The material structure described by U2Ni12P7 crystallizes in the hexagonal P-6 space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 18-coordinate geometry to three equivalent Ni(1), three equivalent Ni(2), six equivalent Ni(3), and six equivalent P(2) atoms. In the second U site, U(2) is bonded in a 15-coordinate geometry to three equivalent Ni(3), six equivalent Ni(1), and six equivalent P(1) atoms. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one U(1), two equivalent U(2), two equivalent P(1), and two equivalent P(2) atoms to form distorted NiU3P4 tetrahedra that share corners with four equivalent Ni(3)U3P4 tetrahedra, corners with four equivalent Ni(2)UP4 tetrahedra, corners with six equivalent Ni(1)U3P4 tetrahedra,  an edgeedge with one Ni(2)UP4 tetrahedra, edges with two equivalent Ni(1)U3P4 tetrahedra, edges with four equivalent Ni(3)U3P4 tetrahedra,  a faceface with one Ni(2)UP4 tetrahedra, faces with two equivalent Ni(1)U3P4 tetrahedra, and faces with two equivalent Ni(3)U3P4 tetrahedra. In the second Ni site, Ni(2) is bonded to one U(1), one P(1), one P(3), and two equivalent P(2) atoms to form distorted NiUP4 tetrahedra that share corners with two equivalent Ni(3)U3P4 tetrahedra, corners with four equivalent Ni(1)U3P4 tetrahedra, corners with six equivalent Ni(2)UP4 tetrahedra,  an edgeedge with one Ni(1)U3P4 tetrahedra, edges with two equivalent Ni(3)U3P4 tetrahedra,  a faceface with one Ni(1)U3P4 tetrahedra, and faces with two equivalent Ni(3)U3P4 tetrahedra. In the third Ni site, Ni(3) is bonded to one U(2), two equivalent U(1), two equivalent P(1), and two equivalent P(2) atoms to form distorted NiU3P4 tetrahedra that share corners with two equivalent Ni(2)UP4 tetrahedra, corners with four equivalent Ni(1)U3P4 tetrahedra, corners with six equivalent Ni(3)U3P4 tetrahedra, edges with two equivalent Ni(3)U3P4 tetrahedra, edges with two equivalent Ni(2)UP4 tetrahedra, edges with four equivalent Ni(1)U3P4 tetrahedra, faces with two equivalent Ni(1)U3P4 tetrahedra, faces with two equivalent Ni(3)U3P4 tetrahedra, and faces with two equivalent Ni(2)UP4 tetrahedra. In the fourth Ni site, Ni(4) is bonded in a 5-coordinate geometry to one P(2), two equivalent P(1), and two equivalent P(3) atoms. There are three inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent U(2), one Ni(2), two equivalent Ni(1), two equivalent Ni(3), and two equivalent Ni(4) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent U(1), one Ni(4), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(3) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to three equivalent Ni(2) and six equivalent Ni(4) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_U2Ni12P7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.016
_cell_length_b   9.016
_cell_length_c   3.670
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   119.998
_symmetry_Int_Tables_number   1
_cell_volume   258.338
_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
  U  U0  1  1.000  1.000  0.000  1.0
  U  U1  1  0.333  0.667  0.500  1.0
  Ni  Ni2  1  0.098  0.392  0.000  1.0
  Ni  Ni3  1  0.294  0.902  0.000  1.0
  Ni  Ni4  1  0.608  0.706  0.000  1.0
  Ni  Ni5  1  0.819  0.606  0.000  1.0
  Ni  Ni6  1  0.787  0.181  0.000  1.0
  Ni  Ni7  1  0.394  0.213  0.000  1.0
  Ni  Ni8  1  0.050  0.764  0.500  1.0
  Ni  Ni9  1  0.714  0.950  0.500  1.0
  Ni  Ni10  1  0.236  0.286  0.500  1.0
  Ni  Ni11  1  0.880  0.426  0.500  1.0
  Ni  Ni12  1  0.546  0.120  0.500  1.0
  Ni  Ni13  1  0.575  0.454  0.500  1.0
  P  P14  1  0.073  0.629  0.000  1.0
  P  P15  1  0.555  0.927  0.000  1.0
  P  P16  1  0.371  0.445  0.000  1.0
  P  P17  1  0.777  0.736  0.500  1.0
  P  P18  1  0.959  0.223  0.500  1.0
  P  P19  1  0.264  0.041  0.500  1.0
  P  P20  1  0.667  0.333  0.000  1.0
[/CIF]
.
