The material described by EuH2 crystallizes in the hexagonal P6_3/mmc space group. Eu(1) is bonded in a 11-coordinate geometry to five equivalent H(1) and six equivalent H(2) atoms. There are two inequivalent H sites. In the first H site, H(1) is bonded to five equivalent Eu(1) atoms to form HEu5 trigonal bipyramids that share corners with twelve equivalent H(2)Eu6 octahedra, corners with eight equivalent H(1)Eu5 trigonal bipyramids, edges with six equivalent H(1)Eu5 trigonal bipyramids, and faces with six equivalent H(2)Eu6 octahedra. The corner-sharing octahedral tilt angles range from 31-59°. In the second H site, H(2) is bonded to six equivalent Eu(1) atoms to form HEu6 octahedra that share corners with twelve equivalent H(2)Eu6 octahedra, corners with twelve equivalent H(1)Eu5 trigonal bipyramids, edges with six equivalent H(2)Eu6 octahedra, faces with two equivalent H(2)Eu6 octahedra, and faces with six equivalent H(1)Eu5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 51°. is represented by the Crystallographic Information File (CIF) [CIF]
data_EuH2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.001
_cell_length_b   4.001
_cell_length_c   5.483
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   75.993
_cell_formula_units_Z   2
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  0.667  0.333  0.750  1.0
  Eu  Eu1  1  0.333  0.667  0.250  1.0
  H  H2  1  0.333  0.667  0.750  1.0
  H  H3  1  0.667  0.333  0.250  1.0
  H  H4  1  0.000  0.000  0.500  1.0
  H  H5  1  0.000  0.000  0.000  1.0
[/CIF]
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The material described by EuH2 crystallizes in the hexagonal P6_3/mmc space group. Eu(1) is bonded in a 11-coordinate geometry to five equivalent H(1) and six equivalent H(2) atoms. There are two inequivalent H sites. In the first H site, H(1) is bonded to five equivalent Eu(1) atoms to form HEu5 trigonal bipyramids that share corners with twelve equivalent H(2)Eu6 octahedra, corners with eight equivalent H(1)Eu5 trigonal bipyramids, edges with six equivalent H(1)Eu5 trigonal bipyramids, and faces with six equivalent H(2)Eu6 octahedra. The corner-sharing octahedral tilt angles range from 31-59°. In the second H site, H(2) is bonded to six equivalent Eu(1) atoms to form HEu6 octahedra that share corners with twelve equivalent H(2)Eu6 octahedra, corners with twelve equivalent H(1)Eu5 trigonal bipyramids, edges with six equivalent H(2)Eu6 octahedra, faces with two equivalent H(2)Eu6 octahedra, and faces with six equivalent H(1)Eu5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 51°. is represented by the Crystallographic Information File (CIF) [CIF]
data_EuH2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.001
_cell_length_b   4.001
_cell_length_c   5.483
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   75.993
_cell_formula_units_Z   2
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  0.667  0.333  0.750  1.0
  Eu  Eu1  1  0.333  0.667  0.250  1.0
  H  H2  1  0.333  0.667  0.750  1.0
  H  H3  1  0.667  0.333  0.250  1.0
  H  H4  1  0.000  0.000  0.500  1.0
  H  H5  1  0.000  0.000  0.000  1.0
[/CIF]
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