The material described by Ag2Cr2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form corner-sharing CrO4 tetrahedra. In the second Cr site, Cr(2) is bonded to one O(1), one O(4), one O(5), and one O(6) atom to form corner-sharing CrO4 tetrahedra. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(6), and two equivalent O(2) atoms. In the second Ag site, Ag(2) is bonded in a 7-coordinate geometry to one O(3), one O(5), one O(6), two equivalent O(1), and two equivalent O(7) atoms. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cr(2), one Ag(1), and two equivalent Ag(2) atoms. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Cr(1) and two equivalent Ag(1) atoms. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cr(1), one Ag(1), and one Ag(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Cr(1), one Cr(2), and one Ag(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Cr(2) and one Ag(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Cr(2), one Ag(1), and one Ag(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Cr(1) and two equivalent Ag(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Cr2Ag2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.632
_cell_length_b   6.998
_cell_length_c   7.197
_cell_angle_alpha   92.029
_cell_angle_beta   111.454
_cell_angle_gamma   94.963
_symmetry_Int_Tables_number   1
_cell_volume   308.878
_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
  Cr  Cr0  1  0.760  0.663  0.984  1.0
  Cr  Cr1  1  0.240  0.337  0.016  1.0
  Cr  Cr2  1  0.200  0.845  0.312  1.0
  Cr  Cr3  1  0.800  0.155  0.688  1.0
  Ag  Ag4  1  0.753  0.153  0.184  1.0
  Ag  Ag5  1  0.732  0.634  0.455  1.0
  Ag  Ag6  1  0.247  0.847  0.816  1.0
  Ag  Ag7  1  0.268  0.366  0.545  1.0
  O  O8  1  0.844  0.296  0.522  1.0
  O  O9  1  0.632  0.852  0.000  1.0
  O  O10  1  0.266  0.493  0.856  1.0
  O  O11  1  0.043  0.746  0.062  1.0
  O  O12  1  0.546  0.137  0.667  1.0
  O  O13  1  0.887  0.945  0.666  1.0
  O  O14  1  0.675  0.570  0.754  1.0
  O  O15  1  0.368  0.148  1.000  1.0
  O  O16  1  0.734  0.507  0.144  1.0
  O  O17  1  0.113  0.055  0.334  1.0
  O  O18  1  0.454  0.863  0.333  1.0
  O  O19  1  0.957  0.254  0.938  1.0
  O  O20  1  0.156  0.704  0.478  1.0
  O  O21  1  0.325  0.430  0.246  1.0
[/CIF]
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The material described by Ag2Cr2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form corner-sharing CrO4 tetrahedra. In the second Cr site, Cr(2) is bonded to one O(1), one O(4), one O(5), and one O(6) atom to form corner-sharing CrO4 tetrahedra. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(6), and two equivalent O(2) atoms. In the second Ag site, Ag(2) is bonded in a 7-coordinate geometry to one O(3), one O(5), one O(6), two equivalent O(1), and two equivalent O(7) atoms. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cr(2), one Ag(1), and two equivalent Ag(2) atoms. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Cr(1) and two equivalent Ag(1) atoms. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cr(1), one Ag(1), and one Ag(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Cr(1), one Cr(2), and one Ag(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Cr(2) and one Ag(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Cr(2), one Ag(1), and one Ag(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Cr(1) and two equivalent Ag(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Cr2Ag2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.632
_cell_length_b   6.998
_cell_length_c   7.197
_cell_angle_alpha   92.029
_cell_angle_beta   111.454
_cell_angle_gamma   94.963
_symmetry_Int_Tables_number   1
_cell_volume   308.878
_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
  Cr  Cr0  1  0.760  0.663  0.984  1.0
  Cr  Cr1  1  0.240  0.337  0.016  1.0
  Cr  Cr2  1  0.200  0.845  0.312  1.0
  Cr  Cr3  1  0.800  0.155  0.688  1.0
  Ag  Ag4  1  0.753  0.153  0.184  1.0
  Ag  Ag5  1  0.732  0.634  0.455  1.0
  Ag  Ag6  1  0.247  0.847  0.816  1.0
  Ag  Ag7  1  0.268  0.366  0.545  1.0
  O  O8  1  0.844  0.296  0.522  1.0
  O  O9  1  0.632  0.852  0.000  1.0
  O  O10  1  0.266  0.493  0.856  1.0
  O  O11  1  0.043  0.746  0.062  1.0
  O  O12  1  0.546  0.137  0.667  1.0
  O  O13  1  0.887  0.945  0.666  1.0
  O  O14  1  0.675  0.570  0.754  1.0
  O  O15  1  0.368  0.148  1.000  1.0
  O  O16  1  0.734  0.507  0.144  1.0
  O  O17  1  0.113  0.055  0.334  1.0
  O  O18  1  0.454  0.863  0.333  1.0
  O  O19  1  0.957  0.254  0.938  1.0
  O  O20  1  0.156  0.704  0.478  1.0
  O  O21  1  0.325  0.430  0.246  1.0
[/CIF]
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