The material described by Pr2NiCuAl2 crystallizes in the monoclinic Pm space group. There are six inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 5-coordinate geometry to one Ni(2), two equivalent Ni(3), two equivalent Cu(3), two equivalent Al(1), two equivalent Al(3), and two equivalent Al(6) atoms. In the second Pr site, Pr(2) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Cu(1), two equivalent Cu(2), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(5) atoms. In the third Pr site, Pr(3) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Ni(3), two equivalent Cu(2), two equivalent Al(2), two equivalent Al(3), and two equivalent Al(5) atoms. In the fourth Pr site, Pr(4) is bonded in a 5-coordinate geometry to one Ni(2), two equivalent Cu(1), two equivalent Cu(3), two equivalent Al(1), two equivalent Al(4), and two equivalent Al(6) atoms. In the fifth Pr site, Pr(5) is bonded in a 5-coordinate geometry to one Ni(2), two equivalent Ni(3), two equivalent Cu(2), two equivalent Al(1), two equivalent Al(3), and two equivalent Al(5) atoms. In the sixth Pr site, Pr(6) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Cu(1), two equivalent Cu(3), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(6) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted q6 geometry to one Pr(2), one Pr(3), one Pr(6), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(5) atoms. In the second Ni site, Ni(2) is bonded in a distorted q6 geometry to one Pr(1), one Pr(4), one Pr(5), two equivalent Al(1), two equivalent Al(3), and two equivalent Al(6) atoms. In the third Ni site, Ni(3) is bonded in a 9-coordinate geometry to two equivalent Pr(1), two equivalent Pr(3), two equivalent Pr(5), one Al(1), one Al(3), and one Al(5) atom. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 9-coordinate geometry to two equivalent Pr(2), two equivalent Pr(4), two equivalent Pr(6), one Al(2), one Al(4), and one Al(6) atom. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to two equivalent Pr(2), two equivalent Pr(3), two equivalent Pr(5), one Al(2), one Al(3), and one Al(5) atom. In the third Cu site, Cu(3) is bonded in a 9-coordinate geometry to two equivalent Pr(1), two equivalent Pr(4), two equivalent Pr(6), one Al(1), one Al(4), and one Al(6) atom. There are six inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent Pr(1), two equivalent Pr(4), two equivalent Pr(5), one Ni(3), two equivalent Ni(2), one Cu(3), one Al(3), and one Al(6) atom to form distorted AlPr6Al2CuNi3 cuboctahedra that share corners with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra, corners with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra,  a faceface with one Al(4)Pr6Al2Cu2Ni2 cuboctahedra,  a faceface with one Al(5)Pr6Al2CuNi3 cuboctahedra, and faces with two equivalent Al(1)Pr6Al2CuNi3 cuboctahedra. In the second Al site, Al(2) is bonded to two equivalent Pr(2), two equivalent Pr(3), two equivalent Pr(6), two equivalent Ni(1), one Cu(1), one Cu(2), one Al(4), and one Al(5) atom to form distorted AlPr6Al2Cu2Ni2 cuboctahedra that share corners with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra, corners with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra, edges with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra, edges with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra, faces with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, faces with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra, and faces with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra. In the third Al site, Al(3) is bonded in a 12-coordinate geometry to two equivalent Pr(1), two equivalent Pr(3), two equivalent Pr(5), one Ni(3), two equivalent Ni(2), one Cu(2), one Al(1), and one Al(6) atom. In the fourth Al site, Al(4) is bonded to two equivalent Pr(2), two equivalent Pr(4), two equivalent Pr(6), two equivalent Ni(1), one Cu(1), one Cu(3), one Al(2), and one Al(5) atom to form distorted AlPr6Al2Cu2Ni2 cuboctahedra that share corners with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, corners with two equivalent Al(1)Pr6Al2CuNi3 cuboctahedra, edges with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, edges with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra,  a faceface with one Al(1)Pr6Al2CuNi3 cuboctahedra,  a faceface with one