The material structure described by Mg2Ho2O5 crystallizes in the tetragonal P4/mmm space group. Mg(1) is bonded to one O(2) and four equivalent O(1) atoms to form MgO5 square pyramids that share corners with five equivalent Mg(1)O5 square pyramids and faces with four equivalent Ho(2)O12 cuboctahedra. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a body-centered cubic geometry to eight equivalent O(1) atoms. In the second Ho site, Ho(2) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form HoO12 cuboctahedra that share corners with four equivalent Ho(2)O12 cuboctahedra, faces with four equivalent Ho(2)O12 cuboctahedra, and faces with eight equivalent Mg(1)O5 square pyramids. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Mg(1), two equivalent Ho(1), and two equivalent Ho(2) atoms. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent Mg(1) and four equivalent Ho(2) atoms. is represented by the CIF file [CIF]
data_Ho2Mg2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.864
_cell_length_b   3.864
_cell_length_c   7.200
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   107.479
_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
  Ho  Ho0  1  0.000  0.000  0.000  1.0
  Ho  Ho1  1  0.000  0.000  0.500  1.0
  Mg  Mg2  1  0.500  0.500  0.238  1.0
  Mg  Mg3  1  0.500  0.500  0.762  1.0
  O  O4  1  0.500  0.000  0.198  1.0
  O  O5  1  0.500  0.000  0.802  1.0
  O  O6  1  0.000  0.500  0.198  1.0
  O  O7  1  0.000  0.500  0.802  1.0
  O  O8  1  0.500  0.500  0.500  1.0
[/CIF]
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The material structure described by Mg2Ho2O5 crystallizes in the tetragonal P4/mmm space group. Mg(1) is bonded to one O(2) and four equivalent O(1) atoms to form MgO5 square pyramids that share corners with five equivalent Mg(1)O5 square pyramids and faces with four equivalent Ho(2)O12 cuboctahedra. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a body-centered cubic geometry to eight equivalent O(1) atoms. In the second Ho site, Ho(2) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form HoO12 cuboctahedra that share corners with four equivalent Ho(2)O12 cuboctahedra, faces with four equivalent Ho(2)O12 cuboctahedra, and faces with eight equivalent Mg(1)O5 square pyramids. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Mg(1), two equivalent Ho(1), and two equivalent Ho(2) atoms. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent Mg(1) and four equivalent Ho(2) atoms. is represented by the CIF file [CIF]
data_Ho2Mg2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.864
_cell_length_b   3.864
_cell_length_c   7.200
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   107.479
_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
  Ho  Ho0  1  0.000  0.000  0.000  1.0
  Ho  Ho1  1  0.000  0.000  0.500  1.0
  Mg  Mg2  1  0.500  0.500  0.238  1.0
  Mg  Mg3  1  0.500  0.500  0.762  1.0
  O  O4  1  0.500  0.000  0.198  1.0
  O  O5  1  0.500  0.000  0.802  1.0
  O  O6  1  0.000  0.500  0.198  1.0
  O  O7  1  0.000  0.500  0.802  1.0
  O  O8  1  0.500  0.500  0.500  1.0
[/CIF]
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