The compound described by Fe7Zn2O12 is Spinel-like structured and crystallizes in the tetragonal I4_1/amd space group. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form FeO6 octahedra that share corners with two equivalent Fe(3)O4 tetrahedra, corners with four equivalent Zn(1)O4 tetrahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with four equivalent Fe(2)O6 octahedra. In the second Fe site, Fe(2) is bonded to one O(1), two equivalent O(2), and three equivalent O(3) atoms to form FeO6 octahedra that share corners with two equivalent Fe(3)O4 tetrahedra, corners with four equivalent Zn(1)O4 tetrahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with four equivalent Fe(2)O6 octahedra. In the third Fe site, Fe(3) is bonded to four equivalent O(2) atoms to form corner-sharing FeO4 tetrahedra. The corner-sharing octahedral tilt angles are 59°. Zn(1) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form ZnO4 tetrahedra that share corners with four equivalent Fe(1)O6 octahedra and corners with eight equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles are 58°. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Fe(2), two equivalent Fe(1), and one Zn(1) atom to form distorted OZnFe3 trigonal pyramids that share corners with two equivalent O(2)Fe4 trigonal pyramids, corners with five equivalent O(1)ZnFe3 trigonal pyramids, corners with five equivalent O(3)ZnFe3 trigonal pyramids,  an edgeedge with one O(1)ZnFe3 trigonal pyramid, and edges with two equivalent O(2)Fe4 trigonal pyramids. In the second O site, O(2) is bonded to one Fe(1), one Fe(3), and two equivalent Fe(2) atoms to form distorted OFe4 trigonal pyramids that share corners with two equivalent O(1)ZnFe3 trigonal pyramids, corners with four equivalent O(2)Fe4 trigonal pyramids, corners with six equivalent O(3)ZnFe3 trigonal pyramids,  an edgeedge with one O(2)Fe4 trigonal pyramid, and edges with two equivalent O(1)ZnFe3 trigonal pyramids. In the third O site, O(3) is bonded to three equivalent Fe(2) and one Zn(1) atom to form distorted OZnFe3 trigonal pyramids that share  a cornercorner with one O(3)ZnFe3 trigonal pyramid, corners with five equivalent O(1)ZnFe3 trigonal pyramids, corners with six equivalent O(2)Fe4 trigonal pyramids, and edges with three equivalent O(3)ZnFe3 trigonal pyramids. is represented by the CIF card [CIF]
data_Zn2Fe7O12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   13.552
_cell_length_b   13.552
_cell_length_c   13.552
_cell_angle_alpha   154.149
_cell_angle_beta   154.149
_cell_angle_gamma   36.883
_symmetry_Int_Tables_number   1
_cell_volume   472.500
_cell_formula_units_Z   2
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
  Zn  Zn0  1  0.834  0.834  0.000  1.0
  Zn  Zn1  1  0.916  0.416  0.500  1.0
  Zn  Zn2  1  0.584  0.084  0.500  1.0
  Zn  Zn3  1  0.166  0.166  0.000  1.0
  Fe  Fe4  1  0.375  0.625  0.250  1.0
  Fe  Fe5  1  0.375  0.125  0.750  1.0
  Fe  Fe6  1  0.708  0.958  0.750  1.0
  Fe  Fe7  1  0.208  0.958  0.250  1.0
  Fe  Fe8  1  0.500  0.500  0.000  1.0
  Fe  Fe9  1  0.042  0.792  0.750  1.0
  Fe  Fe10  1  0.042  0.292  0.250  1.0
  Fe  Fe11  1  0.875  0.625  0.250  1.0
  Fe  Fe12  1  0.375  0.625  0.750  1.0
  Fe  Fe13  1  0.708  0.958  0.250  1.0
  Fe  Fe14  1  0.708  0.458  0.750  1.0
  Fe  Fe15  1  0.250  0.750  0.500  1.0
  Fe  Fe16  1  0.042  0.292  0.750  1.0
  Fe  Fe17  1  0.542  0.292  0.250  1.0
  O  O18  1  0.142  0.372  0.771  1.0
  O  O19  1  0.601  0.372  0.229  1.0
  O  O20  1  0.149  0.878  0.271  1.0
  O  O21  1  0.608  0.878  0.729  1.0
  O  O22  1  0.454  0.180  0.725  1.0
  O  O23  1  0.454  0.729  0.275  1.0
  O  O24  1  0.962  0.733  0.771  1.0
  O  O25  1  0.962  0.191  0.229  1.0
  O  O26  1  0.267  0.038  0.229  1.0
  O  O27  1  0.809  0.038  0.771  1.0
  O  O28  1  0.271  0.546  0.725  1.0
  O  O29  1  0.820  0.546  0.275  1.0
  O  O30  1  0.122  0.392  0.271  1.0
  O  O31  1  0.122  0.851  0.729  1.0
  O  O32  1  0.628  0.399  0.771  1.0
  O  O33  1  0.628  0.858  0.229  1.0
  O  O34  1  0.930  0.704  0.225  1.0
  O  O35  1  0.479  0.704  0.775  1.0
  O  O36  1  0.941  0.212  0.729  1.0
  O  O37  1  0.483  0.212  0.271  1.0
  O  O38  1  0.788  0.059  0.271  1.0
  O  O39  1  0.788  0.517  0.729  1.0
  O  O40  1  0.296  0.070  0.775  1.0
  O  O41  1  0.296  0.521  0.225  1.0
[/CIF]
.
