The material described by La2Ni7 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 18-coordinate geometry to three equivalent Ni(3), three equivalent Ni(4), six equivalent Ni(1), and six equivalent Ni(5) atoms. In the second La site, La(2) is bonded in a 12-coordinate geometry to three equivalent Ni(2) and nine equivalent Ni(1) atoms. There are five inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent La(1), three equivalent La(2), one Ni(2), one Ni(3), one Ni(4), and four equivalent Ni(1) atoms to form distorted NiLa5Ni7 cuboctahedra that share corners with two equivalent Ni(2)La6Ni6 cuboctahedra, corners with six equivalent Ni(5)La4Ni8 cuboctahedra, corners with nine equivalent Ni(1)La5Ni7 cuboctahedra, edges with four equivalent Ni(5)La4Ni8 cuboctahedra, edges with four equivalent Ni(1)La5Ni7 cuboctahedra,  a faceface with one Ni(5)La4Ni8 cuboctahedra, faces with three equivalent Ni(2)La6Ni6 cuboctahedra, and faces with ten equivalent Ni(1)La5Ni7 cuboctahedra. In the second Ni site, Ni(2) is bonded to six equivalent La(2) and six equivalent Ni(1) atoms to form NiLa6Ni6 cuboctahedra that share corners with twelve equivalent Ni(1)La5Ni7 cuboctahedra, edges with six equivalent Ni(2)La6Ni6 cuboctahedra, and faces with eighteen equivalent Ni(1)La5Ni7 cuboctahedra. In the third Ni site, Ni(3) is bonded in a 9-coordinate geometry to three equivalent La(1), three equivalent Ni(1), and three equivalent Ni(5) atoms. In the fourth Ni site, Ni(4) is bonded in a 9-coordinate geometry to three equivalent La(1), three equivalent Ni(1), and three equivalent Ni(5) atoms. In the fifth Ni site, Ni(5) is bonded to four equivalent La(1), two equivalent Ni(3), two equivalent Ni(4), and four equivalent Ni(5) atoms to form NiLa4Ni8 cuboctahedra that share corners with four equivalent Ni(5)La4Ni8 cuboctahedra, corners with twelve equivalent Ni(1)La5Ni7 cuboctahedra, edges with two equivalent Ni(5)La4Ni8 cuboctahedra, edges with eight equivalent Ni(1)La5Ni7 cuboctahedra, faces with two equivalent Ni(1)La5Ni7 cuboctahedra, and faces with eight equivalent Ni(5)La4Ni8 cuboctahedra. is represented by the CIF file [CIF]
data_La2Ni7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.983
_cell_length_b   4.983
_cell_length_c   24.470
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   526.183
_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
  La  La0  1  0.333  0.667  0.326  1.0
  La  La1  1  0.667  0.333  0.826  1.0
  La  La2  1  0.667  0.333  0.674  1.0
  La  La3  1  0.333  0.667  0.174  1.0
  La  La4  1  0.333  0.667  0.469  1.0
  La  La5  1  0.667  0.333  0.969  1.0
  La  La6  1  0.667  0.333  0.531  1.0
  La  La7  1  0.333  0.667  0.031  1.0
  Ni  Ni8  1  0.834  0.166  0.412  1.0
  Ni  Ni9  1  0.834  0.668  0.412  1.0
  Ni  Ni10  1  0.332  0.166  0.412  1.0
  Ni  Ni11  1  0.668  0.834  0.912  1.0
  Ni  Ni12  1  0.166  0.332  0.588  1.0
  Ni  Ni13  1  0.166  0.834  0.912  1.0
  Ni  Ni14  1  0.166  0.332  0.912  1.0
  Ni  Ni15  1  0.834  0.166  0.088  1.0
  Ni  Ni16  1  0.000  0.000  0.000  1.0
  Ni  Ni17  1  0.000  0.000  0.500  1.0
  Ni  Ni18  1  0.000  0.000  0.169  1.0
  Ni  Ni19  1  0.000  0.000  0.669  1.0
  Ni  Ni20  1  0.000  0.000  0.831  1.0
  Ni  Ni21  1  0.000  0.000  0.331  1.0
  Ni  Ni22  1  0.333  0.667  0.832  1.0
  Ni  Ni23  1  0.667  0.333  0.332  1.0
  Ni  Ni24  1  0.667  0.333  0.168  1.0
  Ni  Ni25  1  0.333  0.667  0.668  1.0
  Ni  Ni26  1  0.833  0.666  0.250  1.0
  Ni  Ni27  1  0.167  0.833  0.750  1.0
  Ni  Ni28  1  0.666  0.833  0.750  1.0
  Ni  Ni29  1  0.334  0.167  0.250  1.0
  Ni  Ni30  1  0.833  0.167  0.250  1.0
  Ni  Ni31  1  0.167  0.334  0.750  1.0
  Ni  Ni32  1  0.834  0.668  0.088  1.0
  Ni  Ni33  1  0.166  0.834  0.588  1.0
  Ni  Ni34  1  0.668  0.834  0.588  1.0
  Ni  Ni35  1  0.332  0.166  0.088  1.0
[/CIF]
