The material described by LaZrTa3O11 crystallizes in the monoclinic C2 space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to two equivalent O(10), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. In the second La site, La(2) is bonded in a 8-coordinate geometry to two equivalent O(11), two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms. Zr(1) is bonded to one O(1), one O(10), one O(11), one O(2), one O(3), one O(6), and one O(7) atom to form distorted ZrO7 pentagonal bipyramids that share  a cornercorner with one Ta(3)O6 octahedra and  a cornercorner with one Ta(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-47°. There are four inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(11), one O(2), one O(3), one O(5), and one O(8) atom. In the second Ta site, Ta(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(11), one O(2), one O(3), one O(4), and one O(9) atom. In the third Ta site, Ta(3) is bonded to two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms to form TaO6 octahedra that share corners with two equivalent Zr(1)O7 pentagonal bipyramids. In the fourth Ta site, Ta(4) is bonded to two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms to form TaO6 octahedra that share corners with two equivalent Zr(1)O7 pentagonal bipyramids. There are eleven inequivalent O sites. In the first O site, O(10) is bonded to one La(1), one Zr(1), one Ta(1), and one Ta(2) atom to form distorted corner-sharing OLaZrTa2 tetrahedra. In the second O site, O(11) is bonded to one La(2), one Zr(1), one Ta(1), and one Ta(2) atom to form distorted corner-sharing OLaZrTa2 tetrahedra. In the third O site, O(1) is bonded in a 3-coordinate geometry to one Zr(1), one Ta(1), and one Ta(2) atom. In the fourth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Zr(1), one Ta(1), and one Ta(2) atom. In the fifth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Zr(1), one Ta(1), and one Ta(2) atom. In the sixth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one La(1), one Ta(2), and one Ta(4) atom. In the seventh O site, O(5) is bonded in a 3-coordinate geometry to one La(1), one Ta(1), and one Ta(4) atom. In the eighth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one La(1), one Zr(1), and one Ta(4) atom. In the ninth O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one La(2), one Zr(1), and one Ta(3) atom. In the tenth O site, O(8) is bonded in a 3-coordinate geometry to one La(2), one Ta(1), and one Ta(3) atom. In the eleventh O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one La(2), one Ta(2), and one Ta(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_LaZrTa3O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.348
_cell_length_b   6.348
_cell_length_c   12.585
_cell_angle_alpha   89.899
_cell_angle_beta   89.899
_cell_angle_gamma   119.819
_symmetry_Int_Tables_number   1
_cell_volume   440.044
_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
  La  La0  1  0.331  0.669  0.500  1.0
  La  La1  1  0.667  0.333  0.000  1.0
  Zr  Zr2  1  0.000  0.640  0.749  1.0
  Zr  Zr3  1  0.360  1.000  0.251  1.0
  Ta  Ta4  1  0.643  0.997  0.749  1.0
  Ta  Ta5  1  0.358  0.356  0.751  1.0
  Ta  Ta6  1  0.003  0.357  0.251  1.0
  Ta  Ta7  1  0.644  0.642  0.249  1.0
  Ta  Ta8  1  0.330  0.670  0.000  1.0
  Ta  Ta9  1  0.666  0.334  0.500  1.0
  O  O10  1  0.001  0.244  0.750  1.0
  O  O11  1  0.255  0.012  0.749  1.0
  O  O12  1  0.747  0.758  0.750  1.0
  O  O13  1  0.988  0.745  0.251  1.0
  O  O14  1  0.756  0.999  0.250  1.0
  O  O15  1  0.242  0.253  0.250  1.0
  O  O16  1  0.621  0.563  0.405  1.0
  O  O17  1  0.938  0.371  0.404  1.0
  O  O18  1  0.432  0.054  0.415  1.0
  O  O19  1  0.378  0.946  0.086  1.0
  O  O20  1  0.060  0.433  0.096  1.0
  O  O21  1  0.565  0.623  0.094  1.0
  O  O22  1  0.377  0.435  0.906  1.0
  O  O23  1  0.054  0.622  0.914  1.0
  O  O24  1  0.567  0.940  0.904  1.0
  O  O25  1  0.629  0.062  0.596  1.0
  O  O26  1  0.946  0.568  0.585  1.0
  O  O27  1  0.437  0.379  0.595  1.0
  O  O28  1  0.340  0.669  0.709  1.0
  O  O29  1  0.662  0.329  0.791  1.0
  O  O30  1  0.671  0.338  0.209  1.0
  O  O31  1  0.331  0.660  0.291  1.0
[/CIF]
.
