The material structure described by EuH2 is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. Eu(1) is bonded in a 9-coordinate geometry to four equivalent H(1) and five equivalent H(2) atoms. There are two inequivalent H sites. In the first H site, H(2) is bonded to five equivalent Eu(1) atoms to form distorted HEu5 square pyramids that share corners with eight equivalent H(2)Eu5 square pyramids, corners with eight equivalent H(1)Eu4 tetrahedra, edges with six equivalent H(2)Eu5 square pyramids, and edges with six equivalent H(1)Eu4 tetrahedra. In the second H site, H(1) is bonded to four equivalent Eu(1) atoms to form HEu4 tetrahedra that share corners with eight equivalent H(2)Eu5 square pyramids, corners with eight equivalent H(1)Eu4 tetrahedra, edges with six equivalent H(2)Eu5 square pyramids, and edges with two equivalent H(1)Eu4 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_EuH2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.726
_cell_length_b   6.122
_cell_length_c   7.102
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   161.993
_cell_formula_units_Z   4
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
  Eu  Eu0  1  0.750  0.258  0.614  1.0
  Eu  Eu1  1  0.750  0.758  0.886  1.0
  Eu  Eu2  1  0.250  0.742  0.386  1.0
  Eu  Eu3  1  0.250  0.242  0.114  1.0
  H  H4  1  0.750  0.144  0.931  1.0
  H  H5  1  0.750  0.644  0.569  1.0
  H  H6  1  0.250  0.856  0.069  1.0
  H  H7  1  0.250  0.356  0.431  1.0
  H  H8  1  0.750  0.531  0.181  1.0
  H  H9  1  0.750  0.031  0.319  1.0
  H  H10  1  0.250  0.469  0.819  1.0
  H  H11  1  0.250  0.969  0.681  1.0
[/CIF]
.
The material structure described by EuH2 is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. Eu(1) is bonded in a 9-coordinate geometry to four equivalent H(1) and five equivalent H(2) atoms. There are two inequivalent H sites. In the first H site, H(2) is bonded to five equivalent Eu(1) atoms to form distorted HEu5 square pyramids that share corners with eight equivalent H(2)Eu5 square pyramids, corners with eight equivalent H(1)Eu4 tetrahedra, edges with six equivalent H(2)Eu5 square pyramids, and edges with six equivalent H(1)Eu4 tetrahedra. In the second H site, H(1) is bonded to four equivalent Eu(1) atoms to form HEu4 tetrahedra that share corners with eight equivalent H(2)Eu5 square pyramids, corners with eight equivalent H(1)Eu4 tetrahedra, edges with six equivalent H(2)Eu5 square pyramids, and edges with two equivalent H(1)Eu4 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_EuH2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.726
_cell_length_b   6.122
_cell_length_c   7.102
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   161.993
_cell_formula_units_Z   4
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
  Eu  Eu0  1  0.750  0.258  0.614  1.0
  Eu  Eu1  1  0.750  0.758  0.886  1.0
  Eu  Eu2  1  0.250  0.742  0.386  1.0
  Eu  Eu3  1  0.250  0.242  0.114  1.0
  H  H4  1  0.750  0.144  0.931  1.0
  H  H5  1  0.750  0.644  0.569  1.0
  H  H6  1  0.250  0.856  0.069  1.0
  H  H7  1  0.250  0.356  0.431  1.0
  H  H8  1  0.750  0.531  0.181  1.0
  H  H9  1  0.750  0.031  0.319  1.0
  H  H10  1  0.250  0.469  0.819  1.0
  H  H11  1  0.250  0.969  0.681  1.0
[/CIF]
.