The compound described by Lu3TaO7 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Lu sites. In the first Lu site, Lu(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(4) atoms. In the second Lu site, Lu(2) is bonded to one O(3), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted LuO7 pentagonal bipyramids that share corners with two equivalent Ta(1)O6 octahedra, corners with three equivalent Lu(2)O7 pentagonal bipyramids, edges with two equivalent Ta(1)O6 octahedra, and edges with two equivalent Lu(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 36-45°. Ta(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with four equivalent Lu(2)O7 pentagonal bipyramids, and edges with four equivalent Lu(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 40°. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Lu(1), two equivalent Lu(2), and one Ta(1) atom to form distorted OLu3Ta tetrahedra that share corners with four equivalent O(4)Lu4 tetrahedra, edges with two equivalent O(1)Lu3Ta tetrahedra, and edges with two equivalent O(4)Lu4 tetrahedra. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Lu(2) and one Ta(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Lu(2) and two equivalent Ta(1) atoms. In the fourth O site, O(4) is bonded to two equivalent Lu(1) and two equivalent Lu(2) atoms to form OLu4 tetrahedra that share corners with four equivalent O(1)Lu3Ta tetrahedra, corners with six equivalent O(4)Lu4 tetrahedra,  an edgeedge with one O(4)Lu4 tetrahedra, and edges with two equivalent O(1)Lu3Ta tetrahedra. is represented by the CIF card [CIF]
data_Lu3TaO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.342
_cell_length_b   7.412
_cell_length_c   10.399
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   565.874
_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
  Lu  Lu0  1  0.012  0.795  0.250  1.0
  Lu  Lu1  1  0.252  0.969  0.519  1.0
  Lu  Lu2  1  0.252  0.969  0.981  1.0
  Lu  Lu3  1  0.248  0.469  0.019  1.0
  Lu  Lu4  1  0.248  0.469  0.481  1.0
  Lu  Lu5  1  0.488  0.295  0.750  1.0
  Lu  Lu6  1  0.512  0.705  0.250  1.0
  Lu  Lu7  1  0.752  0.531  0.519  1.0
  Lu  Lu8  1  0.752  0.531  0.981  1.0
  Lu  Lu9  1  0.748  0.031  0.019  1.0
  Lu  Lu10  1  0.748  0.031  0.481  1.0
  Lu  Lu11  1  0.988  0.205  0.750  1.0
  Ta  Ta12  1  0.999  0.747  0.750  1.0
  Ta  Ta13  1  0.501  0.247  0.250  1.0
  Ta  Ta14  1  0.499  0.753  0.750  1.0
  Ta  Ta15  1  0.001  0.253  0.250  1.0
  O  O16  1  0.037  0.044  0.123  1.0
  O  O17  1  0.037  0.044  0.377  1.0
  O  O18  1  0.041  0.579  0.611  1.0
  O  O19  1  0.041  0.579  0.889  1.0
  O  O20  1  0.249  0.340  0.250  1.0
  O  O21  1  0.254  0.731  0.116  1.0
  O  O22  1  0.254  0.731  0.384  1.0
  O  O23  1  0.246  0.231  0.616  1.0
  O  O24  1  0.246  0.231  0.884  1.0
  O  O25  1  0.251  0.840  0.750  1.0
  O  O26  1  0.459  0.079  0.111  1.0
  O  O27  1  0.459  0.079  0.389  1.0
  O  O28  1  0.463  0.544  0.623  1.0
  O  O29  1  0.463  0.544  0.877  1.0
  O  O30  1  0.537  0.456  0.123  1.0
  O  O31  1  0.537  0.456  0.377  1.0
  O  O32  1  0.541  0.921  0.611  1.0
  O  O33  1  0.541  0.921  0.889  1.0
  O  O34  1  0.749  0.160  0.250  1.0
  O  O35  1  0.754  0.769  0.116  1.0
  O  O36  1  0.754  0.769  0.384  1.0
  O  O37  1  0.746  0.269  0.616  1.0
  O  O38  1  0.746  0.269  0.884  1.0
  O  O39  1  0.751  0.660  0.750  1.0
  O  O40  1  0.959  0.421  0.111  1.0
  O  O41  1  0.959  0.421  0.389  1.0
  O  O42  1  0.963  0.956  0.623  1.0
  O  O43  1  0.963  0.956  0.877  1.0
[/CIF]
.
