The structure described by Er2Cu3Si is hexagonal omega structure-derived structured and crystallizes in the orthorhombic Pmm2 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded to two equivalent Cu(3), four equivalent Cu(1), four equivalent Cu(2), and two equivalent Si(1) atoms to form ErCu10Si2 cuboctahedra that share edges with four equivalent Er(1)Cu10Si2 cuboctahedra, edges with eight equivalent Er(2)Cu8Si4 cuboctahedra, faces with four equivalent Er(1)Cu10Si2 cuboctahedra, and faces with four equivalent Er(2)Cu8Si4 cuboctahedra. In the second Er site, Er(2) is bonded to two equivalent Cu(1), two equivalent Cu(2), four equivalent Cu(3), and four equivalent Si(1) atoms to form ErCu8Si4 cuboctahedra that share edges with four equivalent Er(2)Cu8Si4 cuboctahedra, edges with eight equivalent Er(1)Cu10Si2 cuboctahedra, faces with four equivalent Er(1)Cu10Si2 cuboctahedra, and faces with four equivalent Er(2)Cu8Si4 cuboctahedra. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 9-coordinate geometry to two equivalent Er(2), four equivalent Er(1), one Cu(2), and two equivalent Cu(3) atoms. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to two equivalent Er(2), four equivalent Er(1), one Cu(1), and two equivalent Si(1) atoms. In the third Cu site, Cu(3) is bonded in a 9-coordinate geometry to two equivalent Er(1), four equivalent Er(2), two equivalent Cu(1), and one Si(1) atom. Si(1) is bonded in a 9-coordinate geometry to two equivalent Er(1), four equivalent Er(2), one Cu(3), and two equivalent Cu(2) atoms. is represented by the CIF card [CIF]
data_Er2Cu3Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.566
_cell_length_b   4.128
_cell_length_c   7.314
_cell_angle_alpha   89.924
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   107.690
_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
  Er  Er0  1  0.000  0.000  0.998  1.0
  Er  Er1  1  0.000  0.500  0.501  1.0
  Cu  Cu2  1  0.500  0.500  0.836  1.0
  Cu  Cu3  1  0.500  0.500  0.173  1.0
  Cu  Cu4  1  0.500  0.000  0.659  1.0
  Si  Si5  1  0.500  1.000  0.332  1.0
[/CIF]
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The structure described by Er2Cu3Si is hexagonal omega structure-derived structured and crystallizes in the orthorhombic Pmm2 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded to two equivalent Cu(3), four equivalent Cu(1), four equivalent Cu(2), and two equivalent Si(1) atoms to form ErCu10Si2 cuboctahedra that share edges with four equivalent Er(1)Cu10Si2 cuboctahedra, edges with eight equivalent Er(2)Cu8Si4 cuboctahedra, faces with four equivalent Er(1)Cu10Si2 cuboctahedra, and faces with four equivalent Er(2)Cu8Si4 cuboctahedra. In the second Er site, Er(2) is bonded to two equivalent Cu(1), two equivalent Cu(2), four equivalent Cu(3), and four equivalent Si(1) atoms to form ErCu8Si4 cuboctahedra that share edges with four equivalent Er(2)Cu8Si4 cuboctahedra, edges with eight equivalent Er(1)Cu10Si2 cuboctahedra, faces with four equivalent Er(1)Cu10Si2 cuboctahedra, and faces with four equivalent Er(2)Cu8Si4 cuboctahedra. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 9-coordinate geometry to two equivalent Er(2), four equivalent Er(1), one Cu(2), and two equivalent Cu(3) atoms. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to two equivalent Er(2), four equivalent Er(1), one Cu(1), and two equivalent Si(1) atoms. In the third Cu site, Cu(3) is bonded in a 9-coordinate geometry to two equivalent Er(1), four equivalent Er(2), two equivalent Cu(1), and one Si(1) atom. Si(1) is bonded in a 9-coordinate geometry to two equivalent Er(1), four equivalent Er(2), one Cu(3), and two equivalent Cu(2) atoms. is represented by the CIF card [CIF]
data_Er2Cu3Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.566
_cell_length_b   4.128
_cell_length_c   7.314
_cell_angle_alpha   89.924
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   107.690
_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
  Er  Er0  1  0.000  0.000  0.998  1.0
  Er  Er1  1  0.000  0.500  0.501  1.0
  Cu  Cu2  1  0.500  0.500  0.836  1.0
  Cu  Cu3  1  0.500  0.500  0.173  1.0
  Cu  Cu4  1  0.500  0.000  0.659  1.0
  Si  Si5  1  0.500  1.000  0.332  1.0
[/CIF]
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