NdFeGe2O7 crystallizes in the monoclinic P2_1/c space group. Nd(1) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(7), two equivalent O(2), and two equivalent O(6) atoms. Fe(1) is bonded to one O(1), one O(3), one O(5), one O(6), and one O(7) atom to form FeO5 trigonal bipyramids that share corners with two equivalent Ge(1)O4 tetrahedra and corners with three equivalent Ge(2)O4 tetrahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form GeO4 tetrahedra that share  a cornercorner with one Ge(2)O4 tetrahedra and corners with two equivalent Fe(1)O5 trigonal bipyramids. In the second Ge site, Ge(2) is bonded to one O(1), one O(3), one O(4), and one O(7) atom to form GeO4 tetrahedra that share  a cornercorner with one Ge(1)O4 tetrahedra and corners with three equivalent Fe(1)O5 trigonal bipyramids. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a distorted trigonal planar geometry to one Nd(1), one Fe(1), and one Ge(1) atom. In the second O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Nd(1), one Fe(1), and one Ge(1) atom. In the third O site, O(7) is bonded in a 3-coordinate geometry to one Nd(1), one Fe(1), and one Ge(2) atom. In the fourth O site, O(1) is bonded in a distorted trigonal planar geometry to one Nd(1), one Fe(1), and one Ge(2) atom. In the fifth O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Nd(1) and one Ge(1) atom. In the sixth O site, O(3) is bonded in a distorted trigonal planar geometry to one Nd(1), one Fe(1), and one Ge(2) atom. In the seventh O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Nd(1), one Ge(1), and one Ge(2) atom.
NdFeGe2O7 crystallizes in the monoclinic P2_1/c space group. Nd(1) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(7), two equivalent O(2), and two equivalent O(6) atoms. The Nd(1)-O(1) bond length is 2.54 Å. The Nd(1)-O(3) bond length is 2.51 Å. The Nd(1)-O(4) bond length is 2.72 Å. The Nd(1)-O(5) bond length is 2.39 Å. The Nd(1)-O(7) bond length is 2.69 Å. There is one shorter (2.37 Å) and one longer (2.47 Å) Nd(1)-O(2) bond length. There is one shorter (2.54 Å) and one longer (2.76 Å) Nd(1)-O(6) bond length. Fe(1) is bonded to one O(1), one O(3), one O(5), one O(6), and one O(7) atom to form FeO5 trigonal bipyramids that share corners with two equivalent Ge(1)O4 tetrahedra and corners with three equivalent Ge(2)O4 tetrahedra. The Fe(1)-O(1) bond length is 1.93 Å. The Fe(1)-O(3) bond length is 2.04 Å. The Fe(1)-O(5) bond length is 1.93 Å. The Fe(1)-O(6) bond length is 1.98 Å. The Fe(1)-O(7) bond length is 2.01 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form GeO4 tetrahedra that share  a cornercorner with one Ge(2)O4 tetrahedra and corners with two equivalent Fe(1)O5 trigonal bipyramids. The Ge(1)-O(2) bond length is 1.73 Å. The Ge(1)-O(4) bond length is 1.80 Å. The Ge(1)-O(5) bond length is 1.76 Å. The Ge(1)-O(6) bond length is 1.80 Å. In the second Ge site, Ge(2) is bonded to one O(1), one O(3), one O(4), and one O(7) atom to form GeO4 tetrahedra that share  a cornercorner with one Ge(1)O4 tetrahedra and corners with three equivalent Fe(1)O5 trigonal bipyramids. The Ge(2)-O(1) bond length is 1.78 Å. The Ge(2)-O(3) bond length is 1.76 Å. The Ge(2)-O(4) bond length is 1.83 Å. The Ge(2)-O(7) bond length is 1.76 Å. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a distorted trigonal planar geometry to one Nd(1), one Fe(1), and one Ge(1) atom. In the second O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Nd(1), one Fe(1), and one Ge(1) atom. In the third O site, O(7) is bonded in a 3-coordinate geometry to one Nd(1), one Fe(1), and one Ge(2) atom. In the fourth O site, O(1) is bonded in a distorted trigonal planar geometry to one Nd(1), one Fe(1), and one Ge(2) atom. In the fifth O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Nd(1) and one Ge(1) atom. In the sixth O site, O(3) is bonded in a distorted trigonal planar geometry to one Nd(1), one Fe(1), and one Ge(2) atom. In the seventh O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Nd(1), one Ge(1), and one Ge(2) atom.