The structure described by SrCrP2O7 crystallizes in the monoclinic Pc space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(13), one O(14), one O(3), one O(5), one O(6), and one O(9) atom. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(10), one O(12), one O(13), one O(14), one O(2), one O(4), one O(5), and one O(6) atom. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(12), one O(13), one O(3), and one O(9) atom to form distorted CrO5 trigonal bipyramids that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent P(1)O4 tetrahedra. In the second Cr site, Cr(2) is bonded to one O(10), one O(11), one O(14), one O(2), and one O(4) atom to form distorted CrO5 trigonal bipyramids that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(11), one O(3), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one Cr(2)O5 trigonal bipyramid, and corners with two equivalent Cr(1)O5 trigonal bipyramids. In the second P site, P(2) is bonded to one O(12), one O(2), one O(4), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one Cr(1)O5 trigonal bipyramid, and corners with two equivalent Cr(2)O5 trigonal bipyramids. In the third P site, P(3) is bonded to one O(14), one O(6), one O(8), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one Cr(1)O5 trigonal bipyramid, and  a cornercorner with one Cr(2)O5 trigonal bipyramid. In the fourth P site, P(4) is bonded to one O(10), one O(13), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one Cr(1)O5 trigonal bipyramid, and  a cornercorner with one Cr(2)O5 trigonal bipyramid. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Sr(1), one Cr(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Sr(2), one Cr(2), and one P(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Sr(1), one Cr(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Sr(2), one Cr(2), and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), and one P(4) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), and one P(3) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one P(1) and one P(4) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one P(2) and one P(3) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Sr(1), one Cr(1), and one P(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Sr(2), one Cr(2), and one P(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Sr(1), one Cr(2), and one P(1) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Sr(2), one Cr(1), and one P(2) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Cr(1), and one P(4) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Cr(2), and one P(3) atom. is represented by the CIF card [CIF]
data_SrCrP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.438
_cell_length_b   5.495
_cell_length_c   13.854
_cell_angle_alpha   67.062
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   591.563
_cell_formula_units_Z   4
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
  Sr  Sr0  1  0.410  0.988  0.222  1.0
  Sr  Sr1  1  0.914  0.009  0.276  1.0
  Sr  Sr2  1  0.086  0.009  0.776  1.0
  Sr  Sr3  1  0.590  0.988  0.722  1.0
  Cr  Cr4  1  0.396  0.318  0.891  1.0
  Cr  Cr5  1  0.104  0.679  0.110  1.0
  Cr  Cr6  1  0.896  0.679  0.610  1.0
  Cr  Cr7  1  0.604  0.318  0.391  1.0
  P  P8  1  0.552  0.670  0.516  1.0
  P  P9  1  0.051  0.328  0.984  1.0
  P  P10  1  0.949  0.328  0.484  1.0
  P  P11  1  0.448  0.670  0.016  1.0
  P  P12  1  0.212  0.411  0.336  1.0
  P  P13  1  0.788  0.411  0.836  1.0
  P  P14  1  0.290  0.592  0.663  1.0
  P  P15  1  0.710  0.592  0.163  1.0
  O  O16  1  0.563  0.874  0.405  1.0
  O  O17  1  0.062  0.125  0.096  1.0
  O  O18  1  0.938  0.125  0.596  1.0
  O  O19  1  0.437  0.874  0.905  1.0
  O  O20  1  0.415  0.382  0.030  1.0
  O  O21  1  0.918  0.616  0.471  1.0
  O  O22  1  0.082  0.616  0.971  1.0
  O  O23  1  0.585  0.382  0.530  1.0
  O  O24  1  0.689  0.816  0.201  1.0
  O  O25  1  0.190  0.193  0.295  1.0
  O  O26  1  0.810  0.193  0.795  1.0
  O  O27  1  0.311  0.816  0.701  1.0
  O  O28  1  0.633  0.682  0.048  1.0
  O  O29  1  0.133  0.315  0.451  1.0
  O  O30  1  0.867  0.315  0.951  1.0
  O  O31  1  0.367  0.682  0.548  1.0
  O  O32  1  0.616  0.475  0.851  1.0
  O  O33  1  0.118  0.524  0.651  1.0
  O  O34  1  0.882  0.524  0.151  1.0
  O  O35  1  0.384  0.475  0.351  1.0
  O  O36  1  0.651  0.741  0.596  1.0
  O  O37  1  0.152  0.253  0.906  1.0
  O  O38  1  0.624  0.335  0.235  1.0
  O  O39  1  0.349  0.741  0.096  1.0
  O  O40  1  0.376  0.335  0.735  1.0
  O  O41  1  0.870  0.672  0.765  1.0
  O  O42  1  0.130  0.672  0.265  1.0
  O  O43  1  0.848  0.253  0.406  1.0
[/CIF]
.
