The material described by Cr2Pb3(PO4)4 crystallizes in the monoclinic P2_1/c space group. Cr(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form CrO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 4-coordinate geometry to one O(3), one O(4), one O(7), and one O(8) atom. In the second Pb site, Pb(2) is bonded in a body-centered cubic geometry to two equivalent O(2), two equivalent O(5), two equivalent O(7), and two equivalent O(8) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(4), one O(6), and one O(8) atom to form PO4 tetrahedra that share corners with three equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-44°. In the second P site, P(2) is bonded to one O(1), one O(2), one O(5), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 38-46°. There are eight inequivalent O sites. In the first O site, O(5) is bonded in a 2-coordinate geometry to one Cr(1), one Pb(2), and one P(2) atom. In the second O site, O(6) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(1) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to one Pb(1), one Pb(2), and one P(2) atom. In the fourth O site, O(8) is bonded in a distorted single-bond geometry to one Pb(1), one Pb(2), and one P(1) atom. In the fifth O site, O(1) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(2) atom. In the sixth O site, O(2) is bonded in a 2-coordinate geometry to one Cr(1), one Pb(2), and one P(2) atom. In the seventh O site, O(3) is bonded in a 2-coordinate geometry to one Cr(1), one Pb(1), and one P(1) atom. In the eighth O site, O(4) is bonded in a 3-coordinate geometry to one Cr(1), one Pb(1), and one P(1) atom. is represented by the CIF file [CIF]
data_Cr2P4Pb3O16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.937
_cell_length_b   8.971
_cell_length_c   9.267
_cell_angle_alpha   90.000
_cell_angle_beta   116.764
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   663.401
_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  0.248  0.869  0.744  1.0
  Cr  Cr1  1  0.752  0.369  0.756  1.0
  Cr  Cr2  1  0.752  0.131  0.256  1.0
  Cr  Cr3  1  0.248  0.631  0.244  1.0
  P  P4  1  0.575  0.411  0.359  1.0
  P  P5  1  0.425  0.911  0.141  1.0
  P  P6  1  0.425  0.589  0.641  1.0
  P  P7  1  0.575  0.089  0.859  1.0
  P  P8  1  0.981  0.362  0.156  1.0
  P  P9  1  0.019  0.862  0.344  1.0
  P  P10  1  0.019  0.638  0.844  1.0
  P  P11  1  0.981  0.138  0.656  1.0
  Pb  Pb12  1  0.299  0.293  0.027  1.0
  Pb  Pb13  1  0.701  0.793  0.473  1.0
  Pb  Pb14  1  0.701  0.707  0.973  1.0
  Pb  Pb15  1  0.299  0.207  0.527  1.0
  Pb  Pb16  1  0.000  0.000  0.000  1.0
  Pb  Pb17  1  0.000  0.500  0.500  1.0
  O  O18  1  0.156  0.910  0.508  1.0
  O  O19  1  0.844  0.410  0.992  1.0
  O  O20  1  0.844  0.090  0.492  1.0
  O  O21  1  0.156  0.590  0.008  1.0
  O  O22  1  0.094  0.794  0.237  1.0
  O  O23  1  0.906  0.294  0.263  1.0
  O  O24  1  0.906  0.206  0.763  1.0
  O  O25  1  0.094  0.706  0.737  1.0
  O  O26  1  0.591  0.283  0.256  1.0
  O  O27  1  0.409  0.783  0.244  1.0
  O  O28  1  0.409  0.717  0.744  1.0
  O  O29  1  0.591  0.217  0.756  1.0
  O  O30  1  0.388  0.454  0.259  1.0
  O  O31  1  0.612  0.954  0.241  1.0
  O  O32  1  0.612  0.546  0.741  1.0
  O  O33  1  0.388  0.046  0.759  1.0
  O  O34  1  0.080  0.004  0.757  1.0
  O  O35  1  0.920  0.504  0.743  1.0
  O  O36  1  0.920  0.996  0.243  1.0
  O  O37  1  0.080  0.496  0.257  1.0
  O  O38  1  0.391  0.850  0.976  1.0
  O  O39  1  0.609  0.350  0.524  1.0
  O  O40  1  0.609  0.150  0.024  1.0
  O  O41  1  0.391  0.650  0.476  1.0
  O  O42  1  0.101  0.252  0.135  1.0
  O  O43  1  0.899  0.752  0.365  1.0
  O  O44  1  0.899  0.748  0.865  1.0
  O  O45  1  0.101  0.248  0.635  1.0
  O  O46  1  0.313  0.043  0.129  1.0
  O  O47  1  0.687  0.543  0.371  1.0
  O  O48  1  0.687  0.957  0.871  1.0
  O  O49  1  0.313  0.457  0.629  1.0
[/CIF]
.
