The material described by La9Ni6O19 crystallizes in the monoclinic C2/m space group. There are five inequivalent La sites. In the first La site, La(1) is bonded in a distorted q6 geometry to one O(7), two equivalent O(4), two equivalent O(5), and four equivalent O(6) atoms. In the second La site, La(2) is bonded in a distorted q6 geometry to two equivalent O(7), four equivalent O(4), and four equivalent O(5) atoms. In the third La site, La(3) is bonded in a 9-coordinate geometry to one O(2), one O(3), two equivalent O(4), two equivalent O(6), and three equivalent O(1) atoms. In the fourth La site, La(4) is bonded in a 9-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. In the fifth La site, La(5) is bonded in a 9-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(1), two equivalent O(4), and two equivalent O(6) atoms to form distorted corner-sharing NiO5 square pyramids. The corner-sharing octahedral tilt angles are 2°. In the second Ni site, Ni(2) is bonded to one O(2), one O(7), two equivalent O(4), and two equivalent O(5) atoms to form NiO6 octahedra that share  a cornercorner with one Ni(2)O6 octahedra and corners with two equivalent Ni(1)O5 square pyramids. The corner-sharing octahedra are not tilted. In the third Ni site, Ni(3) is bonded in a distorted rectangular see-saw-like geometry to one O(3), two equivalent O(5), and two equivalent O(6) atoms. There are seven inequivalent O sites. In the first O site, O(3) is bonded in a 6-coordinate geometry to one La(3), two equivalent La(4), two equivalent La(5), and one Ni(3) atom. In the second O site, O(4) is bonded to one La(1), one La(2), one La(3), one La(5), one Ni(1), and one Ni(2) atom to form a mixture of distorted corner, edge, and face-sharing OLa4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the third O site, O(5) is bonded to one La(1), one La(2), one La(4), one La(5), one Ni(2), and one Ni(3) atom to form a mixture of distorted corner, edge, and face-sharing OLa4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the fourth O site, O(6) is bonded to one La(3), one La(4), two equivalent La(1), one Ni(1), and one Ni(3) atom to form a mixture of distorted corner, edge, and face-sharing OLa4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 2-73°. In the fifth O site, O(7) is bonded to two equivalent La(1), two equivalent La(2), and two equivalent Ni(2) atoms to form a mixture of distorted corner and face-sharing OLa4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 0-61°. In the sixth O site, O(1) is bonded in a 6-coordinate geometry to one La(4), one La(5), three equivalent La(3), and one Ni(1) atom. In the seventh O site, O(2) is bonded in a 6-coordinate geometry to one La(3), two equivalent La(4), two equivalent La(5), and one Ni(2) atom. is represented by the CIF card [CIF]
data_La9Ni6O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.749
_cell_length_b   8.749
_cell_length_c   10.365
_cell_angle_alpha   75.871
_cell_angle_beta   75.871
_cell_angle_gamma   36.751
_symmetry_Int_Tables_number   1
_cell_volume   458.700
_cell_formula_units_Z   1
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  0.155  0.155  0.005  1.0
  La  La1  1  0.845  0.845  0.995  1.0
  La  La2  1  0.500  0.500  0.000  1.0
  La  La3  1  0.233  0.233  0.644  1.0
  La  La4  1  0.892  0.892  0.637  1.0
  La  La5  1  0.555  0.555  0.650  1.0
  La  La6  1  0.767  0.767  0.356  1.0
  La  La7  1  0.445  0.445  0.350  1.0
  La  La8  1  0.108  0.108  0.363  1.0
  Ni  Ni9  1  0.301  0.301  0.175  1.0
  Ni  Ni10  1  0.968  0.968  0.197  1.0
  Ni  Ni11  1  0.641  0.641  0.168  1.0
  Ni  Ni12  1  0.699  0.699  0.825  1.0
  Ni  Ni13  1  0.359  0.359  0.832  1.0
  Ni  Ni14  1  0.032  0.032  0.803  1.0
  O  O15  1  0.243  0.243  0.421  1.0
  O  O16  1  0.940  0.940  0.406  1.0
  O  O17  1  0.608  0.608  0.425  1.0
  O  O18  1  0.757  0.757  0.579  1.0
  O  O19  1  0.392  0.392  0.575  1.0
  O  O20  1  0.060  0.060  0.594  1.0
  O  O21  1  0.142  0.623  0.188  1.0
  O  O22  1  0.798  0.313  0.186  1.0
  O  O23  1  0.473  0.975  0.158  1.0
  O  O24  1  0.975  0.473  0.158  1.0
  O  O25  1  0.623  0.142  0.188  1.0
  O  O26  1  0.313  0.798  0.186  1.0
  O  O27  1  0.858  0.377  0.812  1.0
  O  O28  1  0.527  0.025  0.842  1.0
  O  O29  1  0.202  0.687  0.814  1.0
  O  O30  1  0.025  0.527  0.842  1.0
  O  O31  1  0.687  0.202  0.814  1.0
  O  O32  1  0.377  0.858  0.812  1.0
  O  O33  1  0.000  0.000  0.000  1.0
[/CIF]
.
