The material structure described by Sm2Cu2O5 crystallizes in the orthorhombic Pbam space group. Sm(1) is bonded in a 9-coordinate geometry to two equivalent O(1), three equivalent O(3), and four equivalent O(2) atoms. Cu(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted corner-sharing CuO5 square pyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Sm(1) and two equivalent Cu(1) atoms to form OSm4Cu2 octahedra that share corners with four equivalent O(3)Sm3Cu2 square pyramids, edges with two equivalent O(1)Sm4Cu2 octahedra, and faces with four equivalent O(3)Sm3Cu2 square pyramids. In the second O site, O(2) is bonded in a 6-coordinate geometry to four equivalent Sm(1) and two equivalent Cu(1) atoms. In the third O site, O(3) is bonded to three equivalent Sm(1) and two equivalent Cu(1) atoms to form distorted OSm3Cu2 square pyramids that share corners with two equivalent O(1)Sm4Cu2 octahedra, corners with six equivalent O(3)Sm3Cu2 square pyramids,  an edgeedge with one O(3)Sm3Cu2 square pyramid, and faces with two equivalent O(1)Sm4Cu2 octahedra. The corner-sharing octahedral tilt angles are 50°. is represented by the CIF file [CIF]
data_Sm2Cu2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.767
_cell_length_b   5.790
_cell_length_c   9.892
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   215.721
_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
  Sm  Sm0  1  0.500  0.144  0.850  1.0
  Sm  Sm1  1  0.500  0.356  0.350  1.0
  Sm  Sm2  1  0.500  0.644  0.650  1.0
  Sm  Sm3  1  0.500  0.856  0.150  1.0
  Cu  Cu4  1  0.000  0.189  0.593  1.0
  Cu  Cu5  1  0.000  0.311  0.093  1.0
  Cu  Cu6  1  0.000  0.689  0.907  1.0
  Cu  Cu7  1  0.000  0.811  0.407  1.0
  O  O8  1  0.000  0.000  0.000  1.0
  O  O9  1  0.000  0.099  0.301  1.0
  O  O10  1  0.500  0.234  0.602  1.0
  O  O11  1  0.500  0.266  0.102  1.0
  O  O12  1  0.000  0.401  0.801  1.0
  O  O13  1  0.000  0.500  0.500  1.0
  O  O14  1  0.000  0.599  0.199  1.0
  O  O15  1  0.500  0.734  0.898  1.0
  O  O16  1  0.500  0.766  0.398  1.0
  O  O17  1  0.000  0.901  0.699  1.0
[/CIF]
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The material structure described by Sm2Cu2O5 crystallizes in the orthorhombic Pbam space group. Sm(1) is bonded in a 9-coordinate geometry to two equivalent O(1), three equivalent O(3), and four equivalent O(2) atoms. Cu(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted corner-sharing CuO5 square pyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Sm(1) and two equivalent Cu(1) atoms to form OSm4Cu2 octahedra that share corners with four equivalent O(3)Sm3Cu2 square pyramids, edges with two equivalent O(1)Sm4Cu2 octahedra, and faces with four equivalent O(3)Sm3Cu2 square pyramids. In the second O site, O(2) is bonded in a 6-coordinate geometry to four equivalent Sm(1) and two equivalent Cu(1) atoms. In the third O site, O(3) is bonded to three equivalent Sm(1) and two equivalent Cu(1) atoms to form distorted OSm3Cu2 square pyramids that share corners with two equivalent O(1)Sm4Cu2 octahedra, corners with six equivalent O(3)Sm3Cu2 square pyramids,  an edgeedge with one O(3)Sm3Cu2 square pyramid, and faces with two equivalent O(1)Sm4Cu2 octahedra. The corner-sharing octahedral tilt angles are 50°. is represented by the CIF file [CIF]
data_Sm2Cu2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.767
_cell_length_b   5.790
_cell_length_c   9.892
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   215.721
_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
  Sm  Sm0  1  0.500  0.144  0.850  1.0
  Sm  Sm1  1  0.500  0.356  0.350  1.0
  Sm  Sm2  1  0.500  0.644  0.650  1.0
  Sm  Sm3  1  0.500  0.856  0.150  1.0
  Cu  Cu4  1  0.000  0.189  0.593  1.0
  Cu  Cu5  1  0.000  0.311  0.093  1.0
  Cu  Cu6  1  0.000  0.689  0.907  1.0
  Cu  Cu7  1  0.000  0.811  0.407  1.0
  O  O8  1  0.000  0.000  0.000  1.0
  O  O9  1  0.000  0.099  0.301  1.0
  O  O10  1  0.500  0.234  0.602  1.0
  O  O11  1  0.500  0.266  0.102  1.0
  O  O12  1  0.000  0.401  0.801  1.0
  O  O13  1  0.000  0.500  0.500  1.0
  O  O14  1  0.000  0.599  0.199  1.0
  O  O15  1  0.500  0.734  0.898  1.0
  O  O16  1  0.500  0.766  0.398  1.0
  O  O17  1  0.000  0.901  0.699  1.0
[/CIF]
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