The compound described by Er2FeSi4 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 13-coordinate geometry to two equivalent Fe(1), one Si(1), two equivalent Si(3), four equivalent Si(2), and four equivalent Si(4) atoms. In the second Er site, Er(2) is bonded in a 13-coordinate geometry to two equivalent Fe(1), one Si(2), two equivalent Si(4), four equivalent Si(1), and four equivalent Si(3) atoms. Fe(1) is bonded in a 8-coordinate geometry to two equivalent Er(1), two equivalent Er(2), two equivalent Si(1), and two equivalent Si(2) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 8-coordinate geometry to one Er(1), four equivalent Er(2), two equivalent Fe(1), and one Si(3) atom. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to one Er(2), four equivalent Er(1), two equivalent Fe(1), and one Si(4) atom. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Er(1), four equivalent Er(2), one Si(1), and two equivalent Si(4) atoms. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to two equivalent Er(2), four equivalent Er(1), one Si(2), and two equivalent Si(3) atoms. is represented by the CIF card [CIF]
data_Er2FeSi4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.961
_cell_length_b   3.992
_cell_length_c   8.240
_cell_angle_alpha   75.981
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   126.430
_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  0.250  0.894  0.212  1.0
  Er  Er1  1  0.750  0.110  0.780  1.0
  Fe  Fe2  1  0.250  0.251  0.499  1.0
  Si  Si3  1  0.250  0.692  0.616  1.0
  Si  Si4  1  0.750  0.308  0.385  1.0
  Si  Si5  1  0.250  0.539  0.923  1.0
  Si  Si6  1  0.750  0.458  0.085  1.0
[/CIF]
.
The compound described by Er2FeSi4 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 13-coordinate geometry to two equivalent Fe(1), one Si(1), two equivalent Si(3), four equivalent Si(2), and four equivalent Si(4) atoms. In the second Er site, Er(2) is bonded in a 13-coordinate geometry to two equivalent Fe(1), one Si(2), two equivalent Si(4), four equivalent Si(1), and four equivalent Si(3) atoms. Fe(1) is bonded in a 8-coordinate geometry to two equivalent Er(1), two equivalent Er(2), two equivalent Si(1), and two equivalent Si(2) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 8-coordinate geometry to one Er(1), four equivalent Er(2), two equivalent Fe(1), and one Si(3) atom. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to one Er(2), four equivalent Er(1), two equivalent Fe(1), and one Si(4) atom. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Er(1), four equivalent Er(2), one Si(1), and two equivalent Si(4) atoms. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to two equivalent Er(2), four equivalent Er(1), one Si(2), and two equivalent Si(3) atoms. is represented by the CIF card [CIF]
data_Er2FeSi4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.961
_cell_length_b   3.992
_cell_length_c   8.240
_cell_angle_alpha   75.981
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   126.430
_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  0.250  0.894  0.212  1.0
  Er  Er1  1  0.750  0.110  0.780  1.0
  Fe  Fe2  1  0.250  0.251  0.499  1.0
  Si  Si3  1  0.250  0.692  0.616  1.0
  Si  Si4  1  0.750  0.308  0.385  1.0
  Si  Si5  1  0.250  0.539  0.923  1.0
  Si  Si6  1  0.750  0.458  0.085  1.0
[/CIF]
.