The material structure described by SrCr2O4 crystallizes in the orthorhombic Pmmn space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(3) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(3) atoms. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form edge-sharing CrO6 octahedra. In the second Cr site, Cr(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form edge-sharing CrO6 octahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Cr(1), and two equivalent Cr(2) atoms to form distorted OSrCr3 trigonal pyramids that share corners with four equivalent O(3)Sr2Cr3 trigonal bipyramids, corners with three equivalent O(1)SrCr3 trigonal pyramids, corners with three equivalent O(2)SrCr3 trigonal pyramids, edges with four equivalent O(3)Sr2Cr3 trigonal bipyramids, and  an edgeedge with one O(2)SrCr3 trigonal pyramid. In the second O site, O(2) is bonded to one Sr(2), one Cr(1), and two equivalent Cr(2) atoms to form OSrCr3 trigonal pyramids that share corners with four equivalent O(3)Sr2Cr3 trigonal bipyramids, corners with three equivalent O(1)SrCr3 trigonal pyramids, corners with three equivalent O(2)SrCr3 trigonal pyramids, edges with four equivalent O(3)Sr2Cr3 trigonal bipyramids, and  an edgeedge with one O(1)SrCr3 trigonal pyramid. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Cr(2), and two equivalent Cr(1) atoms to form OSr2Cr3 trigonal bipyramids that share corners with five equivalent O(3)Sr2Cr3 trigonal bipyramids, corners with two equivalent O(1)SrCr3 trigonal pyramids, corners with two equivalent O(2)SrCr3 trigonal pyramids, edges with four equivalent O(3)Sr2Cr3 trigonal bipyramids, edges with two equivalent O(1)SrCr3 trigonal pyramids, and edges with two equivalent O(2)SrCr3 trigonal pyramids. is represented by the CIF card [CIF]
data_SrCr2O4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.147
_cell_length_b   5.931
_cell_length_c   11.603
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   354.224
_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  0.859  0.250  0.750  1.0
  Sr  Sr1  1  0.141  0.750  0.250  1.0
  Sr  Sr2  1  0.545  0.250  0.250  1.0
  Sr  Sr3  1  0.455  0.750  0.750  1.0
  Cr  Cr4  1  0.504  0.750  0.007  1.0
  Cr  Cr5  1  0.496  0.250  0.993  1.0
  Cr  Cr6  1  0.000  0.500  0.500  1.0
  Cr  Cr7  1  0.000  0.000  0.500  1.0
  Cr  Cr8  1  0.504  0.750  0.493  1.0
  Cr  Cr9  1  0.496  0.250  0.507  1.0
  Cr  Cr10  1  1.000  0.000  0.000  1.0
  Cr  Cr11  1  1.000  0.500  0.000  1.0
  O  O12  1  0.836  0.750  0.409  1.0
  O  O13  1  0.836  0.750  0.091  1.0
  O  O14  1  0.164  0.250  0.591  1.0
  O  O15  1  0.164  0.250  0.909  1.0
  O  O16  1  0.172  0.750  0.584  1.0
  O  O17  1  0.172  0.750  0.916  1.0
  O  O18  1  0.828  0.250  0.416  1.0
  O  O19  1  0.828  0.250  0.084  1.0
  O  O20  1  0.665  0.503  0.593  1.0
  O  O21  1  0.665  0.997  0.907  1.0
  O  O22  1  0.335  0.003  0.407  1.0
  O  O23  1  0.335  0.497  0.093  1.0
  O  O24  1  0.335  0.497  0.407  1.0
  O  O25  1  0.335  0.003  0.093  1.0
  O  O26  1  0.665  0.997  0.593  1.0
  O  O27  1  0.665  0.503  0.907  1.0
[/CIF]
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The material structure described by SrCr2O4 crystallizes in the orthorhombic Pmmn space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(3) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(3) atoms. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form edge-sharing CrO6 octahedra. In the second Cr site, Cr(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form edge-sharing CrO6 octahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Cr(1), and two equivalent Cr(2) atoms to form distorted OSrCr3 trigonal pyramids that share corners with four equivalent O(3)Sr2Cr3 trigonal bipyramids, corners with three equivalent O(1)SrCr3 trigonal pyramids, corners with three equivalent O(2)SrCr3 trigonal pyramids, edges with four equivalent O(3)Sr2Cr3 trigonal bipyramids, and  an edgeedge with one O(2)SrCr3 trigonal pyramid. In the second O site, O(2) is bonded to one Sr(2), one Cr(1), and two equivalent Cr(2) atoms to form OSrCr3 trigonal pyramids that share corners with four equivalent O(3)Sr2Cr3 trigonal bipyramids, corners with three equivalent O(1)SrCr3 trigonal pyramids, corners with three equivalent O(2)SrCr3 trigonal pyramids, edges with four equivalent O(3)Sr2Cr3 trigonal bipyramids, and  an edgeedge with one O(1)SrCr3 trigonal pyramid. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Cr(2), and two equivalent Cr(1) atoms to form OSr2Cr3 trigonal bipyramids that share corners with five equivalent O(3)Sr2Cr3 trigonal bipyramids, corners with two equivalent O(1)SrCr3 trigonal pyramids, corners with two equivalent O(2)SrCr3 trigonal pyramids, edges with four equivalent O(3)Sr2Cr3 trigonal bipyramids, edges with two equivalent O(1)SrCr3 trigonal pyramids, and edges with two equivalent O(2)SrCr3 trigonal pyramids. is represented by the CIF card [CIF]
data_SrCr2O4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.147
_cell_length_b   5.931
_cell_length_c   11.603
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   354.224
_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  0.859  0.250  0.750  1.0
  Sr  Sr1  1  0.141  0.750  0.250  1.0
  Sr  Sr2  1  0.545  0.250  0.250  1.0
  Sr  Sr3  1  0.455  0.750  0.750  1.0
  Cr  Cr4  1  0.504  0.750  0.007  1.0
  Cr  Cr5  1  0.496  0.250  0.993  1.0
  Cr  Cr6  1  0.000  0.500  0.500  1.0
  Cr  Cr7  1  0.000  0.000  0.500  1.0
  Cr  Cr8  1  0.504  0.750  0.493  1.0
  Cr  Cr9  1  0.496  0.250  0.507  1.0
  Cr  Cr10  1  1.000  0.000  0.000  1.0
  Cr  Cr11  1  1.000  0.500  0.000  1.0
  O  O12  1  0.836  0.750  0.409  1.0
  O  O13  1  0.836  0.750  0.091  1.0
  O  O14  1  0.164  0.250  0.591  1.0
  O  O15  1  0.164  0.250  0.909  1.0
  O  O16  1  0.172  0.750  0.584  1.0
  O  O17  1  0.172  0.750  0.916  1.0
  O  O18  1  0.828  0.250  0.416  1.0
  O  O19  1  0.828  0.250  0.084  1.0
  O  O20  1  0.665  0.503  0.593  1.0
  O  O21  1  0.665  0.997  0.907  1.0
  O  O22  1  0.335  0.003  0.407  1.0
  O  O23  1  0.335  0.497  0.093  1.0
  O  O24  1  0.335  0.497  0.407  1.0
  O  O25  1  0.335  0.003  0.093  1.0
  O  O26  1  0.665  0.997  0.593  1.0
  O  O27  1  0.665  0.503  0.907  1.0
[/CIF]
.