The crystal structure described by MgHo2V2O7 crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(1), and two equivalent O(5) atoms. Ho(1) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(5) atoms to form distorted HoO6 pentagonal pyramids that share corners with two equivalent V(1)O5 trigonal bipyramids, corners with two equivalent V(2)O5 trigonal bipyramids, edges with three equivalent Ho(1)O6 pentagonal pyramids,  an edgeedge with one V(1)O5 trigonal bipyramid, and  an edgeedge with one V(2)O5 trigonal bipyramid. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(2), one O(3), one O(4), and two equivalent O(1) atoms to form distorted VO5 trigonal bipyramids that share corners with four equivalent Ho(1)O6 pentagonal pyramids,  a cornercorner with one V(2)O5 trigonal bipyramid, edges with two equivalent Ho(1)O6 pentagonal pyramids, and  an edgeedge with one V(2)O5 trigonal bipyramid. In the second V site, V(2) is bonded to one O(2), one O(3), one O(4), and two equivalent O(5) atoms to form VO5 trigonal bipyramids that share corners with four equivalent Ho(1)O6 pentagonal pyramids,  a cornercorner with one V(1)O5 trigonal bipyramid, edges with two equivalent Ho(1)O6 pentagonal pyramids, and  an edgeedge with one V(1)O5 trigonal bipyramid. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), two equivalent Ho(1), and one V(1) atom to form distorted OHo2MgV tetrahedra that share corners with two equivalent O(1)Ho2MgV tetrahedra,  a cornercorner with one O(3)Ho2V2 trigonal pyramid, corners with three equivalent O(2)Ho2V2 trigonal pyramids,  an edgeedge with one O(1)Ho2MgV tetrahedra, and  an edgeedge with one O(3)Ho2V2 trigonal pyramid. In the second O site, O(2) is bonded to two equivalent Ho(1), one V(1), and one V(2) atom to form distorted OHo2V2 trigonal pyramids that share corners with six equivalent O(1)Ho2MgV tetrahedra and edges with two equivalent O(3)Ho2V2 trigonal pyramids. In the third O site, O(3) is bonded to two equivalent Ho(1), one V(1), and one V(2) atom to form OHo2V2 trigonal pyramids that share corners with two equivalent O(1)Ho2MgV tetrahedra, edges with two equivalent O(1)Ho2MgV tetrahedra, and edges with two equivalent O(2)Ho2V2 trigonal pyramids. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one V(1), and one V(2) atom. In the fifth O site, O(5) is bonded in a distorted see-saw-like geometry to one Mg(1), two equivalent Ho(1), and one V(2) atom. is represented by the CIF file [CIF]
data_Ho2MgV2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.884
_cell_length_b   5.884
_cell_length_c   5.518
_cell_angle_alpha   85.743
_cell_angle_beta   94.256
_cell_angle_gamma   68.920
_symmetry_Int_Tables_number   1
_cell_volume   176.684
_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  0.327  0.314  0.502  1.0
  Ho  Ho1  1  0.686  0.673  0.502  1.0
  Mg  Mg2  1  0.056  0.944  0.411  1.0
  V  V3  1  0.259  0.741  0.905  1.0
  V  V4  1  0.727  0.273  0.100  1.0
  O  O5  1  0.057  0.657  0.641  1.0
  O  O6  1  0.343  0.943  0.641  1.0
  O  O7  1  0.434  0.566  0.232  1.0
  O  O8  1  0.562  0.438  0.777  1.0
  O  O9  1  0.018  0.982  0.044  1.0
  O  O10  1  0.654  0.049  0.334  1.0
  O  O11  1  0.951  0.346  0.334  1.0
[/CIF]
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The crystal structure described by MgHo2V2O7 crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(1), and two equivalent O(5) atoms. Ho(1) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(5) atoms to form distorted HoO6 pentagonal pyramids that share corners with two equivalent V(1)O5 trigonal bipyramids, corners with two equivalent V(2)O5 trigonal bipyramids, edges with three equivalent Ho(1)O6 pentagonal pyramids,  an edgeedge with one V(1)O5 trigonal bipyramid, and  an edgeedge with one V(2)O5 trigonal bipyramid. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(2), one O(3), one O(4), and two equivalent O(1) atoms to form distorted VO5 trigonal bipyramids that share corners with four equivalent Ho(1)O6 pentagonal pyramids,  a cornercorner with one V(2)O5 trigonal bipyramid, edges with two equivalent Ho(1)O6 pentagonal pyramids, and  an edgeedge with one V(2)O5 trigonal bipyramid. In the second V site, V(2) is bonded to one O(2), one O(3), one O(4), and two equivalent O(5) atoms to form VO5 trigonal bipyramids that share corners with four equivalent Ho(1)O6 pentagonal pyramids,  a cornercorner with one V(1)O5 trigonal bipyramid, edges with two equivalent Ho(1)O6 pentagonal pyramids, and  an edgeedge with one V(1)O5 trigonal bipyramid. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), two equivalent Ho(1), and one V(1) atom to form distorted OHo2MgV tetrahedra that share corners with two equivalent O(1)Ho2MgV tetrahedra,  a cornercorner with one O(3)Ho2V2 trigonal pyramid, corners with three equivalent O(2)Ho2V2 trigonal pyramids,  an edgeedge with one O(1)Ho2MgV tetrahedra, and  an edgeedge with one O(3)Ho2V2 trigonal pyramid. In the second O site, O(2) is bonded to two equivalent Ho(1), one V(1), and one V(2) atom to form distorted OHo2V2 trigonal pyramids that share corners with six equivalent O(1)Ho2MgV tetrahedra and edges with two equivalent O(3)Ho2V2 trigonal pyramids. In the third O site, O(3) is bonded to two equivalent Ho(1), one V(1), and one V(2) atom to form OHo2V2 trigonal pyramids that share corners with two equivalent O(1)Ho2MgV tetrahedra, edges with two equivalent O(1)Ho2MgV tetrahedra, and edges with two equivalent O(2)Ho2V2 trigonal pyramids. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one V(1), and one V(2) atom. In the fifth O site, O(5) is bonded in a distorted see-saw-like geometry to one Mg(1), two equivalent Ho(1), and one V(2) atom. is represented by the CIF file [CIF]
data_Ho2MgV2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.884
_cell_length_b   5.884
_cell_length_c   5.518
_cell_angle_alpha   85.743
_cell_angle_beta   94.256
_cell_angle_gamma   68.920
_symmetry_Int_Tables_number   1
_cell_volume   176.684
_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  0.327  0.314  0.502  1.0
  Ho  Ho1  1  0.686  0.673  0.502  1.0
  Mg  Mg2  1  0.056  0.944  0.411  1.0
  V  V3  1  0.259  0.741  0.905  1.0
  V  V4  1  0.727  0.273  0.100  1.0
  O  O5  1  0.057  0.657  0.641  1.0
  O  O6  1  0.343  0.943  0.641  1.0
  O  O7  1  0.434  0.566  0.232  1.0
  O  O8  1  0.562  0.438  0.777  1.0
  O  O9  1  0.018  0.982  0.044  1.0
  O  O10  1  0.654  0.049  0.334  1.0
  O  O11  1  0.951  0.346  0.334  1.0
[/CIF]
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