The crystal structure described by SmP4HO12 crystallizes in the triclinic P-1 space group. Sm(1) is bonded to one O(1), one O(11), one O(2), one O(5), one O(6), one O(8), and one O(9) atom to form SmO7 pentagonal bipyramids that share  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with two equivalent Sm(1)O7 pentagonal bipyramids,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. In the second P site, P(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Sm(1)O7 pentagonal bipyramids,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. In the third P site, P(3) is bonded to one O(10), one O(7), one O(8), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Sm(1)O7 pentagonal bipyramids,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. In the fourth P site, P(4) is bonded to one O(10), one O(11), one O(12), and one O(3) atom to form PO4 tetrahedra that share  a cornercorner with one Sm(1)O7 pentagonal bipyramid,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. H(1) is bonded in a single-bond geometry to one O(12) and one O(2) atom. There are twelve inequivalent O sites. In the first O site, O(11) is bonded in a distorted bent 150 degrees geometry to one Sm(1) and one P(4) atom. In the second O site, O(12) is bonded in a bent 120 degrees geometry to one P(4) and one H(1) atom. In the third O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Sm(1) and one P(1) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to one Sm(1), one P(1), and one H(1) atom. In the fifth O site, O(3) is bonded in a bent 150 degrees geometry to one P(1) and one P(4) atom. In the sixth O site, O(4) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the seventh O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Sm(1) and one P(2) atom. In the eighth O site, O(6) is bonded in a 2-coordinate geometry to one Sm(1) and one P(2) atom. In the ninth O site, O(7) is bonded in a distorted bent 120 degrees geometry to one P(2) and one P(3) atom. In the tenth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Sm(1) and one P(3) atom. In the eleventh O site, O(9) is bonded in a bent 150 degrees geometry to one Sm(1) and one P(3) atom. In the twelfth O site, O(10) is bonded in a bent 150 degrees geometry to one P(3) and one P(4) atom. is represented by the CIF card [CIF]
data_SmP4HO12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.136
_cell_length_b   8.582
_cell_length_c   8.859
_cell_angle_alpha   99.108
_cell_angle_beta   112.209
_cell_angle_gamma   106.664
_symmetry_Int_Tables_number   1
_cell_volume   458.962
_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  0.092  0.264  0.259  1.0
  Sm  Sm1  1  0.908  0.736  0.741  1.0
  P  P2  1  0.615  0.286  0.580  1.0
  P  P3  1  0.385  0.714  0.420  1.0
  P  P4  1  0.075  0.382  0.658  1.0
  P  P5  1  0.925  0.618  0.342  1.0
  P  P6  1  0.211  0.189  0.894  1.0
  P  P7  1  0.789  0.811  0.106  1.0
  P  P8  1  0.576  0.128  0.847  1.0
  P  P9  1  0.424  0.872  0.153  1.0
  H  H10  1  0.488  0.858  0.746  1.0
  H  H11  1  0.512  0.142  0.254  1.0
  O  O12  1  0.679  0.458  0.694  1.0
  O  O13  1  0.321  0.542  0.306  1.0
  O  O14  1  0.442  0.229  0.400  1.0
  O  O15  1  0.558  0.771  0.600  1.0
  O  O16  1  0.541  0.144  0.665  1.0
  O  O17  1  0.459  0.856  0.335  1.0
  O  O18  1  0.822  0.259  0.571  1.0
  O  O19  1  0.178  0.741  0.429  1.0
  O  O20  1  0.101  0.564  0.697  1.0
  O  O21  1  0.899  0.436  0.303  1.0
  O  O22  1  0.171  0.317  0.551  1.0
  O  O23  1  0.829  0.683  0.449  1.0
  O  O24  1  0.166  0.346  0.838  1.0
  O  O25  1  0.834  0.654  0.162  1.0
  O  O26  1  0.054  0.024  0.762  1.0
  O  O27  1  0.946  0.976  0.238  1.0
  O  O28  1  0.239  0.214  0.071  1.0
  O  O29  1  0.761  0.786  0.929  1.0
  O  O30  1  0.450  0.227  0.903  1.0
  O  O31  1  0.550  0.773  0.097  1.0
  O  O32  1  0.807  0.196  0.973  1.0
  O  O33  1  0.193  0.804  0.027  1.0
  O  O34  1  0.444  0.937  0.810  1.0
  O  O35  1  0.556  0.063  0.190  1.0
[/CIF]
.