The material structure described by U2Ni12P7 crystallizes in the hexagonal P-6 space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 18-coordinate geometry to three equivalent Ni(1), three equivalent Ni(2), six equivalent Ni(3), and six equivalent P(2) atoms. In the second U site, U(2) is bonded in a 15-coordinate geometry to three equivalent Ni(3), six equivalent Ni(1), and six equivalent P(1) atoms. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one U(1), two equivalent U(2), two equivalent P(1), and two equivalent P(2) atoms to form distorted NiU3P4 tetrahedra that share corners with four equivalent Ni(3)U3P4 tetrahedra, corners with four equivalent Ni(2)UP4 tetrahedra, corners with six equivalent Ni(1)U3P4 tetrahedra,  an edgeedge with one Ni(2)UP4 tetrahedra, edges with two equivalent Ni(1)U3P4 tetrahedra, edges with four equivalent Ni(3)U3P4 tetrahedra,  a faceface with one Ni(2)UP4 tetrahedra, faces with two equivalent Ni(1)U3P4 tetrahedra, and faces with two equivalent Ni(3)U3P4 tetrahedra. In the second Ni site, Ni(2) is bonded to one U(1), one P(1), one P(3), and two equivalent P(2) atoms to form distorted NiUP4 tetrahedra that share corners with two equivalent Ni(3)U3P4 tetrahedra, corners with four equivalent Ni(1)U3P4 tetrahedra, corners with six equivalent Ni(2)UP4 tetrahedra,  an edgeedge with one Ni(1)U3P4 tetrahedra, edges with two equivalent Ni(3)U3P4 tetrahedra,  a faceface with one Ni(1)U3P4 tetrahedra, and faces with two equivalent Ni(3)U3P4 tetrahedra. In the third Ni site, Ni(3) is bonded to one U(2), two equivalent U(1), two equivalent P(1), and two equivalent P(2) atoms to form distorted NiU3P4 tetrahedra that share corners with two equivalent Ni(2)UP4 tetrahedra, corners with four equivalent Ni(1)U3P4 tetrahedra, corners with six equivalent Ni(3)U3P4 tetrahedra, edges with two equivalent Ni(3)U3P4 tetrahedra, edges with two equivalent Ni(2)UP4 tetrahedra, edges with four equivalent Ni(1)U3P4 tetrahedra, faces with two equivalent Ni(1)U3P4 tetrahedra, faces with two equivalent Ni(3)U3P4 tetrahedra, and faces with two equivalent Ni(2)UP4 tetrahedra. In the fourth Ni site, Ni(4) is bonded in a 5-coordinate geometry to one P(2), two equivalent P(1), and two equivalent P(3) atoms. There are three inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent U(2), one Ni(2), two equivalent Ni(1), two equivalent Ni(3), and two equivalent Ni(4) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent U(1), one Ni(4), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(3) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to three equivalent Ni(2) and six equivalent Ni(4) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_U2Ni12P7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.016
_cell_length_b   9.016
_cell_length_c   3.670
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   119.998
_symmetry_Int_Tables_number   1
_cell_volume   258.338
_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
  U  U0  1  1.000  1.000  0.000  1.0
  U  U1  1  0.333  0.667  0.500  1.0
  Ni  Ni2  1  0.098  0.392  0.000  1.0
  Ni  Ni3  1  0.294  0.902  0.000  1.0
  Ni  Ni4  1  0.608  0.706  0.000  1.0
  Ni  Ni5  1  0.819  0.606  0.000  1.0
  Ni  Ni6  1  0.787  0.181  0.000  1.0
  Ni  Ni7  1  0.394  0.213  0.000  1.0
  Ni  Ni8  1  0.050  0.764  0.500  1.0
  Ni  Ni9  1  0.714  0.950  0.500  1.0
  Ni  Ni10  1  0.236  0.286  0.500  1.0
  Ni  Ni11  1  0.880  0.426  0.500  1.0
  Ni  Ni12  1  0.546  0.120  0.500  1.0
  Ni  Ni13  1  0.575  0.454  0.500  1.0
  P  P14  1  0.073  0.629  0.000  1.0
  P  P15  1  0.555  0.927  0.000  1.0
  P  P16  1  0.371  0.445  0.000  1.0
  P  P17  1  0.777  0.736  0.500  1.0
  P  P18  1  0.959  0.223  0.500  1.0
  P  P19  1  0.264  0.041  0.500  1.0
  P  P20  1  0.667  0.333  0.000  1.0
[/CIF]
.