The material described by LaZrTa3O11 crystallizes in the monoclinic C2 space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to two equivalent O(10), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. In the second La site, La(2) is bonded in a 8-coordinate geometry to two equivalent O(11), two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms. Zr(1) is bonded to one O(1), one O(10), one O(11), one O(2), one O(3), one O(6), and one O(7) atom to form distorted ZrO7 pentagonal bipyramids that share  a cornercorner with one Ta(3)O6 octahedra and  a cornercorner with one Ta(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-47°. There are four inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(11), one O(2), one O(3), one O(5), and one O(8) atom. In the second Ta site, Ta(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(11), one O(2), one O(3), one O(4), and one O(9) atom. In the third Ta site, Ta(3) is bonded to two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms to form TaO6 octahedra that share corners with two equivalent Zr(1)O7 pentagonal bipyramids. In the fourth Ta site, Ta(4) is bonded to two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms to form TaO6 octahedra that share corners with two equivalent Zr(1)O7 pentagonal bipyramids. There are eleven inequivalent O sites. In the first O site, O(10) is bonded to one La(1), one Zr(1), one Ta(1), and one Ta(2) atom to form distorted corner-sharing OLaZrTa2 tetrahedra. In the second O site, O(11) is bonded to one La(2), one Zr(1), one Ta(1), and one Ta(2) atom to form distorted corner-sharing OLaZrTa2 tetrahedra. In the third O site, O(1) is bonded in a 3-coordinate geometry to one Zr(1), one Ta(1), and one Ta(2) atom. In the fourth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Zr(1), one Ta(1), and one Ta(2) atom. In the fifth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Zr(1), one Ta(1), and one Ta(2) atom. In the sixth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one La(1), one Ta(2), and one Ta(4) atom. In the seventh O site, O(5) is bonded in a 3-coordinate geometry to one La(1), one Ta(1), and one Ta(4) atom. In the eighth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one La(1), one Zr(1), and one Ta(4) atom. In the ninth O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one La(2), one Zr(1), and one Ta(3) atom. In the tenth O site, O(8) is bonded in a 3-coordinate geometry to one La(2), one Ta(1), and one Ta(3) atom. In the eleventh O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one La(2), one Ta(2), and one Ta(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_LaZrTa3O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.348
_cell_length_b   6.348
_cell_length_c   12.585
_cell_angle_alpha   89.899
_cell_angle_beta   89.899
_cell_angle_gamma   119.819
_symmetry_Int_Tables_number   1
_cell_volume   440.044
_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
  La  La0  1  0.331  0.669  0.500  1.0
  La  La1  1  0.667  0.333  0.000  1.0
  Zr  Zr2  1  0.000  0.640  0.749  1.0
  Zr  Zr3  1  0.360  1.000  0.251  1.0
  Ta  Ta4  1  0.643  0.997  0.749  1.0
  Ta  Ta5  1  0.358  0.356  0.751  1.0
  Ta  Ta6  1  0.003  0.357  0.251  1.0
  Ta  Ta7  1  0.644  0.642  0.249  1.0
  Ta  Ta8  1  0.330  0.670  0.000  1.0
  Ta  Ta9  1  0.666  0.334  0.500  1.0
  O  O10  1  0.001  0.244  0.750  1.0
  O  O11  1  0.255  0.012  0.749  1.0
  O  O12  1  0.747  0.758  0.750  1.0
  O  O13  1  0.988  0.745  0.251  1.0
  O  O14  1  0.756  0.999  0.250  1.0
  O  O15  1  0.242  0.253  0.250  1.0
  O  O16  1  0.621  0.563  0.405  1.0
  O  O17  1  0.938  0.371  0.404  1.0
  O  O18  1  0.432  0.054  0.415  1.0
  O  O19  1  0.378  0.946  0.086  1.0
  O  O20  1  0.060  0.433  0.096  1.0
  O  O21  1  0.565  0.623  0.094  1.0
  O  O22  1  0.377  0.435  0.906  1.0
  O  O23  1  0.054  0.622  0.914  1.0
  O  O24  1  0.567  0.940  0.904  1.0
  O  O25  1  0.629  0.062  0.596  1.0
  O  O26  1  0.946  0.568  0.585  1.0
  O  O27  1  0.437  0.379  0.595  1.0
  O  O28  1  0.340  0.669  0.709  1.0
  O  O29  1  0.662  0.329  0.791  1.0
  O  O30  1  0.671  0.338  0.209  1.0
  O  O31  1  0.331  0.660  0.291  1.0
[/CIF]
.