The material described by NiP4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent P(2), two equivalent P(3), and two equivalent P(4) atoms to form NiP6 octahedra that share corners with two equivalent P(1)Ni2P2 tetrahedra, corners with two equivalent P(2)Ni2P2 tetrahedra, corners with two equivalent P(4)Ni2P2 tetrahedra, corners with four equivalent P(5)NiP3 tetrahedra, corners with four equivalent P(6)NiP3 tetrahedra, and edges with two equivalent Ni(2)P6 octahedra. In the second Ni site, Ni(2) is bonded to one P(2), one P(4), one P(5), one P(6), and two equivalent P(1) atoms to form NiP6 octahedra that share corners with two equivalent Ni(2)P6 octahedra,  a cornercorner with one P(1)Ni2P2 tetrahedra, corners with two equivalent P(2)Ni2P2 tetrahedra, corners with two equivalent P(4)Ni2P2 tetrahedra, corners with two equivalent P(5)NiP3 tetrahedra, corners with three equivalent P(6)NiP3 tetrahedra, corners with four equivalent P(3)NiP3 tetrahedra, and  an edgeedge with one Ni(1)P6 octahedra. The corner-sharing octahedral tilt angles are 55°. There are six inequivalent P sites. In the first P site, P(1) is bonded to two equivalent Ni(2), one P(3), and one P(6) atom to form distorted PNi2P2 tetrahedra that share  a cornercorner with one Ni(1)P6 octahedra,  a cornercorner with one Ni(2)P6 octahedra,  a cornercorner with one P(3)NiP3 tetrahedra, corners with two equivalent P(1)Ni2P2 tetrahedra, corners with two equivalent P(2)Ni2P2 tetrahedra, corners with three equivalent P(4)Ni2P2 tetrahedra, corners with three equivalent P(5)NiP3 tetrahedra, and corners with three equivalent P(6)NiP3 tetrahedra. The corner-sharing octahedral tilt angles range from 53-64°. In the second P site, P(2) is bonded to one Ni(1), one Ni(2), one P(4), and one P(5) atom to form distorted PNi2P2 tetrahedra that share  a cornercorner with one Ni(1)P6 octahedra, corners with two equivalent Ni(2)P6 octahedra,  a cornercorner with one P(2)Ni2P2 tetrahedra,  a cornercorner with one P(4)Ni2P2 tetrahedra, corners with two equivalent P(1)Ni2P2 tetrahedra, corners with two equivalent P(5)NiP3 tetrahedra, corners with two equivalent P(6)NiP3 tetrahedra, corners with three equivalent P(3)NiP3 tetrahedra, and  an edgeedge with one P(4)Ni2P2 tetrahedra. The corner-sharing octahedral tilt angles range from 51-66°. In the third P site, P(3) is bonded to one Ni(1), one P(1), one P(5), and one P(6) atom to form distorted PNiP3 tetrahedra that share corners with four equivalent Ni(2)P6 octahedra,  a cornercorner with one P(1)Ni2P2 tetrahedra,  a cornercorner with one P(3)NiP3 tetrahedra,  a cornercorner with one P(5)NiP3 tetrahedra,  a cornercorner with one P(6)NiP3 tetrahedra, corners with three equivalent P(2)Ni2P2 tetrahedra, and corners with three equivalent P(4)Ni2P2 tetrahedra. The corner-sharing octahedral tilt angles range from 42-79°. In the fourth P site, P(4) is bonded to one Ni(1), one Ni(2), one P(2), and one P(6) atom to form distorted PNi2P2 tetrahedra that share  a cornercorner with one Ni(1)P6 octahedra, corners with two equivalent Ni(2)P6 octahedra,  a cornercorner with one P(2)Ni2P2 tetrahedra,  a cornercorner with one P(4)Ni2P2 tetrahedra,  a cornercorner with one P(6)NiP3 tetrahedra, corners with two equivalent P(5)NiP3 tetrahedra, corners with three equivalent P(1)Ni2P2 tetrahedra, corners with three equivalent P(3)NiP3 tetrahedra, and  an edgeedge with one P(2)Ni2P2 tetrahedra. The corner-sharing octahedral tilt angles range from 65-73°. In the fifth P site, P(5) is bonded to one Ni(2), one P(2), one P(3), and one P(5) atom to form distorted PNiP3 tetrahedra that share corners with two equivalent Ni(1)P6 octahedra, corners with two equivalent Ni(2)P6 octahedra,  a cornercorner with one P(3)NiP3 tetrahedra, corners with two equivalent P(2)Ni2P2 tetrahedra, corners with two equivalent P(4)Ni2P2 tetrahedra, corners with two equivalent P(6)NiP3 tetrahedra, and corners with three equivalent P(1)Ni2P2 tetrahedra. The corner-sharing octahedral tilt angles range from 57-66°. In the sixth P site, P(6) is bonded to one Ni(2), one P(1), one P(3), and one P(4) atom to form distorted PNiP3 tetrahedra that share corners with two equivalent Ni(1)P6 octahedra, corners with three equivalent Ni(2)P6 octahedra,  a cornercorner with one P(4)Ni2P2 tetrahedra,  a cornercorner with one P(3)NiP3 tetrahedra, corners with two equivalent P(2)Ni2P2 tetrahedra, corners with two equivalent P(5)NiP3 tetrahedra, and corners with three equivalent P(1)Ni2P2 tetrahedra. The corner-sharing octahedral tilt angles range from 61-78°. is represented by the CIF file [CIF]