Al(5)Pr6Al2CuNi3 cuboctahedra, faces with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, and faces with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra. In the fifth Al site, Al(5) is bonded to two equivalent Pr(2), two equivalent Pr(3), two equivalent Pr(5), one Ni(3), two equivalent Ni(1), one Cu(2), one Al(2), and one Al(4) atom to form distorted AlPr6Al2CuNi3 cuboctahedra that share corners with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, corners with two equivalent Al(1)Pr6Al2CuNi3 cuboctahedra, edges with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, edges with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra,  a faceface with one Al(4)Pr6Al2Cu2Ni2 cuboctahedra,  a faceface with one Al(1)Pr6Al2CuNi3 cuboctahedra, faces with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, and faces with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra. In the sixth Al site, Al(6) is bonded in a 12-coordinate geometry to two equivalent Pr(1), two equivalent Pr(4), two equivalent Pr(6), two equivalent Ni(2), one Cu(1), one Cu(3), one Al(1), and one Al(3) atom. is represented by the CIF card [CIF]
data_Pr2Al2CuNi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.240
_cell_length_b   7.173
_cell_length_c   12.080
_cell_angle_alpha   89.890
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   367.365
_cell_formula_units_Z   3
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  0.500  0.084  0.496  1.0
  Pr  Pr1  1  0.500  0.588  0.001  1.0
  Pr  Pr2  1  0.500  0.200  0.210  1.0
  Pr  Pr3  1  0.500  0.709  0.707  1.0
  Pr  Pr4  1  0.500  0.715  0.294  1.0
  Pr  Pr5  1  0.500  0.207  0.793  1.0
  Al  Al6  1  0.000  0.724  0.498  1.0
  Al  Al7  1  0.000  0.223  0.000  1.0
  Al  Al8  1  0.000  0.386  0.388  1.0
  Al  Al9  1  0.000  0.889  0.889  1.0
  Al  Al10  1  0.000  0.891  0.114  1.0
  Al  Al11  1  0.000  0.388  0.611  1.0
  Cu  Cu12  1  0.000  0.498  0.833  1.0
  Cu  Cu13  1  0.000  0.497  0.169  1.0
  Cu  Cu14  1  0.000  0.000  0.666  1.0
  Ni  Ni15  1  0.500  0.001  1.000  1.0
  Ni  Ni16  1  0.500  0.501  0.500  1.0
  Ni  Ni17  1  0.000  0.998  0.332  1.0
[/CIF]
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The material described by Pr2NiCuAl2 crystallizes in the monoclinic Pm space group. There are six inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 5-coordinate geometry to one Ni(2), two equivalent Ni(3), two equivalent Cu(3), two equivalent Al(1), two equivalent Al(3), and two equivalent Al(6) atoms. In the second Pr site, Pr(2) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Cu(1), two equivalent Cu(2), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(5) atoms. In the third Pr site, Pr(3) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Ni(3), two equivalent Cu(2), two equivalent Al(2), two equivalent Al(3), and two equivalent Al(5) atoms. In the fourth Pr site, Pr(4) is bonded in a 5-coordinate geometry to one Ni(2), two equivalent Cu(1), two equivalent Cu(3), two equivalent Al(1), two equivalent Al(4), and two equivalent Al(6) atoms. In the fifth Pr site, Pr(5) is bonded in a 5-coordinate geometry to one Ni(2), two equivalent Ni(3), two equivalent Cu(2), two equivalent Al(1), two equivalent Al(3), and two equivalent Al(5) atoms. In the sixth Pr site, Pr(6) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Cu(1), two equivalent Cu(3), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(6) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted q6 geometry to one Pr(2), one Pr(3), one Pr(6), two equivalent Al(2), two equivalent Al(4), and two equivalent Al(5) atoms. In the second Ni site, Ni(2) is bonded in a distorted q6 geometry to one Pr(1), one Pr(4), one Pr(5), two equivalent Al(1), two equivalent Al(3), and two equivalent Al(6) atoms. In the third Ni site, Ni(3) is bonded in a 9-coordinate geometry to two equivalent Pr(1), two equivalent Pr(3), two equivalent Pr(5), one Al(1), one Al(3), and one Al(5) atom. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 9-coordinate geometry to two equivalent Pr(2), two equivalent Pr(4), two equivalent Pr(6), one Al(2), one Al(4), and one Al(6) atom. