The crystal structure described by ErAl crystallizes in the orthorhombic Pbcm space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 8-coordinate geometry to four equivalent Al(1) and four equivalent Al(2) atoms. In the second Er site, Er(2) is bonded in a 6-coordinate geometry to four equivalent Al(1) and four equivalent Al(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Er(1), four equivalent Er(2), two equivalent Al(1), and two equivalent Al(2) atoms to form a mixture of distorted edge, face, and corner-sharing AlEr8Al4 cuboctahedra. In the second Al site, Al(2) is bonded in a 10-coordinate geometry to four equivalent Er(1), four equivalent Er(2), and two equivalent Al(1) atoms. is represented by the CIF file [CIF]
data_ErAl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.550
_cell_length_b   5.771
_cell_length_c   11.284
_cell_angle_alpha   89.998
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   361.400
_cell_formula_units_Z   8
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
  Er  Er0  1  0.750  0.162  0.484  1.0
  Er  Er1  1  0.250  0.838  0.516  1.0
  Er  Er2  1  0.250  0.162  0.016  1.0
  Er  Er3  1  0.750  0.838  0.984  1.0
  Er  Er4  1  0.750  0.400  0.168  1.0
  Er  Er5  1  0.250  0.600  0.832  1.0
  Er  Er6  1  0.250  0.400  0.332  1.0
  Er  Er7  1  0.750  0.600  0.668  1.0
  Al  Al8  1  0.500  0.931  0.250  1.0
  Al  Al9  1  0.000  0.069  0.750  1.0
  Al  Al10  1  0.500  0.069  0.750  1.0
  Al  Al11  1  1.000  0.931  0.250  1.0
  Al  Al12  1  0.750  0.661  0.402  1.0
  Al  Al13  1  0.250  0.339  0.598  1.0
  Al  Al14  1  0.250  0.661  0.098  1.0
  Al  Al15  1  0.750  0.339  0.902  1.0
[/CIF]
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The crystal structure described by ErAl crystallizes in the orthorhombic Pbcm space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 8-coordinate geometry to four equivalent Al(1) and four equivalent Al(2) atoms. In the second Er site, Er(2) is bonded in a 6-coordinate geometry to four equivalent Al(1) and four equivalent Al(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Er(1), four equivalent Er(2), two equivalent Al(1), and two equivalent Al(2) atoms to form a mixture of distorted edge, face, and corner-sharing AlEr8Al4 cuboctahedra. In the second Al site, Al(2) is bonded in a 10-coordinate geometry to four equivalent Er(1), four equivalent Er(2), and two equivalent Al(1) atoms. is represented by the CIF file [CIF]
data_ErAl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.550
_cell_length_b   5.771
_cell_length_c   11.284
_cell_angle_alpha   89.998
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   361.400
_cell_formula_units_Z   8
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
  Er  Er0  1  0.750  0.162  0.484  1.0
  Er  Er1  1  0.250  0.838  0.516  1.0
  Er  Er2  1  0.250  0.162  0.016  1.0
  Er  Er3  1  0.750  0.838  0.984  1.0
  Er  Er4  1  0.750  0.400  0.168  1.0
  Er  Er5  1  0.250  0.600  0.832  1.0
  Er  Er6  1  0.250  0.400  0.332  1.0
  Er  Er7  1  0.750  0.600  0.668  1.0
  Al  Al8  1  0.500  0.931  0.250  1.0
  Al  Al9  1  0.000  0.069  0.750  1.0
  Al  Al10  1  0.500  0.069  0.750  1.0
  Al  Al11  1  1.000  0.931  0.250  1.0
  Al  Al12  1  0.750  0.661  0.402  1.0
  Al  Al13  1  0.250  0.339  0.598  1.0
  Al  Al14  1  0.250  0.661  0.098  1.0
  Al  Al15  1  0.750  0.339  0.902  1.0
[/CIF]
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