The compound described by Fe7Zn2O12 is Spinel-like structured and crystallizes in the tetragonal I4_1/amd space group. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form FeO6 octahedra that share corners with two equivalent Fe(3)O4 tetrahedra, corners with four equivalent Zn(1)O4 tetrahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with four equivalent Fe(2)O6 octahedra. In the second Fe site, Fe(2) is bonded to one O(1), two equivalent O(2), and three equivalent O(3) atoms to form FeO6 octahedra that share corners with two equivalent Fe(3)O4 tetrahedra, corners with four equivalent Zn(1)O4 tetrahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with four equivalent Fe(2)O6 octahedra. In the third Fe site, Fe(3) is bonded to four equivalent O(2) atoms to form corner-sharing FeO4 tetrahedra. The corner-sharing octahedral tilt angles are 59°. Zn(1) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form ZnO4 tetrahedra that share corners with four equivalent Fe(1)O6 octahedra and corners with eight equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles are 58°. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Fe(2), two equivalent Fe(1), and one Zn(1) atom to form distorted OZnFe3 trigonal pyramids that share corners with two equivalent O(2)Fe4 trigonal pyramids, corners with five equivalent O(1)ZnFe3 trigonal pyramids, corners with five equivalent O(3)ZnFe3 trigonal pyramids,  an edgeedge with one O(1)ZnFe3 trigonal pyramid, and edges with two equivalent O(2)Fe4 trigonal pyramids. In the second O site, O(2) is bonded to one Fe(1), one Fe(3), and two equivalent Fe(2) atoms to form distorted OFe4 trigonal pyramids that share corners with two equivalent O(1)ZnFe3 trigonal pyramids, corners with four equivalent O(2)Fe4 trigonal pyramids, corners with six equivalent O(3)ZnFe3 trigonal pyramids,  an edgeedge with one O(2)Fe4 trigonal pyramid, and edges with two equivalent O(1)ZnFe3 trigonal pyramids. In the third O site, O(3) is bonded to three equivalent Fe(2) and one Zn(1) atom to form distorted OZnFe3 trigonal pyramids that share  a cornercorner with one O(3)ZnFe3 trigonal pyramid, corners with five equivalent O(1)ZnFe3 trigonal pyramids, corners with six equivalent O(2)Fe4 trigonal pyramids, and edges with three equivalent O(3)ZnFe3 trigonal pyramids. is represented by the CIF card [CIF]
data_Zn2Fe7O12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   13.552
_cell_length_b   13.552
_cell_length_c   13.552
_cell_angle_alpha   154.149
_cell_angle_beta   154.149
_cell_angle_gamma   36.883
_symmetry_Int_Tables_number   1
_cell_volume   472.500
_cell_formula_units_Z   2
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
  Zn  Zn0  1  0.834  0.834  0.000  1.0
  Zn  Zn1  1  0.916  0.416  0.500  1.0
  Zn  Zn2  1  0.584  0.084  0.500  1.0
  Zn  Zn3  1  0.166  0.166  0.000  1.0
  Fe  Fe4  1  0.375  0.625  0.250  1.0
  Fe  Fe5  1  0.375  0.125  0.750  1.0
  Fe  Fe6  1  0.708  0.958  0.750  1.0
  Fe  Fe7  1  0.208  0.958  0.250  1.0
  Fe  Fe8  1  0.500  0.500  0.000  1.0
  Fe  Fe9  1  0.042  0.792  0.750  1.0
  Fe  Fe10  1  0.042  0.292  0.250  1.0
  Fe  Fe11  1  0.875  0.625  0.250  1.0
  Fe  Fe12  1  0.375  0.625  0.750  1.0
  Fe  Fe13  1  0.708  0.958  0.250  1.0
  Fe  Fe14  1  0.708  0.458  0.750  1.0
  Fe  Fe15  1  0.250  0.750  0.500  1.0
  Fe  Fe16  1  0.042  0.292  0.750  1.0
  Fe  Fe17  1  0.542  0.292  0.250  1.0
  O  O18  1  0.142  0.372  0.771  1.0
  O  O19  1  0.601  0.372  0.229  1.0
  O  O20  1  0.149  0.878  0.271  1.0
  O  O21  1  0.608  0.878  0.729  1.0
  O  O22  1  0.454  0.180  0.725  1.0
  O  O23  1  0.454  0.729  0.275  1.0
  O  O24  1  0.962  0.733  0.771  1.0
  O  O25  1  0.962  0.191  0.229  1.0
  O  O26  1  0.267  0.038  0.229  1.0
  O  O27  1  0.809  0.038  0.771  1.0
  O  O28  1  0.271  0.546  0.725  1.0
  O  O29  1  0.820  0.546  0.275  1.0
  O  O30  1  0.122  0.392  0.271  1.0
  O  O31  1  0.122  0.851  0.729  1.0
  O  O32  1  0.628  0.399  0.771  1.0
  O  O33  1  0.628  0.858  0.229  1.0
  O  O34  1  0.930  0.704  0.225  1.0
  O  O35  1  0.479  0.704  0.775  1.0
  O  O36  1  0.941  0.212  0.729  1.0
  O  O37  1  0.483  0.212  0.271  1.0
  O  O38  1  0.788  0.059  0.271  1.0
  O  O39  1  0.788  0.517  0.729  1.0
  O  O40  1  0.296  0.070  0.775  1.0
  O  O41  1  0.296  0.521  0.225  1.0
[/CIF]
.