The compound described by Lu3TaO7 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Lu sites. In the first Lu site, Lu(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(4) atoms. In the second Lu site, Lu(2) is bonded to one O(3), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted LuO7 pentagonal bipyramids that share corners with two equivalent Ta(1)O6 octahedra, corners with three equivalent Lu(2)O7 pentagonal bipyramids, edges with two equivalent Ta(1)O6 octahedra, and edges with two equivalent Lu(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 36-45°. Ta(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with four equivalent Lu(2)O7 pentagonal bipyramids, and edges with four equivalent Lu(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 40°. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Lu(1), two equivalent Lu(2), and one Ta(1) atom to form distorted OLu3Ta tetrahedra that share corners with four equivalent O(4)Lu4 tetrahedra, edges with two equivalent O(1)Lu3Ta tetrahedra, and edges with two equivalent O(4)Lu4 tetrahedra. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Lu(2) and one Ta(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Lu(2) and two equivalent Ta(1) atoms. In the fourth O site, O(4) is bonded to two equivalent Lu(1) and two equivalent Lu(2) atoms to form OLu4 tetrahedra that share corners with four equivalent O(1)Lu3Ta tetrahedra, corners with six equivalent O(4)Lu4 tetrahedra,  an edgeedge with one O(4)Lu4 tetrahedra, and edges with two equivalent O(1)Lu3Ta tetrahedra. is represented by the CIF card [CIF]
data_Lu3TaO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.342
_cell_length_b   7.412
_cell_length_c   10.399
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   565.874
_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
  Lu  Lu0  1  0.012  0.795  0.250  1.0
  Lu  Lu1  1  0.252  0.969  0.519  1.0
  Lu  Lu2  1  0.252  0.969  0.981  1.0
  Lu  Lu3  1  0.248  0.469  0.019  1.0
  Lu  Lu4  1  0.248  0.469  0.481  1.0
  Lu  Lu5  1  0.488  0.295  0.750  1.0
  Lu  Lu6  1  0.512  0.705  0.250  1.0
  Lu  Lu7  1  0.752  0.531  0.519  1.0
  Lu  Lu8  1  0.752  0.531  0.981  1.0
  Lu  Lu9  1  0.748  0.031  0.019  1.0
  Lu  Lu10  1  0.748  0.031  0.481  1.0
  Lu  Lu11  1  0.988  0.205  0.750  1.0
  Ta  Ta12  1  0.999  0.747  0.750  1.0
  Ta  Ta13  1  0.501  0.247  0.250  1.0
  Ta  Ta14  1  0.499  0.753  0.750  1.0
  Ta  Ta15  1  0.001  0.253  0.250  1.0
  O  O16  1  0.037  0.044  0.123  1.0
  O  O17  1  0.037  0.044  0.377  1.0
  O  O18  1  0.041  0.579  0.611  1.0
  O  O19  1  0.041  0.579  0.889  1.0
  O  O20  1  0.249  0.340  0.250  1.0
  O  O21  1  0.254  0.731  0.116  1.0
  O  O22  1  0.254  0.731  0.384  1.0
  O  O23  1  0.246  0.231  0.616  1.0
  O  O24  1  0.246  0.231  0.884  1.0
  O  O25  1  0.251  0.840  0.750  1.0
  O  O26  1  0.459  0.079  0.111  1.0
  O  O27  1  0.459  0.079  0.389  1.0
  O  O28  1  0.463  0.544  0.623  1.0
  O  O29  1  0.463  0.544  0.877  1.0
  O  O30  1  0.537  0.456  0.123  1.0
  O  O31  1  0.537  0.456  0.377  1.0
  O  O32  1  0.541  0.921  0.611  1.0
  O  O33  1  0.541  0.921  0.889  1.0
  O  O34  1  0.749  0.160  0.250  1.0
  O  O35  1  0.754  0.769  0.116  1.0
  O  O36  1  0.754  0.769  0.384  1.0
  O  O37  1  0.746  0.269  0.616  1.0
  O  O38  1  0.746  0.269  0.884  1.0
  O  O39  1  0.751  0.660  0.750  1.0
  O  O40  1  0.959  0.421  0.111  1.0
  O  O41  1  0.959  0.421  0.389  1.0
  O  O42  1  0.963  0.956  0.623  1.0
  O  O43  1  0.963  0.956  0.877  1.0
[/CIF]
.