SrTb2Fe2O7 crystallizes in the tetragonal P4_2/mnm space group. Sr(1) is bonded in a 10-coordinate geometry to two equivalent O(5), four equivalent O(1), and four equivalent O(3) atoms. Tb(1) is bonded in a 7-coordinate geometry to one O(4), one O(5), two equivalent O(3), and three equivalent O(2) atoms. Fe(1) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(3) atoms to form corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles range from 12-34°. There are five inequivalent O sites. In the first O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Tb(1), and two equivalent Fe(1) atoms. In the second O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Tb(1) and two equivalent Fe(1) atoms. In the third O site, O(5) is bonded to two equivalent Sr(1), two equivalent Tb(1), and two equivalent Fe(1) atoms to form edge-sharing OSr2Tb2Fe2 octahedra. In the fourth O site, O(1) is bonded in a 6-coordinate geometry to four equivalent Sr(1) and two equivalent Fe(1) atoms. In the fifth O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to three equivalent Tb(1) and one Fe(1) atom.
SrTb2Fe2O7 crystallizes in the tetragonal P4_2/mnm space group. Sr(1) is bonded in a 10-coordinate geometry to two equivalent O(5), four equivalent O(1), and four equivalent O(3) atoms. Both Sr(1)-O(5) bond lengths are 2.60 Å. There are two shorter (2.61 Å) and two longer (3.01 Å) Sr(1)-O(1) bond lengths. All Sr(1)-O(3) bond lengths are 2.96 Å. Tb(1) is bonded in a 7-coordinate geometry to one O(4), one O(5), two equivalent O(3), and three equivalent O(2) atoms. The Tb(1)-O(4) bond length is 2.42 Å. The Tb(1)-O(5) bond length is 2.54 Å. Both Tb(1)-O(3) bond lengths are 2.43 Å. There is one shorter (2.20 Å) and two longer (2.35 Å) Tb(1)-O(2) bond lengths. Fe(1) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(3) atoms to form corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles range from 12-34°. The Fe(1)-O(1) bond length is 2.00 Å. The Fe(1)-O(2) bond length is 2.22 Å. The Fe(1)-O(4) bond length is 2.00 Å. The Fe(1)-O(5) bond length is 2.05 Å. Both Fe(1)-O(3) bond lengths are 1.99 Å. There are five inequivalent O sites. In the first O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Tb(1), and two equivalent Fe(1) atoms. In the second O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Tb(1) and two equivalent Fe(1) atoms. In the third O site, O(5) is bonded to two equivalent Sr(1), two equivalent Tb(1), and two equivalent Fe(1) atoms to form edge-sharing OSr2Tb2Fe2 octahedra. In the fourth O site, O(1) is bonded in a 6-coordinate geometry to four equivalent Sr(1) and two equivalent Fe(1) atoms. In the fifth O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to three equivalent Tb(1) and one Fe(1) atom.