The compound described by BaSrV4(NiO4)4 crystallizes in the tetragonal I-4c2 space group. Ba(1) is bonded to four equivalent O(2) and eight equivalent O(4) atoms to form BaO12 cuboctahedra that share corners with four equivalent Ni(2)O6 octahedra, corners with four equivalent V(1)O4 tetrahedra, edges with four equivalent V(1)O4 tetrahedra, faces with two equivalent Ba(1)O12 cuboctahedra, and faces with four equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles are 50°. Sr(1) is bonded to four equivalent O(1) and eight equivalent O(3) atoms to form SrO12 cuboctahedra that share corners with four equivalent Ni(1)O6 octahedra, corners with four equivalent V(1)O4 tetrahedra, edges with four equivalent V(1)O4 tetrahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with four equivalent Ni(2)O6 octahedra. The corner-sharing octahedral tilt angles are 48°. V(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form VO4 tetrahedra that share  a cornercorner with one Ba(1)O12 cuboctahedra,  a cornercorner with one Sr(1)O12 cuboctahedra, corners with three equivalent Ni(1)O6 octahedra, corners with three equivalent Ni(2)O6 octahedra,  an edgeedge with one Ba(1)O12 cuboctahedra, and  an edgeedge with one Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 48-57°. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form NiO6 octahedra that share corners with two equivalent Sr(1)O12 cuboctahedra, corners with six equivalent V(1)O4 tetrahedra, edges with two equivalent Ni(2)O6 octahedra, and faces with two equivalent Ba(1)O12 cuboctahedra. In the second Ni site, Ni(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form NiO6 octahedra that share corners with two equivalent Ba(1)O12 cuboctahedra, corners with six equivalent V(1)O4 tetrahedra, edges with two equivalent Ni(1)O6 octahedra, and faces with two equivalent Sr(1)O12 cuboctahedra. There are four inequivalent O sites. In the first O site, O(3) is bonded in a 2-coordinate geometry to two equivalent Sr(1), one V(1), and one Ni(2) atom. In the second O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Ba(1), one V(1), and one Ni(1) atom. In the third O site, O(1) is bonded in a 3-coordinate geometry to one Sr(1), one V(1), one Ni(1), and one Ni(2) atom. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to one Ba(1), one V(1), one Ni(1), and one Ni(2) atom. is represented by the CIF card [CIF]
data_BaSrV4(NiO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.592
_cell_length_b   9.592
_cell_length_c   9.592
_cell_angle_alpha   100.733
_cell_angle_beta   100.733
_cell_angle_gamma   128.869
_symmetry_Int_Tables_number   1
_cell_volume   619.839
_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
  Ba  Ba0  1  0.250  0.750  0.500  1.0
  Ba  Ba1  1  0.750  0.250  0.500  1.0
  Sr  Sr2  1  0.500  0.500  1.000  1.0
  Sr  Sr3  1  0.000  0.000  0.000  1.0
  V  V4  1  0.044  0.877  0.672  1.0
  V  V5  1  0.705  0.377  0.833  1.0
  V  V6  1  0.544  0.872  0.168  1.0
  V  V7  1  0.205  0.372  0.328  1.0
  V  V8  1  0.123  0.795  0.167  1.0
  V  V9  1  0.623  0.456  0.328  1.0
  V  V10  1  0.128  0.295  0.672  1.0
  V  V11  1  0.628  0.956  0.832  1.0
  Ni  Ni12  1  0.669  0.831  0.500  1.0
  Ni  Ni13  1  0.831  0.331  0.162  1.0
  Ni  Ni14  1  0.417  0.083  0.000  1.0
  Ni  Ni15  1  0.583  0.583  0.665  1.0
  Ni  Ni16  1  0.331  0.169  0.500  1.0
  Ni  Ni17  1  0.169  0.669  0.838  1.0
  Ni  Ni18  1  0.083  0.417  0.000  1.0
  Ni  Ni19  1  0.917  0.917  0.335  1.0
  O  O20  1  0.681  0.670  0.332  1.0
  O  O21  1  0.837  0.170  0.989  1.0
  O  O22  1  0.419  0.904  0.837  1.0
  O  O23  1  0.567  0.404  0.485  1.0
  O  O24  1  0.337  0.349  0.668  1.0
  O  O25  1  0.181  0.849  0.011  1.0
  O  O26  1  0.067  0.582  0.163  1.0
  O  O27  1  0.919  0.082  0.515  1.0
  O  O28  1  0.330  0.663  0.011  1.0
  O  O29  1  0.830  0.819  0.668  1.0
  O  O30  1  0.096  0.933  0.515  1.0
  O  O31  1  0.596  0.081  0.163  1.0
  O  O32  1  0.651  0.319  0.989  1.0
  O  O33  1  0.151  0.163  0.332  1.0
  O  O34  1  0.418  0.581  0.485  1.0
  O  O35  1  0.918  0.433  0.837  1.0
  O  O36  1  0.433  0.272  0.155  1.0
  O  O37  1  0.617  0.772  0.839  1.0
  O  O38  1  0.643  0.974  0.661  1.0
  O  O39  1  0.813  0.474  0.331  1.0
  O  O40  1  0.117  0.278  0.845  1.0
  O  O41  1  0.933  0.778  0.161  1.0
  O  O42  1  0.313  0.982  0.339  1.0
  O  O43  1  0.143  0.482  0.669  1.0
  O  O44  1  0.728  0.883  0.161  1.0
  O  O45  1  0.228  0.067  0.845  1.0
  O  O46  1  0.026  0.687  0.669  1.0
  O  O47  1  0.526  0.857  0.339  1.0
  O  O48  1  0.722  0.567  0.839  1.0
  O  O49  1  0.222  0.383  0.155  1.0
  O  O50  1  0.018  0.357  0.331  1.0
  O  O51  1  0.518  0.187  0.661  1.0
[/CIF]
.
