The material structure described by SrSmGa3O7 crystallizes in the orthorhombic Cmm2 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(3), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms. Sm(1) is bonded in a 8-coordinate geometry to one O(4), one O(6), two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form corner-sharing GaO4 tetrahedra. In the second Ga site, Ga(2) is bonded to one O(4), one O(5), and two equivalent O(1) atoms to form distorted corner-sharing GaO4 tetrahedra. In the third Ga site, Ga(3) is bonded to one O(3), one O(6), and two equivalent O(2) atoms to form corner-sharing GaO4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), one Sm(1), one Ga(1), and one Ga(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sm(1), one Ga(1), and one Ga(3) atom. In the third O site, O(3) is bonded to two equivalent Sr(1) and two equivalent Ga(3) atoms to form distorted OSr2Ga2 tetrahedra that share corners with two equivalent O(6)Sr2SmGa tetrahedra, corners with two equivalent O(5)SrSm2Ga tetrahedra, and edges with two equivalent O(6)Sr2SmGa tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Sm(1) and two equivalent Ga(2) atoms to form OSm2Ga2 tetrahedra that share corners with two equivalent O(6)Sr2SmGa tetrahedra, corners with two equivalent O(5)SrSm2Ga tetrahedra, and edges with two equivalent O(5)SrSm2Ga tetrahedra. In the fifth O site, O(5) is bonded to one Sr(1), two equivalent Sm(1), and one Ga(2) atom to form OSrSm2Ga tetrahedra that share  a cornercorner with one O(4)Sm2Ga2 tetrahedra,  a cornercorner with one O(3)Sr2Ga2 tetrahedra, corners with four equivalent O(6)Sr2SmGa tetrahedra,  an edgeedge with one O(4)Sm2Ga2 tetrahedra, and  an edgeedge with one O(5)SrSm2Ga tetrahedra. In the sixth O site, O(6) is bonded to two equivalent Sr(1), one Sm(1), and one Ga(3) atom to form distorted OSr2SmGa tetrahedra that share  a cornercorner with one O(4)Sm2Ga2 tetrahedra,  a cornercorner with one O(3)Sr2Ga2 tetrahedra, corners with four equivalent O(5)SrSm2Ga tetrahedra,  an edgeedge with one O(3)Sr2Ga2 tetrahedra, and  an edgeedge with one O(6)Sr2SmGa tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_SrSmGa3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.050
_cell_length_b   8.050
_cell_length_c   5.329
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.946
_symmetry_Int_Tables_number   1
_cell_volume   345.295
_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
  Sr  Sr0  1  0.162  0.838  0.491  1.0
  Sr  Sr1  1  0.838  0.162  0.491  1.0
  Sm  Sm2  1  0.661  0.661  0.515  1.0
  Sm  Sm3  1  0.339  0.339  0.515  1.0
  Ga  Ga4  1  0.500  0.000  0.995  1.0
  Ga  Ga5  1  0.000  0.500  0.995  1.0
  Ga  Ga6  1  0.359  0.641  0.034  1.0
  Ga  Ga7  1  0.852  0.852  0.967  1.0
  Ga  Ga8  1  0.641  0.359  0.034  1.0
  Ga  Ga9  1  0.148  0.148  0.967  1.0
  O  O10  1  0.418  0.835  0.205  1.0
  O  O11  1  0.901  0.657  0.787  1.0
  O  O12  1  0.582  0.165  0.205  1.0
  O  O13  1  0.099  0.343  0.787  1.0
  O  O14  1  0.343  0.099  0.787  1.0
  O  O15  1  0.835  0.418  0.205  1.0
  O  O16  1  0.657  0.901  0.787  1.0
  O  O17  1  0.165  0.582  0.205  1.0
  O  O18  1  0.000  0.000  0.819  1.0
  O  O19  1  0.500  0.500  0.213  1.0
  O  O20  1  0.373  0.627  0.693  1.0
  O  O21  1  0.846  0.846  0.306  1.0
  O  O22  1  0.627  0.373  0.693  1.0
  O  O23  1  0.154  0.154  0.306  1.0
[/CIF]
.
