The material structure described by 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. is represented by the CIF file [CIF]
data_SrTb2Fe2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.592
_cell_length_b   5.592
_cell_length_c   19.608
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   613.200
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Sr  Sr0  1  0.259  0.259  0.000  1.0
  Sr  Sr1  1  0.241  0.759  0.500  1.0
  Sr  Sr2  1  0.759  0.241  0.500  1.0
  Sr  Sr3  1  0.741  0.741  0.000  1.0
  Tb  Tb4  1  0.277  0.277  0.183  1.0
  Tb  Tb5  1  0.223  0.777  0.683  1.0
  Tb  Tb6  1  0.777  0.223  0.683  1.0
  Tb  Tb7  1  0.777  0.223  0.317  1.0
  Tb  Tb8  1  0.223  0.777  0.317  1.0
  Tb  Tb9  1  0.723  0.723  0.183  1.0
  Tb  Tb10  1  0.277  0.277  0.817  1.0
  Tb  Tb11  1  0.723  0.723  0.817  1.0
  Fe  Fe12  1  0.258  0.258  0.399  1.0
  Fe  Fe13  1  0.242  0.758  0.899  1.0
  Fe  Fe14  1  0.758  0.242  0.899  1.0
  Fe  Fe15  1  0.758  0.242  0.101  1.0
  Fe  Fe16  1  0.242  0.758  0.101  1.0
  Fe  Fe17  1  0.742  0.742  0.399  1.0
  Fe  Fe18  1  0.258  0.258  0.601  1.0
  Fe  Fe19  1  0.742  0.742  0.601  1.0
  O  O20  1  0.705  0.705  0.500  1.0
  O  O21  1  0.795  0.205  0.000  1.0
  O  O22  1  0.205  0.795  0.000  1.0
  O  O23  1  0.295  0.295  0.500  1.0
  O  O24  1  0.186  0.186  0.290  1.0
  O  O25  1  0.314  0.686  0.790  1.0
  O  O26  1  0.686  0.314  0.790  1.0
  O  O27  1  0.686  0.314  0.210  1.0
  O  O28  1  0.314  0.686  0.210  1.0
  O  O29  1  0.814  0.814  0.290  1.0
  O  O30  1  0.186  0.186  0.710  1.0
  O  O31  1  0.814  0.814  0.710  1.0
  O  O32  1  0.000  0.500  0.112  1.0
  O  O33  1  0.000  0.500  0.612  1.0
  O  O34  1  0.500  0.000  0.388  1.0
  O  O35  1  0.500  0.000  0.888  1.0
  O  O36  1  0.000  0.500  0.888  1.0
  O  O37  1  0.000  0.500  0.388  1.0
  O  O38  1  0.500  0.000  0.612  1.0
  O  O39  1  0.500  0.000  0.112  1.0
  O  O40  1  0.000  0.000  0.131  1.0
  O  O41  1  0.500  0.500  0.631  1.0
  O  O42  1  0.500  0.500  0.369  1.0
  O  O43  1  0.000  0.000  0.869  1.0
  O  O44  1  0.000  0.000  0.410  1.0
  O  O45  1  0.500  0.500  0.910  1.0
  O  O46  1  0.500  0.500  0.090  1.0
  O  O47  1  0.000  0.000  0.590  1.0
[/CIF]
.
The material structure described by 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. is represented by the CIF file [CIF]
data_SrTb2Fe2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.592
_cell_length_b   5.592
_cell_length_c   19.608
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   613.200
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Sr  Sr0  1  0.259  0.259  0.000  1.0
  Sr  Sr1  1  0.241  0.759  0.500  1.0
  Sr  Sr2  1  0.759  0.241  0.500  1.0
  Sr  Sr3  1  0.741  0.741  0.000  1.0
  Tb  Tb4  1  0.277  0.277  0.183  1.0
  Tb  Tb5  1  0.223  0.777  0.683  1.0
  Tb  Tb6  1  0.777  0.223  0.683  1.0
  Tb  Tb7  1  0.777  0.223  0.317  1.0
  Tb  Tb8  1  0.223  0.777  0.317  1.0
  Tb  Tb9  1  0.723  0.723  0.183  1.0
  Tb  Tb10  1  0.277  0.277  0.817  1.0
  Tb  Tb11  1  0.723  0.723  0.817  1.0
  Fe  Fe12  1  0.258  0.258  0.399  1.0
  Fe  Fe13  1  0.242  0.758  0.899  1.0
  Fe  Fe14  1  0.758  0.242  0.899  1.0
  Fe  Fe15  1  0.758  0.242  0.101  1.0
  Fe  Fe16  1  0.242  0.758  0.101  1.0
  Fe  Fe17  1  0.742  0.742  0.399  1.0
  Fe  Fe18  1  0.258  0.258  0.601  1.0
  Fe  Fe19  1  0.742  0.742  0.601  1.0
  O  O20  1  0.705  0.705  0.500  1.0
  O  O21  1  0.795  0.205  0.000  1.0
  O  O22  1  0.205  0.795  0.000  1.0
  O  O23  1  0.295  0.295  0.500  1.0
  O  O24  1  0.186  0.186  0.290  1.0
  O  O25  1  0.314  0.686  0.790  1.0
  O  O26  1  0.686  0.314  0.790  1.0
  O  O27  1  0.686  0.314  0.210  1.0
  O  O28  1  0.314  0.686  0.210  1.0
  O  O29  1  0.814  0.814  0.290  1.0
  O  O30  1  0.186  0.186  0.710  1.0
  O  O31  1  0.814  0.814  0.710  1.0
  O  O32  1  0.000  0.500  0.112  1.0
  O  O33  1  0.000  0.500  0.612  1.0
  O  O34  1  0.500  0.000  0.388  1.0
  O  O35  1  0.500  0.000  0.888  1.0
  O  O36  1  0.000  0.500  0.888  1.0
  O  O37  1  0.000  0.500  0.388  1.0
  O  O38  1  0.500  0.000  0.612  1.0
  O  O39  1  0.500  0.000  0.112  1.0
  O  O40  1  0.000  0.000  0.131  1.0
  O  O41  1  0.500  0.500  0.631  1.0
  O  O42  1  0.500  0.500  0.369  1.0
  O  O43  1  0.000  0.000  0.869  1.0
  O  O44  1  0.000  0.000  0.410  1.0
  O  O45  1  0.500  0.500  0.910  1.0
  O  O46  1  0.500  0.500  0.090  1.0
  O  O47  1  0.000  0.000  0.590  1.0
[/CIF]
.