The structure described by TaOPO4 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(6), one O(7), two equivalent O(2), and two equivalent O(4) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with three equivalent P(2)O4 tetrahedra. The corner-sharing octahedra are not tilted. In the second Ta site, Ta(2) is bonded to one O(5), one O(8), two equivalent O(1), and two equivalent O(3) atoms to form TaO6 octahedra that share corners with two equivalent Ta(2)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and corners with three equivalent P(1)O4 tetrahedra. The corner-sharing octahedra are not tilted. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(6), one O(8), and two equivalent O(3) atoms to form PO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra and corners with three equivalent Ta(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-20°. In the second P site, P(2) is bonded to one O(5), one O(7), and two equivalent O(4) atoms to form PO4 tetrahedra that share  a cornercorner with one Ta(2)O6 octahedra and corners with three equivalent Ta(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 12-26°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Ta(2) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent Ta(1) atoms. In the third O site, O(3) is bonded in a linear geometry to one Ta(2) and one P(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Ta(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a linear geometry to one Ta(2) and one P(2) atom. In the sixth O site, O(6) is bonded in a linear geometry to one Ta(1) and one P(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Ta(1) and one P(2) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Ta(2) and one P(1) atom. is represented by the CIF file [CIF]
data_TaPO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.365
_cell_length_b   6.716
_cell_length_c   11.318
_cell_angle_alpha   89.840
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   407.847
_cell_formula_units_Z   4
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
  Ta  Ta0  1  0.750  0.170  0.438  1.0
  Ta  Ta1  1  0.250  0.830  0.562  1.0
  Ta  Ta2  1  0.750  0.332  0.937  1.0
  Ta  Ta3  1  0.250  0.668  0.063  1.0
  P  P4  1  0.750  0.971  0.155  1.0
  P  P5  1  0.250  0.029  0.845  1.0
  P  P6  1  0.750  0.526  0.654  1.0
  P  P7  1  0.250  0.474  0.346  1.0
  O  O8  1  0.000  0.500  0.000  1.0
  O  O9  1  0.500  0.500  0.000  1.0
  O  O10  1  0.500  0.000  0.500  1.0
  O  O11  1  0.000  0.000  0.500  1.0
  O  O12  1  0.016  0.149  0.869  1.0
  O  O13  1  0.516  0.851  0.131  1.0
  O  O14  1  0.984  0.851  0.131  1.0
  O  O15  1  0.484  0.149  0.869  1.0
  O  O16  1  0.484  0.356  0.375  1.0
  O  O17  1  0.984  0.644  0.625  1.0
  O  O18  1  0.516  0.644  0.625  1.0
  O  O19  1  0.016  0.356  0.375  1.0
  O  O20  1  0.750  0.476  0.785  1.0
  O  O21  1  0.250  0.524  0.215  1.0
  O  O22  1  0.750  0.034  0.284  1.0
  O  O23  1  0.250  0.966  0.716  1.0
  O  O24  1  0.750  0.332  0.584  1.0
  O  O25  1  0.250  0.668  0.416  1.0
  O  O26  1  0.750  0.159  0.079  1.0
  O  O27  1  0.250  0.841  0.921  1.0
[/CIF]
.
The structure described by TaOPO4 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(6), one O(7), two equivalent O(2), and two equivalent O(4) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with three equivalent P(2)O4 tetrahedra. The corner-sharing octahedra are not tilted. In the second Ta site, Ta(2) is bonded to one O(5), one O(8), two equivalent O(1), and two equivalent O(3) atoms to form TaO6 octahedra that share corners with two equivalent Ta(2)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and corners with three equivalent P(1)O4 tetrahedra. The corner-sharing octahedra are not tilted. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(6), one O(8), and two equivalent O(3) atoms to form PO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra and corners with three equivalent Ta(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-20°. In the second P site, P(2) is bonded to one O(5), one O(7), and two equivalent O(4) atoms to form PO4 tetrahedra that share  a cornercorner with one Ta(2)O6 octahedra and corners with three equivalent Ta(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 12-26°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Ta(2) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent Ta(1) atoms. In the third O site, O(3) is bonded in a linear geometry to one Ta(2) and one P(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Ta(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a linear geometry to one Ta(2) and one P(2) atom. In the sixth O site, O(6) is bonded in a linear geometry to one Ta(1) and one P(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Ta(1) and one P(2) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Ta(2) and one P(1) atom. is represented by the CIF file [CIF]
data_TaPO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.365
_cell_length_b   6.716
_cell_length_c   11.318
_cell_angle_alpha   89.840
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   407.847
_cell_formula_units_Z   4
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
  Ta  Ta0  1  0.750  0.170  0.438  1.0
  Ta  Ta1  1  0.250  0.830  0.562  1.0
  Ta  Ta2  1  0.750  0.332  0.937  1.0
  Ta  Ta3  1  0.250  0.668  0.063  1.0
  P  P4  1  0.750  0.971  0.155  1.0
  P  P5  1  0.250  0.029  0.845  1.0
  P  P6  1  0.750  0.526  0.654  1.0
  P  P7  1  0.250  0.474  0.346  1.0
  O  O8  1  0.000  0.500  0.000  1.0
  O  O9  1  0.500  0.500  0.000  1.0
  O  O10  1  0.500  0.000  0.500  1.0
  O  O11  1  0.000  0.000  0.500  1.0
  O  O12  1  0.016  0.149  0.869  1.0
  O  O13  1  0.516  0.851  0.131  1.0
  O  O14  1  0.984  0.851  0.131  1.0
  O  O15  1  0.484  0.149  0.869  1.0
  O  O16  1  0.484  0.356  0.375  1.0
  O  O17  1  0.984  0.644  0.625  1.0
  O  O18  1  0.516  0.644  0.625  1.0
  O  O19  1  0.016  0.356  0.375  1.0
  O  O20  1  0.750  0.476  0.785  1.0
  O  O21  1  0.250  0.524  0.215  1.0
  O  O22  1  0.750  0.034  0.284  1.0
  O  O23  1  0.250  0.966  0.716  1.0
  O  O24  1  0.750  0.332  0.584  1.0
  O  O25  1  0.250  0.668  0.416  1.0
  O  O26  1  0.750  0.159  0.079  1.0
  O  O27  1  0.250  0.841  0.921  1.0
[/CIF]
.