The crystal structure described by La2Ni9Al crystallizes in the orthorhombic Cmmm space group. La(1) is bonded in a 18-coordinate geometry to two equivalent Ni(2), four equivalent Ni(3), four equivalent Ni(4), six equivalent Ni(1), and two equivalent Al(1) atoms. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to three equivalent La(1), one Ni(2), two equivalent Ni(3), two equivalent Ni(4), and one Al(1) atom. In the second Ni site, Ni(2) is bonded to four equivalent La(1), four equivalent Ni(1), and four equivalent Ni(4) atoms to form NiLa4Ni8 cuboctahedra that share corners with four equivalent Ni(2)La4Ni8 cuboctahedra, corners with eight equivalent Ni(3)La4Al2Ni6 cuboctahedra, edges with two equivalent Ni(2)La4Ni8 cuboctahedra, edges with eight equivalent Ni(3)La4Al2Ni6 cuboctahedra, and faces with eight equivalent Ni(4)La4Ni8 cuboctahedra. In the third Ni site, Ni(3) is bonded to four equivalent La(1), two equivalent Ni(3), four equivalent Ni(1), and two equivalent Al(1) atoms to form distorted NiLa4Al2Ni6 cuboctahedra that share corners with four equivalent Ni(3)La4Al2Ni6 cuboctahedra, corners with four equivalent Ni(2)La4Ni8 cuboctahedra, corners with eight equivalent Ni(4)La4Ni8 cuboctahedra, edges with two equivalent Ni(3)La4Al2Ni6 cuboctahedra, edges with four equivalent Ni(2)La4Ni8 cuboctahedra, edges with four equivalent Ni(4)La4Ni8 cuboctahedra, faces with two equivalent Ni(4)La4Ni8 cuboctahedra, and faces with four equivalent Ni(3)La4Al2Ni6 cuboctahedra. In the fourth Ni site, Ni(4) is bonded to four equivalent La(1), two equivalent Ni(2), two equivalent Ni(4), and four equivalent Ni(1) atoms to form NiLa4Ni8 cuboctahedra that share corners with four equivalent Ni(4)La4Ni8 cuboctahedra, corners with eight equivalent Ni(3)La4Al2Ni6 cuboctahedra, edges with two equivalent Ni(4)La4Ni8 cuboctahedra, edges with four equivalent Ni(3)La4Al2Ni6 cuboctahedra, faces with two equivalent Ni(3)La4Al2Ni6 cuboctahedra, faces with four equivalent Ni(2)La4Ni8 cuboctahedra, and faces with four equivalent Ni(4)La4Ni8 cuboctahedra. Al(1) is bonded in a 8-coordinate geometry to four equivalent La(1), four equivalent Ni(1), and four equivalent Ni(3) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_La2AlNi9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.952
_cell_length_b   4.952
_cell_length_c   7.987
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   119.081
_symmetry_Int_Tables_number   1
_cell_volume   171.157
_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  1.000  0.000  0.015  1.0
  La  La1  1  0.000  1.000  0.485  1.0
  Al  Al2  1  0.500  0.500  0.750  1.0
  Ni  Ni3  1  0.669  0.331  0.000  1.0
  Ni  Ni4  1  0.669  0.331  0.500  1.0
  Ni  Ni5  1  0.500  0.500  0.250  1.0
  Ni  Ni6  1  0.331  0.669  0.000  1.0
  Ni  Ni7  1  0.500  0.000  0.750  1.0
  Ni  Ni8  1  0.000  0.500  0.250  1.0
  Ni  Ni9  1  0.500  0.000  0.250  1.0
  Ni  Ni10  1  0.331  0.669  0.500  1.0
  Ni  Ni11  1  0.000  0.500  0.750  1.0
[/CIF]
.
The crystal structure described by La2Ni9Al crystallizes in the orthorhombic Cmmm space group. La(1) is bonded in a 18-coordinate geometry to two equivalent Ni(2), four equivalent Ni(3), four equivalent Ni(4), six equivalent Ni(1), and two equivalent Al(1) atoms. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to three equivalent La(1), one Ni(2), two equivalent Ni(3), two equivalent Ni(4), and one Al(1) atom. In the second Ni site, Ni(2) is bonded to four equivalent La(1), four equivalent Ni(1), and four equivalent Ni(4) atoms to form NiLa4Ni8 cuboctahedra that share corners with four equivalent Ni(2)La4Ni8 cuboctahedra, corners with eight equivalent Ni(3)La4Al2Ni6 cuboctahedra, edges with two equivalent Ni(2)La4Ni8 cuboctahedra, edges with eight equivalent Ni(3)La4Al2Ni6 cuboctahedra, and faces with eight equivalent Ni(4)La4Ni8 cuboctahedra. In the third Ni site, Ni(3) is bonded to four equivalent La(1), two equivalent Ni(3), four equivalent Ni(1), and two equivalent Al(1) atoms to form distorted NiLa4Al2Ni6 cuboctahedra that share corners with four equivalent Ni(3)La4Al2Ni6 cuboctahedra, corners with four equivalent Ni(2)La4Ni8 cuboctahedra, corners with eight equivalent Ni(4)La4Ni8 cuboctahedra, edges with two equivalent Ni(3)La4Al2Ni6 cuboctahedra, edges with four equivalent Ni(2)La4Ni8 cuboctahedra, edges with four equivalent Ni(4)La4Ni8 cuboctahedra, faces with two equivalent Ni(4)La4Ni8 cuboctahedra, and faces with four equivalent Ni(3)La4Al2Ni6 cuboctahedra. In the fourth Ni site, Ni(4) is bonded to four equivalent La(1), two equivalent Ni(2), two equivalent Ni(4), and four equivalent Ni(1) atoms to form NiLa4Ni8 cuboctahedra that share corners with four equivalent Ni(4)La4Ni8 cuboctahedra, corners with eight equivalent Ni(3)La4Al2Ni6 cuboctahedra, edges with two equivalent Ni(4)La4Ni8 cuboctahedra, edges with four equivalent Ni(3)La4Al2Ni6 cuboctahedra, faces with two equivalent Ni(3)La4Al2Ni6 cuboctahedra, faces with four equivalent Ni(2)La4Ni8 cuboctahedra, and faces with four equivalent Ni(4)La4Ni8 cuboctahedra. Al(1) is bonded in a 8-coordinate geometry to four equivalent La(1), four equivalent Ni(1), and four equivalent Ni(3) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_La2AlNi9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.952
_cell_length_b   4.952
_cell_length_c   7.987
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   119.081
_symmetry_Int_Tables_number   1
_cell_volume   171.157
_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  1.000  0.000  0.015  1.0
  La  La1  1  0.000  1.000  0.485  1.0
  Al  Al2  1  0.500  0.500  0.750  1.0
  Ni  Ni3  1  0.669  0.331  0.000  1.0
  Ni  Ni4  1  0.669  0.331  0.500  1.0
  Ni  Ni5  1  0.500  0.500  0.250  1.0
  Ni  Ni6  1  0.331  0.669  0.000  1.0
  Ni  Ni7  1  0.500  0.000  0.750  1.0
  Ni  Ni8  1  0.000  0.500  0.250  1.0
  Ni  Ni9  1  0.500  0.000  0.250  1.0
  Ni  Ni10  1  0.331  0.669  0.500  1.0
  Ni  Ni11  1  0.000  0.500  0.750  1.0
[/CIF]
.