The material structure described by SrSmGa3O7 crystallizes in the orthorhombic Cmm2 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(3), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms. Sm(1) is bonded in a 8-coordinate geometry to one O(4), one O(6), two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form corner-sharing GaO4 tetrahedra. In the second Ga site, Ga(2) is bonded to one O(4), one O(5), and two equivalent O(1) atoms to form distorted corner-sharing GaO4 tetrahedra. In the third Ga site, Ga(3) is bonded to one O(3), one O(6), and two equivalent O(2) atoms to form corner-sharing GaO4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), one Sm(1), one Ga(1), and one Ga(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sm(1), one Ga(1), and one Ga(3) atom. In the third O site, O(3) is bonded to two equivalent Sr(1) and two equivalent Ga(3) atoms to form distorted OSr2Ga2 tetrahedra that share corners with two equivalent O(6)Sr2SmGa tetrahedra, corners with two equivalent O(5)SrSm2Ga tetrahedra, and edges with two equivalent O(6)Sr2SmGa tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Sm(1) and two equivalent Ga(2) atoms to form OSm2Ga2 tetrahedra that share corners with two equivalent O(6)Sr2SmGa tetrahedra, corners with two equivalent O(5)SrSm2Ga tetrahedra, and edges with two equivalent O(5)SrSm2Ga tetrahedra. In the fifth O site, O(5) is bonded to one Sr(1), two equivalent Sm(1), and one Ga(2) atom to form OSrSm2Ga tetrahedra that share  a cornercorner with one O(4)Sm2Ga2 tetrahedra,  a cornercorner with one O(3)Sr2Ga2 tetrahedra, corners with four equivalent O(6)Sr2SmGa tetrahedra,  an edgeedge with one O(4)Sm2Ga2 tetrahedra, and  an edgeedge with one O(5)SrSm2Ga tetrahedra. In the sixth O site, O(6) is bonded to two equivalent Sr(1), one Sm(1), and one Ga(3) atom to form distorted OSr2SmGa tetrahedra that share  a cornercorner with one O(4)Sm2Ga2 tetrahedra,  a cornercorner with one O(3)Sr2Ga2 tetrahedra, corners with four equivalent O(5)SrSm2Ga tetrahedra,  an edgeedge with one O(3)Sr2Ga2 tetrahedra, and  an edgeedge with one O(6)Sr2SmGa tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_SrSmGa3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.050
_cell_length_b   8.050
_cell_length_c   5.329
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.946
_symmetry_Int_Tables_number   1
_cell_volume   345.295
_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
  Sr  Sr0  1  0.162  0.838  0.491  1.0
  Sr  Sr1  1  0.838  0.162  0.491  1.0
  Sm  Sm2  1  0.661  0.661  0.515  1.0
  Sm  Sm3  1  0.339  0.339  0.515  1.0
  Ga  Ga4  1  0.500  0.000  0.995  1.0
  Ga  Ga5  1  0.000  0.500  0.995  1.0
  Ga  Ga6  1  0.359  0.641  0.034  1.0
  Ga  Ga7  1  0.852  0.852  0.967  1.0
  Ga  Ga8  1  0.641  0.359  0.034  1.0
  Ga  Ga9  1  0.148  0.148  0.967  1.0
  O  O10  1  0.418  0.835  0.205  1.0
  O  O11  1  0.901  0.657  0.787  1.0
  O  O12  1  0.582  0.165  0.205  1.0
  O  O13  1  0.099  0.343  0.787  1.0
  O  O14  1  0.343  0.099  0.787  1.0
  O  O15  1  0.835  0.418  0.205  1.0
  O  O16  1  0.657  0.901  0.787  1.0
  O  O17  1  0.165  0.582  0.205  1.0
  O  O18  1  0.000  0.000  0.819  1.0
  O  O19  1  0.500  0.500  0.213  1.0
  O  O20  1  0.373  0.627  0.693  1.0
  O  O21  1  0.846  0.846  0.306  1.0
  O  O22  1  0.627  0.373  0.693  1.0
  O  O23  1  0.154  0.154  0.306  1.0
[/CIF]
.