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to two equivalent Pr(2), two equivalent Pr(3), two equivalent Pr(5), one Al(2), one Al(3), and one Al(5) atom. In the third Cu site, Cu(3) is bonded in a 9-coordinate geometry to two equivalent Pr(1), two equivalent Pr(4), two equivalent Pr(6), one Al(1), one Al(4), and one Al(6) atom. There are six inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent Pr(1), two equivalent Pr(4), two equivalent Pr(5), one Ni(3), two equivalent Ni(2), one Cu(3), one Al(3), and one Al(6) atom to form distorted AlPr6Al2CuNi3 cuboctahedra that share corners with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra, corners with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra,  a faceface with one Al(4)Pr6Al2Cu2Ni2 cuboctahedra,  a faceface with one Al(5)Pr6Al2CuNi3 cuboctahedra, and faces with two equivalent Al(1)Pr6Al2CuNi3 cuboctahedra. In the second Al site, Al(2) is bonded to two equivalent Pr(2), two equivalent Pr(3), two equivalent Pr(6), two equivalent Ni(1), one Cu(1), one Cu(2), one Al(4), and one Al(5) atom to form distorted AlPr6Al2Cu2Ni2 cuboctahedra that share corners with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra, corners with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra, edges with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra, edges with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra, faces with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, faces with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra, and faces with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra. In the third Al site, Al(3) is bonded in a 12-coordinate geometry to two equivalent Pr(1), two equivalent Pr(3), two equivalent Pr(5), one Ni(3), two equivalent Ni(2), one Cu(2), one Al(1), and one Al(6) atom. In the fourth Al site, Al(4) is bonded to two equivalent Pr(2), two equivalent Pr(4), two equivalent Pr(6), two equivalent Ni(1), one Cu(1), one Cu(3), one Al(2), and one Al(5) atom to form distorted AlPr6Al2Cu2Ni2 cuboctahedra that share corners with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, corners with two equivalent Al(1)Pr6Al2CuNi3 cuboctahedra, edges with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, edges with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra,  a faceface with one Al(1)Pr6Al2CuNi3 cuboctahedra,  a faceface with one Al(5)Pr6Al2CuNi3 cuboctahedra, faces with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, and faces with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra. In the fifth Al site, Al(5) is bonded to two equivalent Pr(2), two equivalent Pr(3), two equivalent Pr(5), one Ni(3), two equivalent Ni(1), one Cu(2), one Al(2), and one Al(4) atom to form distorted AlPr6Al2CuNi3 cuboctahedra that share corners with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, corners with two equivalent Al(1)Pr6Al2CuNi3 cuboctahedra, edges with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, edges with two equivalent Al(4)Pr6Al2Cu2Ni2 cuboctahedra,  a faceface with one Al(4)Pr6Al2Cu2Ni2 cuboctahedra,  a faceface with one Al(1)Pr6Al2CuNi3 cuboctahedra, faces with two equivalent Al(2)Pr6Al2Cu2Ni2 cuboctahedra, and faces with two equivalent Al(5)Pr6Al2CuNi3 cuboctahedra. In the sixth Al site, Al(6) is bonded in a 12-coordinate geometry to two equivalent Pr(1), two equivalent Pr(4), two equivalent Pr(6), two equivalent Ni(2), one Cu(1), one Cu(3), one Al(1), and one Al(3) atom. is represented by the CIF card [CIF]
data_Pr2Al2CuNi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.240
_cell_length_b   7.173
_cell_length_c   12.080
_cell_angle_alpha   89.890
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   367.365
_cell_formula_units_Z   3
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  0.500  0.084  0.496  1.0
  Pr  Pr1  1  0.500  0.588  0.001  1.0
  Pr  Pr2  1  0.500  0.200  0.210  1.0
  Pr  Pr3  1  0.500  0.709  0.707  1.0
  Pr  Pr4  1  0.500  0.715  0.294  1.0
  Pr  Pr5  1  0.500  0.207  0.793  1.0
  Al  Al6  1  0.000  0.724  0.498  1.0
  Al  Al7  1  0.000  0.223  0.000  1.0
  Al  Al8  1  0.000  0.386  0.388  1.0
  Al  Al9  1  0.000  0.889  0.889  1.0
  Al  Al10  1  0.000  0.891  0.114  1.0
  Al  Al11  1  0.000  0.388  0.611  1.0
  Cu  Cu12  1  0.000  0.498  0.833  1.0
  Cu  Cu13  1  0.000  0.497  0.169  1.0
  Cu  Cu14  1  0.000  0.000  0.666  1.0
  Ni  Ni15  1  0.500  0.001  1.000  1.0
  Ni  Ni16  1  0.500  0.501  0.500  1.0
  Ni  Ni17  1  0.000  0.998  0.332  1.0
[/CIF]
.