The crystal structure described by PrNi2As2 crystallizes in the tetragonal P4/nmm space group. Pr(1) is bonded in a 16-coordinate geometry to four equivalent Ni(1), four equivalent Ni(2), four equivalent As(1), and four equivalent As(2) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 4-coordinate geometry to four equivalent Pr(1) and four equivalent As(2) atoms. In the second Ni site, Ni(2) is bonded in a 5-coordinate geometry to four equivalent Pr(1), one As(2), and four equivalent As(1) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to four equivalent Pr(1) and four equivalent Ni(2) atoms. In the second As site, As(2) is bonded in a 5-coordinate geometry to four equivalent Pr(1), one Ni(2), and four equivalent Ni(1) atoms. is represented by the CIF file [CIF]
data_Pr(NiAs)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.215
_cell_length_b   4.215
_cell_length_c   9.412
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   167.245
_cell_formula_units_Z   2
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
  Pr  Pr0  1  0.750  0.750  0.248  1.0
  Pr  Pr1  1  0.250  0.250  0.752  1.0
  Ni  Ni2  1  0.750  0.250  0.000  1.0
  Ni  Ni3  1  0.250  0.750  0.000  1.0
  Ni  Ni4  1  0.750  0.750  0.616  1.0
  Ni  Ni5  1  0.250  0.250  0.384  1.0
  As  As6  1  0.750  0.250  0.500  1.0
  As  As7  1  0.250  0.750  0.500  1.0
  As  As8  1  0.750  0.750  0.872  1.0
  As  As9  1  0.250  0.250  0.128  1.0
[/CIF]
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The crystal structure described by PrNi2As2 crystallizes in the tetragonal P4/nmm space group. Pr(1) is bonded in a 16-coordinate geometry to four equivalent Ni(1), four equivalent Ni(2), four equivalent As(1), and four equivalent As(2) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 4-coordinate geometry to four equivalent Pr(1) and four equivalent As(2) atoms. In the second Ni site, Ni(2) is bonded in a 5-coordinate geometry to four equivalent Pr(1), one As(2), and four equivalent As(1) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to four equivalent Pr(1) and four equivalent Ni(2) atoms. In the second As site, As(2) is bonded in a 5-coordinate geometry to four equivalent Pr(1), one Ni(2), and four equivalent Ni(1) atoms. is represented by the CIF file [CIF]
data_Pr(NiAs)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.215
_cell_length_b   4.215
_cell_length_c   9.412
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   167.245
_cell_formula_units_Z   2
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
  Pr  Pr0  1  0.750  0.750  0.248  1.0
  Pr  Pr1  1  0.250  0.250  0.752  1.0
  Ni  Ni2  1  0.750  0.250  0.000  1.0
  Ni  Ni3  1  0.250  0.750  0.000  1.0
  Ni  Ni4  1  0.750  0.750  0.616  1.0
  Ni  Ni5  1  0.250  0.250  0.384  1.0
  As  As6  1  0.750  0.250  0.500  1.0
  As  As7  1  0.250  0.750  0.500  1.0
  As  As8  1  0.750  0.750  0.872  1.0
  As  As9  1  0.250  0.250  0.128  1.0
[/CIF]
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