The crystal structure described by SmP4HO12 crystallizes in the triclinic P-1 space group. Sm(1) is bonded to one O(1), one O(11), one O(2), one O(5), one O(6), one O(8), and one O(9) atom to form SmO7 pentagonal bipyramids that share  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with two equivalent Sm(1)O7 pentagonal bipyramids,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. In the second P site, P(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Sm(1)O7 pentagonal bipyramids,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. In the third P site, P(3) is bonded to one O(10), one O(7), one O(8), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Sm(1)O7 pentagonal bipyramids,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. In the fourth P site, P(4) is bonded to one O(10), one O(11), one O(12), and one O(3) atom to form PO4 tetrahedra that share  a cornercorner with one Sm(1)O7 pentagonal bipyramid,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. H(1) is bonded in a single-bond geometry to one O(12) and one O(2) atom. There are twelve inequivalent O sites. In the first O site, O(11) is bonded in a distorted bent 150 degrees geometry to one Sm(1) and one P(4) atom. In the second O site, O(12) is bonded in a bent 120 degrees geometry to one P(4) and one H(1) atom. In the third O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Sm(1) and one P(1) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to one Sm(1), one P(1), and one H(1) atom. In the fifth O site, O(3) is bonded in a bent 150 degrees geometry to one P(1) and one P(4) atom. In the sixth O site, O(4) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the seventh O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Sm(1) and one P(2) atom. In the eighth O site, O(6) is bonded in a 2-coordinate geometry to one Sm(1) and one P(2) atom. In the ninth O site, O(7) is bonded in a distorted bent 120 degrees geometry to one P(2) and one P(3) atom. In the tenth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Sm(1) and one P(3) atom. In the eleventh O site, O(9) is bonded in a bent 150 degrees geometry to one Sm(1) and one P(3) atom. In the twelfth O site, O(10) is bonded in a bent 150 degrees geometry to one P(3) and one P(4) atom. is represented by the CIF card [CIF]
data_SmP4HO12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.136
_cell_length_b   8.582
_cell_length_c   8.859
_cell_angle_alpha   99.108
_cell_angle_beta   112.209
_cell_angle_gamma   106.664
_symmetry_Int_Tables_number   1
_cell_volume   458.962
_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  0.092  0.264  0.259  1.0
  Sm  Sm1  1  0.908  0.736  0.741  1.0
  P  P2  1  0.615  0.286  0.580  1.0
  P  P3  1  0.385  0.714  0.420  1.0
  P  P4  1  0.075  0.382  0.658  1.0
  P  P5  1  0.925  0.618  0.342  1.0
  P  P6  1  0.211  0.189  0.894  1.0
  P  P7  1  0.789  0.811  0.106  1.0
  P  P8  1  0.576  0.128  0.847  1.0
  P  P9  1  0.424  0.872  0.153  1.0
  H  H10  1  0.488  0.858  0.746  1.0
  H  H11  1  0.512  0.142  0.254  1.0
  O  O12  1  0.679  0.458  0.694  1.0
  O  O13  1  0.321  0.542  0.306  1.0
  O  O14  1  0.442  0.229  0.400  1.0
  O  O15  1  0.558  0.771  0.600  1.0
  O  O16  1  0.541  0.144  0.665  1.0
  O  O17  1  0.459  0.856  0.335  1.0
  O  O18  1  0.822  0.259  0.571  1.0
  O  O19  1  0.178  0.741  0.429  1.0
  O  O20  1  0.101  0.564  0.697  1.0
  O  O21  1  0.899  0.436  0.303  1.0
  O  O22  1  0.171  0.317  0.551  1.0
  O  O23  1  0.829  0.683  0.449  1.0
  O  O24  1  0.166  0.346  0.838  1.0
  O  O25  1  0.834  0.654  0.162  1.0
  O  O26  1  0.054  0.024  0.762  1.0
  O  O27  1  0.946  0.976  0.238  1.0
  O  O28  1  0.239  0.214  0.071  1.0
  O  O29  1  0.761  0.786  0.929  1.0
  O  O30  1  0.450  0.227  0.903  1.0
  O  O31  1  0.550  0.773  0.097  1.0
  O  O32  1  0.807  0.196  0.973  1.0
  O  O33  1  0.193  0.804  0.027  1.0
  O  O34  1  0.444  0.937  0.810  1.0
  O  O35  1  0.556  0.063  0.190  1.0
[/CIF]
.