The crystal structure described by IrP3O9 crystallizes in the triclinic P-1 space group. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to two equivalent O(1), two equivalent O(7), and two equivalent O(8) atoms to form IrO6 octahedra that share corners with two equivalent P(3)O4 tetrahedra and corners with four equivalent P(2)O4 tetrahedra. In the second Ir site, Ir(2) is bonded to two equivalent O(4), two equivalent O(5), and two equivalent O(9) atoms to form IrO6 octahedra that share corners with two equivalent P(3)O4 tetrahedra and corners with four equivalent P(1)O4 tetrahedra. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(5), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Ir(2)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-52°. In the second P site, P(2) is bonded to one O(1), one O(2), one O(6), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Ir(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-57°. In the third P site, P(3) is bonded to one O(3), one O(4), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Ir(1)O6 octahedra,  a cornercorner with one Ir(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-57°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Ir(1) and one P(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one P(1) and one P(3) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Ir(2) and one P(3) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Ir(2) and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one P(2) and one P(3) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Ir(1) and one P(3) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Ir(1) and one P(2) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Ir(2) and one P(1) atom. is represented by the CIF file [CIF]
data_P3IrO9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.011
_cell_length_b   7.008
_cell_length_c   10.334
_cell_angle_alpha   98.495
_cell_angle_beta   92.339
_cell_angle_gamma   92.503
_symmetry_Int_Tables_number   1
_cell_volume   358.179
_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
  P  P0  1  0.499  0.328  0.639  1.0
  P  P1  1  0.501  0.672  0.361  1.0
  P  P2  1  0.476  0.041  0.818  1.0
  P  P3  1  0.524  0.959  0.182  1.0
  P  P4  1  0.236  0.314  0.228  1.0
  P  P5  1  0.764  0.686  0.772  1.0
  Ir  Ir6  1  0.000  0.000  0.000  1.0
  Ir  Ir7  1  0.000  0.500  0.500  1.0
  O  O8  1  0.331  0.880  0.071  1.0
  O  O9  1  0.669  0.120  0.929  1.0
  O  O10  1  0.454  0.869  0.310  1.0
  O  O11  1  0.546  0.131  0.690  1.0
  O  O12  1  0.620  0.479  0.761  1.0
  O  O13  1  0.380  0.521  0.239  1.0
  O  O14  1  0.920  0.704  0.654  1.0
  O  O15  1  0.080  0.296  0.346  1.0
  O  O16  1  0.660  0.335  0.521  1.0
  O  O17  1  0.340  0.665  0.479  1.0
  O  O18  1  0.484  0.179  0.230  1.0
  O  O19  1  0.516  0.821  0.770  1.0
  O  O20  1  0.904  0.725  0.904  1.0
  O  O21  1  0.096  0.275  0.096  1.0
  O  O22  1  0.813  0.928  0.160  1.0
  O  O23  1  0.187  0.072  0.840  1.0
  O  O24  1  0.796  0.653  0.377  1.0
  O  O25  1  0.204  0.347  0.623  1.0
[/CIF]
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The crystal structure described by IrP3O9 crystallizes in the triclinic P-1 space group. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to two equivalent O(1), two equivalent O(7), and two equivalent O(8) atoms to form IrO6 octahedra that share corners with two equivalent P(3)O4 tetrahedra and corners with four equivalent P(2)O4 tetrahedra. In the second Ir site, Ir(2) is bonded to two equivalent O(4), two equivalent O(5), and two equivalent O(9) atoms to form IrO6 octahedra that share corners with two equivalent P(3)O4 tetrahedra and corners with four equivalent P(1)O4 tetrahedra. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(5), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Ir(2)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-52°. In the second P site, P(2) is bonded to one O(1), one O(2), one O(6), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Ir(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-57°. In the third P site, P(3) is bonded to one O(3), one O(4), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Ir(1)O6 octahedra,  a cornercorner with one Ir(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-57°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Ir(1) and one P(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one P(1) and one P(3) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Ir(2) and one P(3) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Ir(2) and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one P(2) and one P(3) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Ir(1) and one P(3) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Ir(1) and one P(2) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Ir(2) and one P(1) atom. is represented by the CIF file [CIF]
data_P3IrO9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.011
_cell_length_b   7.008
_cell_length_c   10.334
_cell_angle_alpha   98.495
_cell_angle_beta   92.339
_cell_angle_gamma   92.503
_symmetry_Int_Tables_number   1
_cell_volume   358.179
_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
  P  P0  1  0.499  0.328  0.639  1.0
  P  P1  1  0.501  0.672  0.361  1.0
  P  P2  1  0.476  0.041  0.818  1.0
  P  P3  1  0.524  0.959  0.182  1.0
  P  P4  1  0.236  0.314  0.228  1.0
  P  P5  1  0.764  0.686  0.772  1.0
  Ir  Ir6  1  0.000  0.000  0.000  1.0
  Ir  Ir7  1  0.000  0.500  0.500  1.0
  O  O8  1  0.331  0.880  0.071  1.0
  O  O9  1  0.669  0.120  0.929  1.0
  O  O10  1  0.454  0.869  0.310  1.0
  O  O11  1  0.546  0.131  0.690  1.0
  O  O12  1  0.620  0.479  0.761  1.0
  O  O13  1  0.380  0.521  0.239  1.0
  O  O14  1  0.920  0.704  0.654  1.0
  O  O15  1  0.080  0.296  0.346  1.0
  O  O16  1  0.660  0.335  0.521  1.0
  O  O17  1  0.340  0.665  0.479  1.0
  O  O18  1  0.484  0.179  0.230  1.0
  O  O19  1  0.516  0.821  0.770  1.0
  O  O20  1  0.904  0.725  0.904  1.0
  O  O21  1  0.096  0.275  0.096  1.0
  O  O22  1  0.813  0.928  0.160  1.0
  O  O23  1  0.187  0.072  0.840  1.0
  O  O24  1  0.796  0.653  0.377  1.0
  O  O25  1  0.204  0.347  0.623  1.0
[/CIF]
.