The structure described by SrCrP2O7 crystallizes in the monoclinic Pc space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(13), one O(14), one O(3), one O(5), one O(6), and one O(9) atom. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(10), one O(12), one O(13), one O(14), one O(2), one O(4), one O(5), and one O(6) atom. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(12), one O(13), one O(3), and one O(9) atom to form distorted CrO5 trigonal bipyramids that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent P(1)O4 tetrahedra. In the second Cr site, Cr(2) is bonded to one O(10), one O(11), one O(14), one O(2), and one O(4) atom to form distorted CrO5 trigonal bipyramids that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(11), one O(3), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one Cr(2)O5 trigonal bipyramid, and corners with two equivalent Cr(1)O5 trigonal bipyramids. In the second P site, P(2) is bonded to one O(12), one O(2), one O(4), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one Cr(1)O5 trigonal bipyramid, and corners with two equivalent Cr(2)O5 trigonal bipyramids. In the third P site, P(3) is bonded to one O(14), one O(6), one O(8), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one Cr(1)O5 trigonal bipyramid, and  a cornercorner with one Cr(2)O5 trigonal bipyramid. In the fourth P site, P(4) is bonded to one O(10), one O(13), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one Cr(1)O5 trigonal bipyramid, and  a cornercorner with one Cr(2)O5 trigonal bipyramid. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Sr(1), one Cr(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Sr(2), one Cr(2), and one P(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Sr(1), one Cr(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Sr(2), one Cr(2), and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), and one P(4) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), and one P(3) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one P(1) and one P(4) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one P(2) and one P(3) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Sr(1), one Cr(1), and one P(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Sr(2), one Cr(2), and one P(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Sr(1), one Cr(2), and one P(1) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Sr(2), one Cr(1), and one P(2) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Cr(1), and one P(4) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Cr(2), and one P(3) atom. is represented by the CIF card [CIF]
data_SrCrP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.438
_cell_length_b   5.495
_cell_length_c   13.854
_cell_angle_alpha   67.062
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   591.563
_cell_formula_units_Z   4
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
  Sr  Sr0  1  0.410  0.988  0.222  1.0
  Sr  Sr1  1  0.914  0.009  0.276  1.0
  Sr  Sr2  1  0.086  0.009  0.776  1.0
  Sr  Sr3  1  0.590  0.988  0.722  1.0
  Cr  Cr4  1  0.396  0.318  0.891  1.0
  Cr  Cr5  1  0.104  0.679  0.110  1.0
  Cr  Cr6  1  0.896  0.679  0.610  1.0
  Cr  Cr7  1  0.604  0.318  0.391  1.0
  P  P8  1  0.552  0.670  0.516  1.0
  P  P9  1  0.051  0.328  0.984  1.0
  P  P10  1  0.949  0.328  0.484  1.0
  P  P11  1  0.448  0.670  0.016  1.0
  P  P12  1  0.212  0.411  0.336  1.0
  P  P13  1  0.788  0.411  0.836  1.0
  P  P14  1  0.290  0.592  0.663  1.0
  P  P15  1  0.710  0.592  0.163  1.0
  O  O16  1  0.563  0.874  0.405  1.0
  O  O17  1  0.062  0.125  0.096  1.0
  O  O18  1  0.938  0.125  0.596  1.0
  O  O19  1  0.437  0.874  0.905  1.0
  O  O20  1  0.415  0.382  0.030  1.0
  O  O21  1  0.918  0.616  0.471  1.0
  O  O22  1  0.082  0.616  0.971  1.0
  O  O23  1  0.585  0.382  0.530  1.0
  O  O24  1  0.689  0.816  0.201  1.0
  O  O25  1  0.190  0.193  0.295  1.0
  O  O26  1  0.810  0.193  0.795  1.0
  O  O27  1  0.311  0.816  0.701  1.0
  O  O28  1  0.633  0.682  0.048  1.0
  O  O29  1  0.133  0.315  0.451  1.0
  O  O30  1  0.867  0.315  0.951  1.0
  O  O31  1  0.367  0.682  0.548  1.0
  O  O32  1  0.616  0.475  0.851  1.0
  O  O33  1  0.118  0.524  0.651  1.0
  O  O34  1  0.882  0.524  0.151  1.0
  O  O35  1  0.384  0.475  0.351  1.0
  O  O36  1  0.651  0.741  0.596  1.0
  O  O37  1  0.152  0.253  0.906  1.0
  O  O38  1  0.624  0.335  0.235  1.0
  O  O39  1  0.349  0.741  0.096  1.0
  O  O40  1  0.376  0.335  0.735  1.0
  O  O41  1  0.870  0.672  0.765  1.0
  O  O42  1  0.130  0.672  0.265  1.0
  O  O43  1  0.848  0.253  0.406  1.0
[/CIF]
.