The compound described by Pr2Al3Ge crystallizes in the orthorhombic Pmm2 space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to two equivalent Al(3), four equivalent Al(1), four equivalent Al(2), and two equivalent Ge(1) atoms to form PrAl10Ge2 cuboctahedra that share edges with four equivalent Pr(1)Al10Ge2 cuboctahedra, edges with eight equivalent Pr(2)Al8Ge4 cuboctahedra, faces with four equivalent Pr(1)Al10Ge2 cuboctahedra, and faces with four equivalent Pr(2)Al8Ge4 cuboctahedra. In the second Pr site, Pr(2) is bonded to two equivalent Al(1), two equivalent Al(2), four equivalent Al(3), and four equivalent Ge(1) atoms to form PrAl8Ge4 cuboctahedra that share edges with four equivalent Pr(2)Al8Ge4 cuboctahedra, edges with eight equivalent Pr(1)Al10Ge2 cuboctahedra, faces with four equivalent Pr(1)Al10Ge2 cuboctahedra, and faces with four equivalent Pr(2)Al8Ge4 cuboctahedra. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 9-coordinate geometry to two equivalent Pr(2), four equivalent Pr(1), one Al(2), and two equivalent Al(3) atoms. In the second Al site, Al(2) is bonded in a distorted bent 120 degrees geometry to two equivalent Pr(2), four equivalent Pr(1), one Al(1), and two equivalent Ge(1) atoms. In the third Al site, Al(3) is bonded in a distorted single-bond geometry to two equivalent Pr(1), four equivalent Pr(2), two equivalent Al(1), and one Ge(1) atom. Ge(1) is bonded in a distorted trigonal planar geometry to two equivalent Pr(1), four equivalent Pr(2), one Al(3), and two equivalent Al(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Pr2Al3Ge
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.344
_cell_length_b   4.334
_cell_length_c   7.516
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   141.504
_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
  Pr  Pr0  1  0.000  0.500  0.005  1.0
  Pr  Pr1  1  0.000  0.000  0.495  1.0
  Al  Al2  1  0.500  0.000  0.831  1.0
  Al  Al3  1  0.500  0.000  0.167  1.0
  Al  Al4  1  0.500  0.500  0.666  1.0
  Ge  Ge5  1  0.500  0.500  0.336  1.0
[/CIF]
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The compound described by Pr2Al3Ge crystallizes in the orthorhombic Pmm2 space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to two equivalent Al(3), four equivalent Al(1), four equivalent Al(2), and two equivalent Ge(1) atoms to form PrAl10Ge2 cuboctahedra that share edges with four equivalent Pr(1)Al10Ge2 cuboctahedra, edges with eight equivalent Pr(2)Al8Ge4 cuboctahedra, faces with four equivalent Pr(1)Al10Ge2 cuboctahedra, and faces with four equivalent Pr(2)Al8Ge4 cuboctahedra. In the second Pr site, Pr(2) is bonded to two equivalent Al(1), two equivalent Al(2), four equivalent Al(3), and four equivalent Ge(1) atoms to form PrAl8Ge4 cuboctahedra that share edges with four equivalent Pr(2)Al8Ge4 cuboctahedra, edges with eight equivalent Pr(1)Al10Ge2 cuboctahedra, faces with four equivalent Pr(1)Al10Ge2 cuboctahedra, and faces with four equivalent Pr(2)Al8Ge4 cuboctahedra. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 9-coordinate geometry to two equivalent Pr(2), four equivalent Pr(1), one Al(2), and two equivalent Al(3) atoms. In the second Al site, Al(2) is bonded in a distorted bent 120 degrees geometry to two equivalent Pr(2), four equivalent Pr(1), one Al(1), and two equivalent Ge(1) atoms. In the third Al site, Al(3) is bonded in a distorted single-bond geometry to two equivalent Pr(1), four equivalent Pr(2), two equivalent Al(1), and one Ge(1) atom. Ge(1) is bonded in a distorted trigonal planar geometry to two equivalent Pr(1), four equivalent Pr(2), one Al(3), and two equivalent Al(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Pr2Al3Ge
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.344
_cell_length_b   4.334
_cell_length_c   7.516
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   141.504
_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
  Pr  Pr0  1  0.000  0.500  0.005  1.0
  Pr  Pr1  1  0.000  0.000  0.495  1.0
  Al  Al2  1  0.500  0.000  0.831  1.0
  Al  Al3  1  0.500  0.000  0.167  1.0
  Al  Al4  1  0.500  0.500  0.666  1.0
  Ge  Ge5  1  0.500  0.500  0.336  1.0
[/CIF]
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