The material described by La9Ni6O19 crystallizes in the monoclinic C2/m space group. There are five inequivalent La sites. In the first La site, La(1) is bonded in a distorted q6 geometry to one O(7), two equivalent O(4), two equivalent O(5), and four equivalent O(6) atoms. In the second La site, La(2) is bonded in a distorted q6 geometry to two equivalent O(7), four equivalent O(4), and four equivalent O(5) atoms. In the third La site, La(3) is bonded in a 9-coordinate geometry to one O(2), one O(3), two equivalent O(4), two equivalent O(6), and three equivalent O(1) atoms. In the fourth La site, La(4) is bonded in a 9-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. In the fifth La site, La(5) is bonded in a 9-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(1), two equivalent O(4), and two equivalent O(6) atoms to form distorted corner-sharing NiO5 square pyramids. The corner-sharing octahedral tilt angles are 2°. In the second Ni site, Ni(2) is bonded to one O(2), one O(7), two equivalent O(4), and two equivalent O(5) atoms to form NiO6 octahedra that share  a cornercorner with one Ni(2)O6 octahedra and corners with two equivalent Ni(1)O5 square pyramids. The corner-sharing octahedra are not tilted. In the third Ni site, Ni(3) is bonded in a distorted rectangular see-saw-like geometry to one O(3), two equivalent O(5), and two equivalent O(6) atoms. There are seven inequivalent O sites. In the first O site, O(3) is bonded in a 6-coordinate geometry to one La(3), two equivalent La(4), two equivalent La(5), and one Ni(3) atom. In the second O site, O(4) is bonded to one La(1), one La(2), one La(3), one La(5), one Ni(1), and one Ni(2) atom to form a mixture of distorted corner, edge, and face-sharing OLa4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the third O site, O(5) is bonded to one La(1), one La(2), one La(4), one La(5), one Ni(2), and one Ni(3) atom to form a mixture of distorted corner, edge, and face-sharing OLa4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 0-66°. In the fourth O site, O(6) is bonded to one La(3), one La(4), two equivalent La(1), one Ni(1), and one Ni(3) atom to form a mixture of distorted corner, edge, and face-sharing OLa4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 2-73°. In the fifth O site, O(7) is bonded to two equivalent La(1), two equivalent La(2), and two equivalent Ni(2) atoms to form a mixture of distorted corner and face-sharing OLa4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 0-61°. In the sixth O site, O(1) is bonded in a 6-coordinate geometry to one La(4), one La(5), three equivalent La(3), and one Ni(1) atom. In the seventh O site, O(2) is bonded in a 6-coordinate geometry to one La(3), two equivalent La(4), two equivalent La(5), and one Ni(2) atom. is represented by the CIF card [CIF]
data_La9Ni6O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.749
_cell_length_b   8.749
_cell_length_c   10.365
_cell_angle_alpha   75.871
_cell_angle_beta   75.871
_cell_angle_gamma   36.751
_symmetry_Int_Tables_number   1
_cell_volume   458.700
_cell_formula_units_Z   1
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  0.155  0.155  0.005  1.0
  La  La1  1  0.845  0.845  0.995  1.0
  La  La2  1  0.500  0.500  0.000  1.0
  La  La3  1  0.233  0.233  0.644  1.0
  La  La4  1  0.892  0.892  0.637  1.0
  La  La5  1  0.555  0.555  0.650  1.0
  La  La6  1  0.767  0.767  0.356  1.0
  La  La7  1  0.445  0.445  0.350  1.0
  La  La8  1  0.108  0.108  0.363  1.0
  Ni  Ni9  1  0.301  0.301  0.175  1.0
  Ni  Ni10  1  0.968  0.968  0.197  1.0
  Ni  Ni11  1  0.641  0.641  0.168  1.0
  Ni  Ni12  1  0.699  0.699  0.825  1.0
  Ni  Ni13  1  0.359  0.359  0.832  1.0
  Ni  Ni14  1  0.032  0.032  0.803  1.0
  O  O15  1  0.243  0.243  0.421  1.0
  O  O16  1  0.940  0.940  0.406  1.0
  O  O17  1  0.608  0.608  0.425  1.0
  O  O18  1  0.757  0.757  0.579  1.0
  O  O19  1  0.392  0.392  0.575  1.0
  O  O20  1  0.060  0.060  0.594  1.0
  O  O21  1  0.142  0.623  0.188  1.0
  O  O22  1  0.798  0.313  0.186  1.0
  O  O23  1  0.473  0.975  0.158  1.0
  O  O24  1  0.975  0.473  0.158  1.0
  O  O25  1  0.623  0.142  0.188  1.0
  O  O26  1  0.313  0.798  0.186  1.0
  O  O27  1  0.858  0.377  0.812  1.0
  O  O28  1  0.527  0.025  0.842  1.0
  O  O29  1  0.202  0.687  0.814  1.0
  O  O30  1  0.025  0.527  0.842  1.0
  O  O31  1  0.687  0.202  0.814  1.0
  O  O32  1  0.377  0.858  0.812  1.0
  O  O33  1  0.000  0.000  0.000  1.0
[/CIF]
.