Nd2Mn3FeGe4 crystallizes in the tetragonal P-4m2 space group. Nd(1) is bonded in a 16-coordinate geometry to two equivalent Mn(1), two equivalent Mn(2), two equivalent Mn(3), two equivalent Fe(1), four equivalent Ge(1), and four equivalent Ge(2) atoms. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to four equivalent Nd(1) and four equivalent Ge(2) atoms to form MnNd4Ge4 tetrahedra that share corners with four equivalent Mn(2)Nd4Ge4 tetrahedra, corners with eight equivalent Fe(1)Nd4Ge4 tetrahedra, edges with two equivalent Mn(2)Nd4Ge4 tetrahedra, edges with four equivalent Mn(1)Nd4Ge4 tetrahedra, and faces with four equivalent Mn(3)Nd4Ge4 tetrahedra. In the second Mn site, Mn(2) is bonded to four equivalent Nd(1) and four equivalent Ge(1) atoms to form distorted MnNd4Ge4 tetrahedra that share corners with four equivalent Mn(1)Nd4Ge4 tetrahedra, corners with eight equivalent Mn(3)Nd4Ge4 tetrahedra, edges with two equivalent Mn(1)Nd4Ge4 tetrahedra, edges with four equivalent Mn(2)Nd4Ge4 tetrahedra, and faces with four equivalent Fe(1)Nd4Ge4 tetrahedra. In the third Mn site, Mn(3) is bonded to four equivalent Nd(1) and four equivalent Ge(2) atoms to form MnNd4Ge4 tetrahedra that share corners with four equivalent Fe(1)Nd4Ge4 tetrahedra, corners with eight equivalent Mn(2)Nd4Ge4 tetrahedra, edges with two equivalent Fe(1)Nd4Ge4 tetrahedra, edges with four equivalent Mn(3)Nd4Ge4 tetrahedra, and faces with four equivalent Mn(1)Nd4Ge4 tetrahedra. Fe(1) is bonded to four equivalent Nd(1) and four equivalent Ge(1) atoms to form distorted FeNd4Ge4 tetrahedra that share corners with four equivalent Mn(3)Nd4Ge4 tetrahedra, corners with eight equivalent Mn(1)Nd4Ge4 tetrahedra, edges with two equivalent Mn(3)Nd4Ge4 tetrahedra, edges with four equivalent Fe(1)Nd4Ge4 tetrahedra, and faces with four equivalent Mn(2)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(2), two equivalent Fe(1), 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 Mn(1), two equivalent Mn(3), and one Ge(1) atom.
Nd2Mn3FeGe4 crystallizes in the tetragonal P-4m2 space group. Nd(1) is bonded in a 16-coordinate geometry to two equivalent Mn(1), two equivalent Mn(2), two equivalent Mn(3), two equivalent Fe(1), four equivalent Ge(1), and four equivalent Ge(2) atoms. Both Nd(1)-Mn(1) bond lengths are 3.40 Å. Both Nd(1)-Mn(2) bond lengths are 3.35 Å. Both Nd(1)-Mn(3) bond lengths are 3.40 Å. Both Nd(1)-Fe(1) bond lengths are 3.35 Å. All Nd(1)-Ge(1) bond lengths are 3.15 Å. All Nd(1)-Ge(2) bond lengths are 3.16 Å. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to four equivalent Nd(1) and four equivalent Ge(2) atoms to form MnNd4Ge4 tetrahedra that share corners with four equivalent Mn(2)Nd4Ge4 tetrahedra, corners with eight equivalent Fe(1)Nd4Ge4 tetrahedra, edges with two equivalent Mn(2)Nd4Ge4 tetrahedra, edges with four equivalent Mn(1)Nd4Ge4 tetrahedra, and faces with four equivalent Mn(3)Nd4Ge4 tetrahedra. All Mn(1)-Ge(2) bond lengths are 2.43 Å. In the second Mn site, Mn(2) is bonded to four equivalent Nd(1) and four equivalent Ge(1) atoms to form distorted MnNd4Ge4 tetrahedra that share corners with four equivalent Mn(1)Nd4Ge4 tetrahedra, corners with eight equivalent Mn(3)Nd4Ge4 tetrahedra, edges with two equivalent Mn(1)Nd4Ge4 tetrahedra, edges with four equivalent Mn(2)Nd4Ge4 tetrahedra, and faces with four equivalent Fe(1)Nd4Ge4 tetrahedra. All Mn(2)-Ge(1) bond lengths are 2.41 Å. In the third Mn site, Mn(3) is bonded to four equivalent Nd(1) and four equivalent Ge(2) atoms to form MnNd4Ge4 tetrahedra that share corners with four equivalent Fe(1)Nd4Ge4 tetrahedra, corners with eight equivalent Mn(2)Nd4Ge4 tetrahedra, edges with two equivalent Fe(1)Nd4Ge4 tetrahedra, edges with four equivalent Mn(3)Nd4Ge4 tetrahedra, and faces with four equivalent Mn(1)Nd4Ge4 tetrahedra. All Mn(3)-Ge(2) bond lengths are 2.43 Å. Fe(1) is bonded to four equivalent Nd(1) and four equivalent Ge(1) atoms to form distorted FeNd4Ge4 tetrahedra that share corners with four equivalent Mn(3)Nd4Ge4 tetrahedra, corners with eight equivalent Mn(1)Nd4Ge4 tetrahedra, edges with two equivalent Mn(3)Nd4Ge4 tetrahedra, edges with four equivalent Fe(1)Nd4Ge4 tetrahedra, and faces with four equivalent Mn(2)Nd4Ge4 tetrahedra. All Fe(1)-Ge(1) bond lengths are 2.41 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(2), two equivalent Fe(1), and one Ge(2) atom. The Ge(1)-Ge(2) bond length is 2.72 Å. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to four equivalent Nd(1), two equivalent Mn(1), two equivalent Mn(3), and one Ge(1) atom.