data_NiP4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.020
_cell_length_b   4.792
_cell_length_c   7.011
_cell_angle_alpha   78.410
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   461.431
_cell_formula_units_Z   6
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
  Ni  Ni0  1  0.500  0.000  0.500  1.0
  Ni  Ni1  1  0.670  0.860  0.883  1.0
  Ni  Ni2  1  0.000  0.000  0.000  1.0
  Ni  Ni3  1  0.830  0.860  0.383  1.0
  Ni  Ni4  1  0.170  0.140  0.617  1.0
  Ni  Ni5  1  0.330  0.140  0.117  1.0
  P  P6  1  0.272  0.922  0.871  1.0
  P  P7  1  0.228  0.922  0.371  1.0
  P  P8  1  0.052  0.791  0.753  1.0
  P  P9  1  0.385  0.742  0.703  1.0
  P  P10  1  0.448  0.791  0.253  1.0
  P  P11  1  0.607  0.645  0.641  1.0
  P  P12  1  0.946  0.624  0.574  1.0
  P  P13  1  0.782  0.500  0.957  1.0
  P  P14  1  0.115  0.742  0.203  1.0
  P  P15  1  0.893  0.645  0.141  1.0
  P  P16  1  0.282  0.500  0.543  1.0
  P  P17  1  0.554  0.624  0.074  1.0
  P  P18  1  0.446  0.376  0.926  1.0
  P  P19  1  0.718  0.500  0.457  1.0
  P  P20  1  0.107  0.355  0.859  1.0
  P  P21  1  0.885  0.258  0.797  1.0
  P  P22  1  0.218  0.500  0.043  1.0
  P  P23  1  0.054  0.376  0.426  1.0
  P  P24  1  0.393  0.355  0.359  1.0
  P  P25  1  0.552  0.209  0.747  1.0
  P  P26  1  0.615  0.258  0.297  1.0
  P  P27  1  0.948  0.209  0.247  1.0
  P  P28  1  0.772  0.078  0.629  1.0
  P  P29  1  0.728  0.078  0.129  1.0
[/CIF]
.
The material described by NiP4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent P(2), two equivalent P(3), and two equivalent P(4) atoms to form NiP6 octahedra that share corners with two equivalent P(1)Ni2P2 tetrahedra, corners with two equivalent P(2)Ni2P2 tetrahedra, corners with two equivalent P(4)Ni2P2 tetrahedra, corners with four equivalent P(5)NiP3 tetrahedra, corners with four equivalent P(6)NiP3 tetrahedra, and edges with two equivalent Ni(2)P6 octahedra. In the second Ni site, Ni(2) is bonded to one P(2), one P(4), one P(5), one P(6), and two equivalent P(1) atoms to form NiP6 octahedra that share corners with two equivalent Ni(2)P6 octahedra,  a cornercorner with one P(1)Ni2P2 tetrahedra, corners with two equivalent P(2)Ni2P2 tetrahedra, corners with two equivalent P(4)Ni2P2 tetrahedra, corners with two equivalent P(5)NiP3 tetrahedra, corners with three equivalent P(6)NiP3 tetrahedra, corners with four equivalent P(3)NiP3 tetrahedra, and  an edgeedge with one Ni(1)P6 octahedra. The corner-sharing octahedral tilt angles are 55°. There are six inequivalent P sites. In the first P site, P(1) is bonded to two equivalent Ni(2), one P(3), and one P(6) atom to form distorted PNi2P2 tetrahedra that share  a cornercorner with one Ni(1)P6 octahedra,  a cornercorner with one Ni(2)P6 octahedra,  a cornercorner with one P(3)NiP3 tetrahedra, corners with two equivalent P(1)Ni2P2 tetrahedra, corners with two equivalent P(2)Ni2P2 tetrahedra, corners with three equivalent P(4)Ni2P2 tetrahedra, corners with three equivalent P(5)NiP3 tetrahedra, and corners with three equivalent P(6)NiP3 tetrahedra. The corner-sharing octahedral tilt angles range from 53-64°. In the second P site, P(2) is bonded to one Ni(1), one Ni(2), one P(4), and one P(5) atom to form distorted PNi2P2 tetrahedra that share  a cornercorner with one Ni(1)P6 octahedra, corners with two equivalent Ni(2)P6 octahedra,  a cornercorner with one P(2)Ni2P2 tetrahedra,  a cornercorner with one P(4)Ni2P2 tetrahedra, corners