The material structure described by Sm2As4O9 crystallizes in the triclinic P-1 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(4), one O(6), one O(8), two equivalent O(5), and two equivalent O(9) atoms. In the second Sm site, Sm(2) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(6), two equivalent O(7), and two equivalent O(8) atoms. There are four inequivalent As sites. In the first As site, As(1) is bonded in a distorted T-shaped geometry to one O(1), one O(2), and one O(3) atom. In the second As site, As(2) is bonded in a distorted trigonal non-coplanar geometry to one O(2), one O(3), and one O(4) atom. In the third As site, As(3) is bonded in a distorted trigonal non-coplanar geometry to one O(5), one O(6), and one O(9) atom. In the fourth As site, As(4) is bonded in a distorted T-shaped geometry to one O(7), one O(8), and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sm(1), one Sm(2), and one As(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Sm(1), one As(1), and one As(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one As(1) and one As(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sm(1), one Sm(2), and one As(2) atom. In the fifth O site, O(5) is bonded to one Sm(2), two equivalent Sm(1), and one As(3) atom to form a mixture of distorted corner and edge-sharing OSm3As tetrahedra. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Sm(1), one Sm(2), and one As(3) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Sm(2) and one As(4) atom. In the eighth O site, O(8) is bonded to one Sm(1), two equivalent Sm(2), and one As(4) atom to form a mixture of distorted corner and edge-sharing OSm3As tetrahedra. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to two equivalent Sm(1), one As(3), and one As(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sm2As4O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.826
_cell_length_b   7.585
_cell_length_c   9.614
_cell_angle_alpha   96.148
_cell_angle_beta   103.983
_cell_angle_gamma   104.492
_symmetry_Int_Tables_number   1
_cell_volume   460.178
_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  0.248  0.942  0.620  1.0
  Sm  Sm1  1  0.752  0.058  0.380  1.0
  Sm  Sm2  1  0.722  0.532  0.407  1.0
  Sm  Sm3  1  0.278  0.468  0.593  1.0
  As  As4  1  0.678  0.772  0.064  1.0
  As  As5  1  0.322  0.228  0.936  1.0
  As  As6  1  0.177  0.759  0.918  1.0
  As  As7  1  0.823  0.241  0.082  1.0
  As  As8  1  0.749  0.921  0.714  1.0
  As  As9  1  0.251  0.079  0.286  1.0
  As  As10  1  0.808  0.351  0.707  1.0
  As  As11  1  0.192  0.649  0.293  1.0
  O  O12  1  0.724  0.749  0.246  1.0
  O  O13  1  0.276  0.251  0.754  1.0
  O  O14  1  0.317  0.984  0.884  1.0
  O  O15  1  0.683  0.016  0.116  1.0
  O  O16  1  0.605  0.320  0.992  1.0
  O  O17  1  0.395  0.680  0.008  1.0
  O  O18  1  0.131  0.661  0.738  1.0
  O  O19  1  0.869  0.339  0.262  1.0
  O  O20  1  0.843  0.871  0.561  1.0
  O  O21  1  0.157  0.129  0.439  1.0
  O  O22  1  0.496  0.774  0.672  1.0
  O  O23  1  0.504  0.226  0.328  1.0
  O  O24  1  0.373  0.540  0.373  1.0
  O  O25  1  0.627  0.460  0.627  1.0
  O  O26  1  0.092  0.668  0.448  1.0
  O  O27  1  0.908  0.332  0.552  1.0
  O  O28  1  0.367  0.896  0.356  1.0
  O  O29  1  0.633  0.104  0.644  1.0
[/CIF]
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The material structure described by Sm2As4O9 crystallizes in the triclinic P-1 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(4), one O(6), one O(8), two equivalent O(5), and two equivalent O(9) atoms. In the second Sm site, Sm(2) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(6), two equivalent O(7), and two equivalent O(8) atoms. There are four inequivalent As sites. In the first As site, As(1) is bonded in a distorted T-shaped geometry to one O(1), one O(2), and one O(3) atom. In the second As site, As(2) is bonded in a distorted trigonal non-coplanar geometry to one O(2), one O(3), and one O(4) atom. In the third As site, As(3) is bonded in a distorted trigonal non-coplanar geometry to one O(5), one O(6), and one O(9) atom. In the fourth As site, As(4) is bonded in a distorted T-shaped geometry to one O(7), one O(8), and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sm(1), one Sm(2), and one As(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Sm(1), one As(1), and one As(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one As(1) and one As(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sm(1), one Sm(2), and one As(2) atom. In the fifth O site, O(5) is bonded to one Sm(2), two equivalent Sm(1), and one As(3) atom to form a mixture of distorted corner and edge-sharing OSm3As tetrahedra. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Sm(1), one Sm(2), and one As(3) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Sm(2) and one As(4) atom. In the eighth O site, O(8) is bonded to one Sm(1), two equivalent Sm(2), and one As(4) atom to form a mixture of distorted corner and edge-sharing OSm3As tetrahedra. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to two equivalent Sm(1), one As(3), and one As(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sm2As4O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.826
_cell_length_b   7.585
_cell_length_c   9.614
_cell_angle_alpha   96.148
_cell_angle_beta   103.983
_cell_angle_gamma   104.492
_symmetry_Int_Tables_number   1
_cell_volume   460.178
_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  0.248  0.942  0.620  1.0
  Sm  Sm1  1  0.752  0.058  0.380  1.0
  Sm  Sm2  1  0.722  0.532  0.407  1.0
  Sm  Sm3  1  0.278  0.468  0.593  1.0
  As  As4  1  0.678  0.772  0.064  1.0
  As  As5  1  0.322  0.228  0.936  1.0
  As  As6  1  0.177  0.759  0.918  1.0
  As  As7  1  0.823  0.241  0.082  1.0
  As  As8  1  0.749  0.921  0.714  1.0
  As  As9  1  0.251  0.079  0.286  1.0
  As  As10  1  0.808  0.351  0.707  1.0
  As  As11  1  0.192  0.649  0.293  1.0
  O  O12  1  0.724  0.749  0.246  1.0
  O  O13  1  0.276  0.251  0.754  1.0
  O  O14  1  0.317  0.984  0.884  1.0
  O  O15  1  0.683  0.016  0.116  1.0
  O  O16  1  0.605  0.320  0.992  1.0
  O  O17  1  0.395  0.680  0.008  1.0
  O  O18  1  0.131  0.661  0.738  1.0
  O  O19  1  0.869  0.339  0.262  1.0
  O  O20  1  0.843  0.871  0.561  1.0
  O  O21  1  0.157  0.129  0.439  1.0
  O  O22  1  0.496  0.774  0.672  1.0
  O  O23  1  0.504  0.226  0.328  1.0
  O  O24  1  0.373  0.540  0.373  1.0
  O  O25  1  0.627  0.460  0.627  1.0
  O  O26  1  0.092  0.668  0.448  1.0
  O  O27  1  0.908  0.332  0.552  1.0
  O  O28  1  0.367  0.896  0.356  1.0
  O  O29  1  0.633  0.104  0.644  1.0
[/CIF]
.