd3Ga3Fe6 cuboctahedra, faces with four equivalent Fe(5)Nd5Fe7 cuboctahedra, and faces with seven equivalent Fe(3)Nd2GaFe9 cuboctahedra. The Fe(3)-Fe(4) bond length is 2.42 Å. The Fe(3)-Fe(5) bond length is 2.64 Å. All Fe(3)-Fe(3) bond lengths are 2.54 Å. The Fe(3)-Ga(2) bond length is 2.67 Å. In the fourth Fe site, Fe(4) is bonded to two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(5), four equivalent Fe(3), and two equivalent Ga(2) atoms to form FeGa2Fe10 cuboctahedra that share corners with two equivalent Fe(5)Nd5Fe7 cuboctahedra, corners with four equivalent Fe(3)Nd2GaFe9 cuboctahedra, faces with two equivalent Fe(5)Nd5Fe7 cuboctahedra, faces with four equivalent Fe(2)Nd3Ga3Fe6 cuboctahedra, and faces with eight equivalent Fe(3)Nd2GaFe9 cuboctahedra. Both Fe(4)-Fe(5) bond lengths are 2.55 Å. Both Fe(4)-Ga(2) bond lengths are 2.64 Å. In the fifth Fe site, Fe(5) is bonded to two equivalent Nd(4), three equivalent Nd(1), one Fe(4), one Fe(5), two equivalent Fe(3), and three equivalent Fe(1) atoms to form distorted FeNd5Fe7 cuboctahedra that share  a cornercorner with one Fe(4)Ga2Fe10 cuboctahedra, corners with two equivalent Fe(5)Nd5Fe7 cuboctahedra, corners with four equivalent Fe(3)Nd2GaFe9 cuboctahedra,  a faceface with one Fe(4)Ga2Fe10 cuboctahedra, faces with three equivalent Fe(2)Nd3Ga3Fe6 cuboctahedra, faces with five equivalent Fe(5)Nd5Fe7 cuboctahedra, and faces with eight equivalent Fe(3)Nd2GaFe9 cuboctahedra. The Fe(5)-Fe(5) bond length is 2.62 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a distorted q6 geometry to one Nd(3), one Nd(4), four equivalent Nd(1), and four equivalent Nd(2) atoms. In the second Ga site, Ga(2) is bonded in a 12-coordinate geometry to two equivalent Nd(3), three equivalent Nd(2), one Fe(4), two equivalent Fe(3), three equivalent Fe(2), and one Ga(2) atom. The Ga(2)-Ga(2) bond length is 2.78 Å.