The material described by Cr2Pb3(PO4)4 crystallizes in the monoclinic P2_1/c space group. Cr(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form CrO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 4-coordinate geometry to one O(3), one O(4), one O(7), and one O(8) atom. In the second Pb site, Pb(2) is bonded in a body-centered cubic geometry to two equivalent O(2), two equivalent O(5), two equivalent O(7), and two equivalent O(8) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(4), one O(6), and one O(8) atom to form PO4 tetrahedra that share corners with three equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-44°. In the second P site, P(2) is bonded to one O(1), one O(2), one O(5), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 38-46°. There are eight inequivalent O sites. In the first O site, O(5) is bonded in a 2-coordinate geometry to one Cr(1), one Pb(2), and one P(2) atom. In the second O site, O(6) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(1) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to one Pb(1), one Pb(2), and one P(2) atom. In the fourth O site, O(8) is bonded in a distorted single-bond geometry to one Pb(1), one Pb(2), and one P(1) atom. In the fifth O site, O(1) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(2) atom. In the sixth O site, O(2) is bonded in a 2-coordinate geometry to one Cr(1), one Pb(2), and one P(2) atom. In the seventh O site, O(3) is bonded in a 2-coordinate geometry to one Cr(1), one Pb(1), and one P(1) atom. In the eighth O site, O(4) is bonded in a 3-coordinate geometry to one Cr(1), one Pb(1), and one P(1) atom. is represented by the CIF file [CIF]
data_Cr2P4Pb3O16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.937
_cell_length_b   8.971
_cell_length_c   9.267
_cell_angle_alpha   90.000
_cell_angle_beta   116.764
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   663.401
_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  0.248  0.869  0.744  1.0
  Cr  Cr1  1  0.752  0.369  0.756  1.0
  Cr  Cr2  1  0.752  0.131  0.256  1.0
  Cr  Cr3  1  0.248  0.631  0.244  1.0
  P  P4  1  0.575  0.411  0.359  1.0
  P  P5  1  0.425  0.911  0.141  1.0
  P  P6  1  0.425  0.589  0.641  1.0
  P  P7  1  0.575  0.089  0.859  1.0
  P  P8  1  0.981  0.362  0.156  1.0
  P  P9  1  0.019  0.862  0.344  1.0
  P  P10  1  0.019  0.638  0.844  1.0
  P  P11  1  0.981  0.138  0.656  1.0
  Pb  Pb12  1  0.299  0.293  0.027  1.0
  Pb  Pb13  1  0.701  0.793  0.473  1.0
  Pb  Pb14  1  0.701  0.707  0.973  1.0
  Pb  Pb15  1  0.299  0.207  0.527  1.0
  Pb  Pb16  1  0.000  0.000  0.000  1.0
  Pb  Pb17  1  0.000  0.500  0.500  1.0
  O  O18  1  0.156  0.910  0.508  1.0
  O  O19  1  0.844  0.410  0.992  1.0
  O  O20  1  0.844  0.090  0.492  1.0
  O  O21  1  0.156  0.590  0.008  1.0
  O  O22  1  0.094  0.794  0.237  1.0
  O  O23  1  0.906  0.294  0.263  1.0
  O  O24  1  0.906  0.206  0.763  1.0
  O  O25  1  0.094  0.706  0.737  1.0
  O  O26  1  0.591  0.283  0.256  1.0
  O  O27  1  0.409  0.783  0.244  1.0
  O  O28  1  0.409  0.717  0.744  1.0
  O  O29  1  0.591  0.217  0.756  1.0
  O  O30  1  0.388  0.454  0.259  1.0
  O  O31  1  0.612  0.954  0.241  1.0
  O  O32  1  0.612  0.546  0.741  1.0
  O  O33  1  0.388  0.046  0.759  1.0
  O  O34  1  0.080  0.004  0.757  1.0
  O  O35  1  0.920  0.504  0.743  1.0
  O  O36  1  0.920  0.996  0.243  1.0
  O  O37  1  0.080  0.496  0.257  1.0
  O  O38  1  0.391  0.850  0.976  1.0
  O  O39  1  0.609  0.350  0.524  1.0
  O  O40  1  0.609  0.150  0.024  1.0
  O  O41  1  0.391  0.650  0.476  1.0
  O  O42  1  0.101  0.252  0.135  1.0
  O  O43  1  0.899  0.752  0.365  1.0
  O  O44  1  0.899  0.748  0.865  1.0
  O  O45  1  0.101  0.248  0.635  1.0
  O  O46  1  0.313  0.043  0.129  1.0
  O  O47  1  0.687  0.543  0.371  1.0
  O  O48  1  0.687  0.957  0.871  1.0
  O  O49  1  0.313  0.457  0.629  1.0
[/CIF]
.