The compound described by CaEu2O3 is Caswellsilverite-like structured and crystallizes in the orthorhombic Cmcm space group. Ca(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form distorted CaO6 pentagonal pyramids that share corners with two equivalent Ca(1)O6 pentagonal pyramids, corners with four equivalent Eu(1)O6 pentagonal pyramids, edges with two equivalent Ca(1)O6 pentagonal pyramids, and edges with ten equivalent Eu(1)O6 pentagonal pyramids. Eu(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form distorted EuO6 pentagonal pyramids that share corners with two equivalent Ca(1)O6 pentagonal pyramids, corners with four equivalent Eu(1)O6 pentagonal pyramids, edges with five equivalent Ca(1)O6 pentagonal pyramids, and edges with seven equivalent Eu(1)O6 pentagonal pyramids. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ca(1) and four equivalent Eu(1) atoms to form a mixture of corner, face, and edge-sharing OCa2Eu4 octahedra. The corner-sharing octahedral tilt angles range from 47-48°. In the second O site, O(2) is bonded to two equivalent Ca(1) and four equivalent Eu(1) atoms to form a mixture of corner, face, and edge-sharing OCa2Eu4 octahedra. The corner-sharing octahedral tilt angles range from 47-48°. is represented by the Crystallographic Information File (CIF) [CIF]
data_CaEu2O3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.002
_cell_length_b   6.002
_cell_length_c   5.995
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.050
_symmetry_Int_Tables_number   1
_cell_volume   186.953
_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
  Ca  Ca0  1  0.836  0.836  0.250  1.0
  Ca  Ca1  1  0.164  0.164  0.750  1.0
  Eu  Eu2  1  0.833  0.500  0.750  1.0
  Eu  Eu3  1  0.500  0.167  0.250  1.0
  Eu  Eu4  1  0.167  0.500  0.250  1.0
  Eu  Eu5  1  0.500  0.833  0.750  1.0
  O  O6  1  0.839  0.161  0.000  1.0
  O  O7  1  0.839  0.161  0.500  1.0
  O  O8  1  0.500  0.500  0.000  1.0
  O  O9  1  0.500  0.500  0.500  1.0
  O  O10  1  0.161  0.839  0.500  1.0
  O  O11  1  0.161  0.839  0.000  1.0
[/CIF]
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The compound described by CaEu2O3 is Caswellsilverite-like structured and crystallizes in the orthorhombic Cmcm space group. Ca(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form distorted CaO6 pentagonal pyramids that share corners with two equivalent Ca(1)O6 pentagonal pyramids, corners with four equivalent Eu(1)O6 pentagonal pyramids, edges with two equivalent Ca(1)O6 pentagonal pyramids, and edges with ten equivalent Eu(1)O6 pentagonal pyramids. Eu(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form distorted EuO6 pentagonal pyramids that share corners with two equivalent Ca(1)O6 pentagonal pyramids, corners with four equivalent Eu(1)O6 pentagonal pyramids, edges with five equivalent Ca(1)O6 pentagonal pyramids, and edges with seven equivalent Eu(1)O6 pentagonal pyramids. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ca(1) and four equivalent Eu(1) atoms to form a mixture of corner, face, and edge-sharing OCa2Eu4 octahedra. The corner-sharing octahedral tilt angles range from 47-48°. In the second O site, O(2) is bonded to two equivalent Ca(1) and four equivalent Eu(1) atoms to form a mixture of corner, face, and edge-sharing OCa2Eu4 octahedra. The corner-sharing octahedral tilt angles range from 47-48°. is represented by the Crystallographic Information File (CIF) [CIF]
data_CaEu2O3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.002
_cell_length_b   6.002
_cell_length_c   5.995
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.050
_symmetry_Int_Tables_number   1
_cell_volume   186.953
_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
  Ca  Ca0  1  0.836  0.836  0.250  1.0
  Ca  Ca1  1  0.164  0.164  0.750  1.0
  Eu  Eu2  1  0.833  0.500  0.750  1.0
  Eu  Eu3  1  0.500  0.167  0.250  1.0
  Eu  Eu4  1  0.167  0.500  0.250  1.0
  Eu  Eu5  1  0.500  0.833  0.750  1.0
  O  O6  1  0.839  0.161  0.000  1.0
  O  O7  1  0.839  0.161  0.500  1.0
  O  O8  1  0.500  0.500  0.000  1.0
  O  O9  1  0.500  0.500  0.500  1.0
  O  O10  1  0.161  0.839  0.500  1.0
  O  O11  1  0.161  0.839  0.000  1.0
[/CIF]
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