Nd2MnFe3Ge4 crystallizes in the tetragonal P-4m2 space group. Nd(1) is bonded in a 16-coordinate geometry to two equivalent Mn(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), four equivalent Ge(1), and four equivalent Ge(2) atoms. Mn(1) is bonded to four equivalent Nd(1), four equivalent Fe(2), and four equivalent Ge(1) atoms to form distorted MnNd4Fe4Ge4 tetrahedra that share corners with four equivalent Mn(1)Nd4Fe4Ge4 tetrahedra, corners with four equivalent Fe(3)Nd4Ge4 tetrahedra, corners with eight equivalent Fe(1)Nd4Ge4 tetrahedra, edges with two equivalent Fe(3)Nd4Ge4 tetrahedra, faces with four equivalent Fe(2)Nd4Mn4Ge4 cuboctahedra, and faces with four equivalent Mn(1)Nd4Fe4Ge4 tetrahedra. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to four equivalent Nd(1) and four equivalent Ge(2) atoms to form distorted FeNd4Ge4 tetrahedra that share corners with four equivalent Fe(2)Nd4Mn4Ge4 cuboctahedra, corners with eight equivalent Mn(1)Nd4Fe4Ge4 tetrahedra, edges with two equivalent Fe(2)Nd4Mn4Ge4 cuboctahedra, edges with four equivalent Fe(1)Nd4Ge4 tetrahedra, and faces with four equivalent Fe(3)Nd4Ge4 tetrahedra. In the second Fe site, Fe(2) is bonded to four equivalent Nd(1), four equivalent Mn(1), and four equivalent Ge(1) atoms to form distorted FeNd4Mn4Ge4 cuboctahedra that share corners with four equivalent Fe(2)Nd4Mn4Ge4 cuboctahedra, corners with four equivalent Fe(1)Nd4Ge4 tetrahedra, corners with eight equivalent Fe(3)Nd4Ge4 tetrahedra, edges with two equivalent Fe(1)Nd4Ge4 tetrahedra, faces with four equivalent Fe(2)Nd4Mn4Ge4 cuboctahedra, and faces with four equivalent Mn(1)Nd4Fe4Ge4 tetrahedra. In the third Fe site, Fe(3) is bonded to four equivalent Nd(1) and four equivalent Ge(2) atoms to form distorted FeNd4Ge4 tetrahedra that share corners with eight equivalent Fe(2)Nd4Mn4Ge4 cuboctahedra, corners with four equivalent Mn(1)Nd4Fe4Ge4 tetrahedra, edges with two equivalent Mn(1)Nd4Fe4Ge4 tetrahedra, edges with four equivalent Fe(3)Nd4Ge4 tetrahedra, and faces with four equivalent Fe(1)Nd4Ge4 tetrahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to four equivalent Nd(1), two equivalent Mn(1), two equivalent Fe(2), and one Ge(2) atom. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to four equivalent Nd(1), two equivalent Fe(1), two equivalent Fe(3), and one Ge(1) atom.
Nd2MnFe3Ge4 crystallizes in the tetragonal P-4m2 space group. Nd(1) is bonded in a 16-coordinate geometry to two equivalent Mn(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), four equivalent Ge(1), and four equivalent Ge(2) atoms. Both Nd(1)-Mn(1) bond lengths are 3.41 Å. Both Nd(1)-Fe(1) bond lengths are 3.29 Å. Both Nd(1)-Fe(2) bond lengths are 3.41 Å. Both Nd(1)-Fe(3) bond lengths are 3.29 Å. All Nd(1)-Ge(1) bond lengths are 3.20 Å. All Nd(1)-Ge(2) bond lengths are 3.20 Å. Mn(1) is bonded to four equivalent Nd(1), four equivalent Fe(2), and four equivalent Ge(1) atoms to form distorted MnNd4Fe4Ge4 tetrahedra that share corners with four equivalent Mn(1)Nd4Fe4Ge4 tetrahedra, corners with four equivalent Fe(3)Nd4Ge4 tetrahedra, corners with eight equivalent Fe(1)Nd4Ge4 tetrahedra, edges with two equivalent Fe(3)Nd4Ge4 tetrahedra, faces with four equivalent Fe(2)Nd4Mn4Ge4 cuboctahedra, and faces with four equivalent Mn(1)Nd4Fe4Ge4 tetrahedra. All Mn(1)-Fe(2) bond lengths are 2.92 Å. All Mn(1)-Ge(1) bond lengths are 2.50 Å. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to four equivalent Nd(1) and four equivalent Ge(2) atoms to form distorted FeNd4Ge4 tetrahedra that share corners with four equivalent Fe(2)Nd4Mn4Ge4 cuboctahedra, corners with eight equivalent Mn(1)Nd4Fe4Ge4 tetrahedra, edges with two equivalent Fe(2)Nd4Mn4Ge4 cuboctahedra, edges with four equivalent Fe(1)Nd4Ge4 tetrahedra, and faces with four equivalent Fe(3)Nd4Ge4 tetrahedra. All Fe(1)-Ge(2) bond lengths are 2.40 Å. In the second Fe site, Fe(2) is bonded to four equivalent Nd(1), four equivalent Mn(1), and four equivalent Ge(1) atoms to form distorted FeNd4Mn4Ge4 cuboctahedra that share corners with four equivalent Fe(2)Nd4Mn4Ge4 cuboctahedra, corners with four equivalent Fe(1)Nd4Ge4 tetrahedra, corners with eight equivalent Fe(3)Nd4Ge4 tetrahedra, edges with two equivalent Fe(1)Nd4Ge4 tetrahedra, faces with four equivalent Fe(2)Nd4Mn4Ge4 cuboctahedra, and faces with four equivalent Mn(1)Nd4Fe4Ge4 tetrahedra. All Fe(2)-Ge(1) bond lengths are 2.50 Å. In the third Fe site, Fe(3) is bonded to four equivalent Nd(1) and four equivalent Ge(2) atoms to form distorted FeNd4Ge4 tetrahedra that share corners with eight equivalent Fe(2)Nd4Mn4Ge4 cuboctahedra, corners with four equivalent Mn(1)Nd4Fe4Ge4 tetrahedra, edges with two equivalent Mn(1)Nd4Fe4Ge4 tetrahedra, edges with four equivalent Fe(3)Nd4Ge4 tetrahedra, and faces with four equivalent Fe(1)Nd4Ge4 tetrahedra. All Fe(3)-Ge(2) bond lengths are 2.40 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to four equivalent Nd(1), two equivalent Mn(1), two equivalent Fe(2), and one Ge(2) atom. The Ge(1)-Ge(2) bond length is 2.63 Å. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to four equivalent Nd(1), two equivalent Fe(1), two equivalent Fe(3), and one Ge(1) atom.