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The material described by La2Ni7 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 18-coordinate geometry to three equivalent Ni(3), three equivalent Ni(4), six equivalent Ni(1), and six equivalent Ni(5) atoms. In the second La site, La(2) is bonded in a 12-coordinate geometry to three equivalent Ni(2) and nine equivalent Ni(1) atoms. There are five inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent La(1), three equivalent La(2), one Ni(2), one Ni(3), one Ni(4), and four equivalent Ni(1) atoms to form distorted NiLa5Ni7 cuboctahedra that share corners with two equivalent Ni(2)La6Ni6 cuboctahedra, corners with six equivalent Ni(5)La4Ni8 cuboctahedra, corners with nine equivalent Ni(1)La5Ni7 cuboctahedra, edges with four equivalent Ni(5)La4Ni8 cuboctahedra, edges with four equivalent Ni(1)La5Ni7 cuboctahedra,  a faceface with one Ni(5)La4Ni8 cuboctahedra, faces with three equivalent Ni(2)La6Ni6 cuboctahedra, and faces with ten equivalent Ni(1)La5Ni7 cuboctahedra. In the second Ni site, Ni(2) is bonded to six equivalent La(2) and six equivalent Ni(1) atoms to form NiLa6Ni6 cuboctahedra that share corners with twelve equivalent Ni(1)La5Ni7 cuboctahedra, edges with six equivalent Ni(2)La6Ni6 cuboctahedra, and faces with eighteen equivalent Ni(1)La5Ni7 cuboctahedra. In the third Ni site, Ni(3) is bonded in a 9-coordinate geometry to three equivalent La(1), three equivalent Ni(1), and three equivalent Ni(5) atoms. In the fourth Ni site, Ni(4) is bonded in a 9-coordinate geometry to three equivalent La(1), three equivalent Ni(1), and three equivalent Ni(5) atoms. In the fifth Ni site, Ni(5) is bonded to four equivalent La(1), two equivalent Ni(3), two equivalent Ni(4), and four equivalent Ni(5) atoms to form NiLa4Ni8 cuboctahedra that share corners with four equivalent Ni(5)La4Ni8 cuboctahedra, corners with twelve equivalent Ni(1)La5Ni7 cuboctahedra, edges with two equivalent Ni(5)La4Ni8 cuboctahedra, edges with eight equivalent Ni(1)La5Ni7 cuboctahedra, faces with two equivalent Ni(1)La5Ni7 cuboctahedra, and faces with eight equivalent Ni(5)La4Ni8 cuboctahedra. is represented by the CIF file [CIF]
data_La2Ni7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.983
_cell_length_b   4.983
_cell_length_c   24.470
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   526.183
_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
  La  La0  1  0.333  0.667  0.326  1.0
  La  La1  1  0.667  0.333  0.826  1.0
  La  La2  1  0.667  0.333  0.674  1.0
  La  La3  1  0.333  0.667  0.174  1.0
  La  La4  1  0.333  0.667  0.469  1.0
  La  La5  1  0.667  0.333  0.969  1.0
  La  La6  1  0.667  0.333  0.531  1.0
  La  La7  1  0.333  0.667  0.031  1.0
  Ni  Ni8  1  0.834  0.166  0.412  1.0
  Ni  Ni9  1  0.834  0.668  0.412  1.0
  Ni  Ni10  1  0.332  0.166  0.412  1.0
  Ni  Ni11  1  0.668  0.834  0.912  1.0
  Ni  Ni12  1  0.166  0.332  0.588  1.0
  Ni  Ni13  1  0.166  0.834  0.912  1.0
  Ni  Ni14  1  0.166  0.332  0.912  1.0
  Ni  Ni15  1  0.834  0.166  0.088  1.0
  Ni  Ni16  1  0.000  0.000  0.000  1.0
  Ni  Ni17  1  0.000  0.000  0.500  1.0
  Ni  Ni18  1  0.000  0.000  0.169  1.0
  Ni  Ni19  1  0.000  0.000  0.669  1.0
  Ni  Ni20  1  0.000  0.000  0.831  1.0
  Ni  Ni21  1  0.000  0.000  0.331  1.0
  Ni  Ni22  1  0.333  0.667  0.832  1.0
  Ni  Ni23  1  0.667  0.333  0.332  1.0
  Ni  Ni24  1  0.667  0.333  0.168  1.0
  Ni  Ni25  1  0.333  0.667  0.668  1.0
  Ni  Ni26  1  0.833  0.666  0.250  1.0
  Ni  Ni27  1  0.167  0.833  0.750  1.0
  Ni  Ni28  1  0.666  0.833  0.750  1.0
  Ni  Ni29  1  0.334  0.167  0.250  1.0
  Ni  Ni30  1  0.833  0.167  0.250  1.0
  Ni  Ni31  1  0.167  0.334  0.750  1.0
  Ni  Ni32  1  0.834  0.668  0.088  1.0
  Ni  Ni33  1  0.166  0.834  0.588  1.0
  Ni  Ni34  1  0.668  0.834  0.588  1.0
  Ni  Ni35  1  0.332  0.166  0.088  1.0
[/CIF]
.