The crystal structure described by FeCoBi2(AsO6)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(10), two equivalent O(11), and two equivalent O(8) atoms to form FeO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra, and edges with two equivalent Co(2)O6 octahedra. In the second Fe site, Fe(2) is bonded to two equivalent O(1), two equivalent O(12), and two equivalent O(6) atoms to form FeO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra, and edges with two equivalent Co(1)O6 octahedra. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form CoO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra, and edges with two equivalent Fe(2)O6 octahedra. In the second Co site, Co(2) is bonded to two equivalent O(11), two equivalent O(7), and two equivalent O(8) atoms to form CoO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra, and edges with two equivalent Fe(1)O6 octahedra. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to one O(10), one O(5), one O(7), one O(9), and two equivalent O(2) atoms. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(12), one O(2), one O(3), one O(4), and two equivalent O(5) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(10), one O(7), and one O(9) atom to form AsO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, and  a cornercorner with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-63°. In the second As site, As(2) is bonded to one O(12), one O(3), one O(4), and one O(8) atom to form AsO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, and  a cornercorner with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-62°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Fe(2), one Co(1), and one As(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Bi(2) and two equivalent Bi(1) atoms. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Bi(2) and one As(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Co(1), one Bi(2), and one As(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Bi(1) and two equivalent Bi(2) atoms. In the sixth O site, O(6) is bonded in a water-like geometry to one Fe(2) and one Co(1) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Co(2), one Bi(1), and one As(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Fe(1), one Co(2), and one As(2) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Bi(1) and one As(1) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Fe(1), one Bi(1), and one As(1) atom. In the eleventh O site, O(11) is bonded in a distorted water-like geometry to one Fe(1) and one Co(2) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Fe(2), one Bi(2), and one As(2) atom. is represented by the CIF card [CIF]
data_FeCoBi2(AsO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.550
_cell_length_b   6.189
_cell_length_c   8.921
_cell_angle_alpha   96.543
_cell_angle_beta   100.248
_cell_angle_gamma   92.706
_symmetry_Int_Tables_number   1
_cell_volume   244.984
_cell_formula_units_Z   1
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
  As  As0  1  0.535  0.794  0.219  1.0
  As  As1  1  0.465  0.206  0.781  1.0
  Bi  Bi2  1  0.793  0.682  0.608  1.0
  Bi  Bi3  1  0.207  0.318  0.392  1.0
  Co  Co4  1  1.000  0.500  1.000  1.0
  Fe  Fe5  1  0.000  0.000  0.000  1.0
  O  O6  1  0.768  0.766  0.086  1.0
  O  O7  1  0.232  0.234  0.914  1.0
  O  O8  1  0.717  0.380  0.451  1.0
  O  O9  1  0.283  0.620  0.549  1.0
  O  O10  1  0.749  0.860  0.396  1.0
  O  O11  1  0.251  0.140  0.604  1.0
  O  O12  1  0.305  0.556  0.191  1.0
  O  O13  1  0.695  0.444  0.809  1.0
  O  O14  1  0.137  0.727  0.912  1.0
  O  O15  1  0.863  0.273  0.088  1.0
  O  O16  1  0.324  0.015  0.186  1.0
  O  O17  1  0.676  0.985  0.814  1.0
[/CIF]
.
The crystal structure described by FeCoBi2(AsO6)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(10), two equivalent O(11), and two equivalent O(8) atoms to form FeO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra, and edges with two equivalent Co(2)O6 octahedra. In the second Fe site, Fe(2) is bonded to two equivalent O(1), two equivalent O(12), and two equivalent O(6) atoms to form FeO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra, and edges with two equivalent Co(1)O6 octahedra. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form CoO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra, and edges with two equivalent Fe(2)O6 octahedra. In the second Co site, Co(2) is bonded to two equivalent O(11), two equivalent O(7), and two equivalent O(8) atoms to form CoO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra, and edges with two equivalent Fe(1)O6 octahedra. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to one O(10), one O(5), one O(7), one O(9), and two equivalent O(2) atoms. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(12), one O(2), one O(3), one O(4), and two equivalent O(5) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(10), one O(7), and one O(9) atom to form AsO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, and  a cornercorner with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-63°. In the second As site, As(2) is bonded to one O(12), one O(3), one O(4), and one O(8) atom to form AsO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Co(1)O6 octahedra, and  a cornercorner with one Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-62°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Fe(2), one Co(1), and one As(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Bi(2) and two equivalent Bi(1) atoms. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Bi(2) and one As(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Co(1), one Bi(2), and one As(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Bi(1) and two equivalent Bi(2) atoms. In the sixth O site, O(6) is bonded in a water-like geometry to one Fe(2) and one Co(1) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Co(2), one Bi(1), and one As(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Fe(1), one Co(2), and one As(2) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Bi(1) and one As(1) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Fe(1), one Bi(1), and one As(1) atom. In the eleventh O site, O(11) is bonded in a distorted water-like geometry to one Fe(1) and one Co(2) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Fe(2), one Bi(2), and one As(2) atom. is represented by the CIF card [CIF]
data_FeCoBi2(AsO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.550
_cell_length_b   6.189
_cell_length_c   8.921
_cell_angle_alpha   96.543
_cell_angle_beta   100.248
_cell_angle_gamma   92.706
_symmetry_Int_Tables_number   1
_cell_volume   244.984
_cell_formula_units_Z   1
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
  As  As0  1  0.535  0.794  0.219  1.0
  As  As1  1  0.465  0.206  0.781  1.0
  Bi  Bi2  1  0.793  0.682  0.608  1.0
  Bi  Bi3  1  0.207  0.318  0.392  1.0
  Co  Co4  1  1.000  0.500  1.000  1.0
  Fe  Fe5  1  0.000  0.000  0.000  1.0
  O  O6  1  0.768  0.766  0.086  1.0
  O  O7  1  0.232  0.234  0.914  1.0
  O  O8  1  0.717  0.380  0.451  1.0
  O  O9  1  0.283  0.620  0.549  1.0
  O  O10  1  0.749  0.860  0.396  1.0
  O  O11  1  0.251  0.140  0.604  1.0
  O  O12  1  0.305  0.556  0.191  1.0
  O  O13  1  0.695  0.444  0.809  1.0
  O  O14  1  0.137  0.727  0.912  1.0
  O  O15  1  0.863  0.273  0.088  1.0
  O  O16  1  0.324  0.015  0.186  1.0
  O  O17  1  0.676  0.985  0.814  1.0
[/CIF]
.