The compound described by Cr2Zn2O5 crystallizes in the orthorhombic Pbam space group. Cr(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted CrO5 trigonal bipyramids that share corners with five equivalent Cr(1)O5 trigonal bipyramids, corners with four equivalent Zn(1)O4 trigonal pyramids, and edges with two equivalent Zn(1)O4 trigonal pyramids. Zn(1) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form distorted ZnO4 trigonal pyramids that share corners with four equivalent Cr(1)O5 trigonal bipyramids, corners with two equivalent Zn(1)O4 trigonal pyramids, edges with two equivalent Cr(1)O5 trigonal bipyramids, and  an edgeedge with one Zn(1)O4 trigonal pyramid. There are three inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Cr(1) atoms. In the second O site, O(2) is bonded to two equivalent Cr(1) and two equivalent Zn(1) atoms to form a mixture of corner and edge-sharing OZn2Cr2 tetrahedra. In the third O site, O(3) is bonded to two equivalent Cr(1) and two equivalent Zn(1) atoms to form a mixture of distorted corner and edge-sharing OZn2Cr2 trigonal pyramids. is represented by the CIF card [CIF]
data_Zn2Cr2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.760
_cell_length_b   5.345
_cell_length_c   10.255
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   206.136
_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  0.000  0.280  0.401  1.0
  Zn  Zn1  1  0.000  0.720  0.599  1.0
  Zn  Zn2  1  0.000  0.780  0.099  1.0
  Zn  Zn3  1  0.000  0.220  0.901  1.0
  Cr  Cr4  1  0.500  0.242  0.135  1.0
  Cr  Cr5  1  0.500  0.758  0.865  1.0
  Cr  Cr6  1  0.500  0.258  0.635  1.0
  Cr  Cr7  1  0.500  0.742  0.365  1.0
  O  O8  1  0.500  0.500  0.000  1.0
  O  O9  1  0.500  0.135  0.814  1.0
  O  O10  1  0.500  0.635  0.686  1.0
  O  O11  1  0.500  0.365  0.314  1.0
  O  O12  1  0.000  0.313  0.599  1.0
  O  O13  1  0.000  0.687  0.401  1.0
  O  O14  1  0.500  0.865  0.186  1.0
  O  O15  1  0.000  0.187  0.099  1.0
  O  O16  1  0.500  0.000  0.500  1.0
  O  O17  1  0.000  0.813  0.901  1.0
[/CIF]
.
The compound described by Cr2Zn2O5 crystallizes in the orthorhombic Pbam space group. Cr(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted CrO5 trigonal bipyramids that share corners with five equivalent Cr(1)O5 trigonal bipyramids, corners with four equivalent Zn(1)O4 trigonal pyramids, and edges with two equivalent Zn(1)O4 trigonal pyramids. Zn(1) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form distorted ZnO4 trigonal pyramids that share corners with four equivalent Cr(1)O5 trigonal bipyramids, corners with two equivalent Zn(1)O4 trigonal pyramids, edges with two equivalent Cr(1)O5 trigonal bipyramids, and  an edgeedge with one Zn(1)O4 trigonal pyramid. There are three inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Cr(1) atoms. In the second O site, O(2) is bonded to two equivalent Cr(1) and two equivalent Zn(1) atoms to form a mixture of corner and edge-sharing OZn2Cr2 tetrahedra. In the third O site, O(3) is bonded to two equivalent Cr(1) and two equivalent Zn(1) atoms to form a mixture of distorted corner and edge-sharing OZn2Cr2 trigonal pyramids. is represented by the CIF card [CIF]
data_Zn2Cr2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.760
_cell_length_b   5.345
_cell_length_c   10.255
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   206.136
_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  0.000  0.280  0.401  1.0
  Zn  Zn1  1  0.000  0.720  0.599  1.0
  Zn  Zn2  1  0.000  0.780  0.099  1.0
  Zn  Zn3  1  0.000  0.220  0.901  1.0
  Cr  Cr4  1  0.500  0.242  0.135  1.0
  Cr  Cr5  1  0.500  0.758  0.865  1.0
  Cr  Cr6  1  0.500  0.258  0.635  1.0
  Cr  Cr7  1  0.500  0.742  0.365  1.0
  O  O8  1  0.500  0.500  0.000  1.0
  O  O9  1  0.500  0.135  0.814  1.0
  O  O10  1  0.500  0.635  0.686  1.0
  O  O11  1  0.500  0.365  0.314  1.0
  O  O12  1  0.000  0.313  0.599  1.0
  O  O13  1  0.000  0.687  0.401  1.0
  O  O14  1  0.500  0.865  0.186  1.0
  O  O15  1  0.000  0.187  0.099  1.0
  O  O16  1  0.500  0.000  0.500  1.0
  O  O17  1  0.000  0.813  0.901  1.0
[/CIF]
.