with two equivalent P(1)Ni2P2 tetrahedra, corners with two equivalent P(5)NiP3 tetrahedra, corners with two equivalent P(6)NiP3 tetrahedra, corners with three equivalent P(3)NiP3 tetrahedra, and  an edgeedge with one P(4)Ni2P2 tetrahedra. The corner-sharing octahedral tilt angles range from 51-66°. In the third P site, P(3) is bonded to one Ni(1), one P(1), one P(5), and one P(6) atom to form distorted PNiP3 tetrahedra that share corners with four equivalent Ni(2)P6 octahedra,  a cornercorner with one P(1)Ni2P2 tetrahedra,  a cornercorner with one P(3)NiP3 tetrahedra,  a cornercorner with one P(5)NiP3 tetrahedra,  a cornercorner with one P(6)NiP3 tetrahedra, corners with three equivalent P(2)Ni2P2 tetrahedra, and corners with three equivalent P(4)Ni2P2 tetrahedra. The corner-sharing octahedral tilt angles range from 42-79°. In the fourth P site, P(4) is bonded to one Ni(1), one Ni(2), one P(2), and one P(6) atom to form distorted PNi2P2 tetrahedra that share  a cornercorner with one Ni(1)P6 octahedra, corners with two equivalent Ni(2)P6 octahedra,  a cornercorner with one P(2)Ni2P2 tetrahedra,  a cornercorner with one P(4)Ni2P2 tetrahedra,  a cornercorner with one P(6)NiP3 tetrahedra, corners with two equivalent P(5)NiP3 tetrahedra, corners with three equivalent P(1)Ni2P2 tetrahedra, corners with three equivalent P(3)NiP3 tetrahedra, and  an edgeedge with one P(2)Ni2P2 tetrahedra. The corner-sharing octahedral tilt angles range from 65-73°. In the fifth P site, P(5) is bonded to one Ni(2), one P(2), one P(3), and one P(5) atom to form distorted PNiP3 tetrahedra that share corners with two equivalent Ni(1)P6 octahedra, corners with two equivalent Ni(2)P6 octahedra,  a cornercorner with one P(3)NiP3 tetrahedra, corners with two equivalent P(2)Ni2P2 tetrahedra, corners with two equivalent P(4)Ni2P2 tetrahedra, corners with two equivalent P(6)NiP3 tetrahedra, and corners with three equivalent P(1)Ni2P2 tetrahedra. The corner-sharing octahedral tilt angles range from 57-66°. In the sixth P site, P(6) is bonded to one Ni(2), one P(1), one P(3), and one P(4) atom to form distorted PNiP3 tetrahedra that share corners with two equivalent Ni(1)P6 octahedra, corners with three equivalent Ni(2)P6 octahedra,  a cornercorner with one P(4)Ni2P2 tetrahedra,  a cornercorner with one P(3)NiP3 tetrahedra, corners with two equivalent P(2)Ni2P2 tetrahedra, corners with two equivalent P(5)NiP3 tetrahedra, and corners with three equivalent P(1)Ni2P2 tetrahedra. The corner-sharing octahedral tilt angles range from 61-78°. is represented by the CIF file [CIF]
data_NiP4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.020
_cell_length_b   4.792
_cell_length_c   7.011
_cell_angle_alpha   78.410
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   461.431
_cell_formula_units_Z   6
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
  Ni  Ni0  1  0.500  0.000  0.500  1.0
  Ni  Ni1  1  0.670  0.860  0.883  1.0
  Ni  Ni2  1  0.000  0.000  0.000  1.0
  Ni  Ni3  1  0.830  0.860  0.383  1.0
  Ni  Ni4  1  0.170  0.140  0.617  1.0
  Ni  Ni5  1  0.330  0.140  0.117  1.0
  P  P6  1  0.272  0.922  0.871  1.0
  P  P7  1  0.228  0.922  0.371  1.0
  P  P8  1  0.052  0.791  0.753  1.0
  P  P9  1  0.385  0.742  0.703  1.0
  P  P10  1  0.448  0.791  0.253  1.0
  P  P11  1  0.607  0.645  0.641  1.0
  P  P12  1  0.946  0.624  0.574  1.0
  P  P13  1  0.782  0.500  0.957  1.0
  P  P14  1  0.115  0.742  0.203  1.0
  P  P15  1  0.893  0.645  0.141  1.0
  P  P16  1  0.282  0.500  0.543  1.0
  P  P17  1  0.554  0.624  0.074  1.0
  P  P18  1  0.446  0.376  0.926  1.0
  P  P19  1  0.718  0.500  0.457  1.0
  P  P20  1  0.107  0.355  0.859  1.0
  P  P21  1  0.885  0.258  0.797  1.0
  P  P22  1  0.218  0.500  0.043  1.0
  P  P23  1  0.054  0.376  0.426  1.0
  P  P24  1  0.393  0.355  0.359  1.0
  P  P25  1  0.552  0.209  0.747  1.0
  P  P26  1  0.615  0.258  0.297  1.0
  P  P27  1  0.948  0.209  0.247  1.0
  P  P28  1  0.772  0.078  0.629  1.0
  P  P29  1  0.728  0.078  0.129  1.0
[/CIF]
.