The compound described by BaSrV4(NiO4)4 crystallizes in the tetragonal I-4c2 space group. Ba(1) is bonded to four equivalent O(2) and eight equivalent O(4) atoms to form BaO12 cuboctahedra that share corners with four equivalent Ni(2)O6 octahedra, corners with four equivalent V(1)O4 tetrahedra, edges with four equivalent V(1)O4 tetrahedra, faces with two equivalent Ba(1)O12 cuboctahedra, and faces with four equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles are 50°. Sr(1) is bonded to four equivalent O(1) and eight equivalent O(3) atoms to form SrO12 cuboctahedra that share corners with four equivalent Ni(1)O6 octahedra, corners with four equivalent V(1)O4 tetrahedra, edges with four equivalent V(1)O4 tetrahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with four equivalent Ni(2)O6 octahedra. The corner-sharing octahedral tilt angles are 48°. V(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form VO4 tetrahedra that share  a cornercorner with one Ba(1)O12 cuboctahedra,  a cornercorner with one Sr(1)O12 cuboctahedra, corners with three equivalent Ni(1)O6 octahedra, corners with three equivalent Ni(2)O6 octahedra,  an edgeedge with one Ba(1)O12 cuboctahedra, and  an edgeedge with one Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 48-57°. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form NiO6 octahedra that share corners with two equivalent Sr(1)O12 cuboctahedra, corners with six equivalent V(1)O4 tetrahedra, edges with two equivalent Ni(2)O6 octahedra, and faces with two equivalent Ba(1)O12 cuboctahedra. In the second Ni site, Ni(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form NiO6 octahedra that share corners with two equivalent Ba(1)O12 cuboctahedra, corners with six equivalent V(1)O4 tetrahedra, edges with two equivalent Ni(1)O6 octahedra, and faces with two equivalent Sr(1)O12 cuboctahedra. There are four inequivalent O sites. In the first O site, O(3) is bonded in a 2-coordinate geometry to two equivalent Sr(1), one V(1), and one Ni(2) atom. In the second O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Ba(1), one V(1), and one Ni(1) atom. In the third O site, O(1) is bonded in a 3-coordinate geometry to one Sr(1), one V(1), one Ni(1), and one Ni(2) atom. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to one Ba(1), one V(1), one Ni(1), and one Ni(2) atom. is represented by the CIF card [CIF]
data_BaSrV4(NiO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.592
_cell_length_b   9.592
_cell_length_c   9.592
_cell_angle_alpha   100.733
_cell_angle_beta   100.733
_cell_angle_gamma   128.869
_symmetry_Int_Tables_number   1
_cell_volume   619.839
_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
  Ba  Ba0  1  0.250  0.750  0.500  1.0
  Ba  Ba1  1  0.750  0.250  0.500  1.0
  Sr  Sr2  1  0.500  0.500  1.000  1.0
  Sr  Sr3  1  0.000  0.000  0.000  1.0
  V  V4  1  0.044  0.877  0.672  1.0
  V  V5  1  0.705  0.377  0.833  1.0
  V  V6  1  0.544  0.872  0.168  1.0
  V  V7  1  0.205  0.372  0.328  1.0
  V  V8  1  0.123  0.795  0.167  1.0
  V  V9  1  0.623  0.456  0.328  1.0
  V  V10  1  0.128  0.295  0.672  1.0
  V  V11  1  0.628  0.956  0.832  1.0
  Ni  Ni12  1  0.669  0.831  0.500  1.0
  Ni  Ni13  1  0.831  0.331  0.162  1.0
  Ni  Ni14  1  0.417  0.083  0.000  1.0
  Ni  Ni15  1  0.583  0.583  0.665  1.0
  Ni  Ni16  1  0.331  0.169  0.500  1.0
  Ni  Ni17  1  0.169  0.669  0.838  1.0
  Ni  Ni18  1  0.083  0.417  0.000  1.0
  Ni  Ni19  1  0.917  0.917  0.335  1.0
  O  O20  1  0.681  0.670  0.332  1.0
  O  O21  1  0.837  0.170  0.989  1.0
  O  O22  1  0.419  0.904  0.837  1.0
  O  O23  1  0.567  0.404  0.485  1.0
  O  O24  1  0.337  0.349  0.668  1.0
  O  O25  1  0.181  0.849  0.011  1.0
  O  O26  1  0.067  0.582  0.163  1.0
  O  O27  1  0.919  0.082  0.515  1.0
  O  O28  1  0.330  0.663  0.011  1.0
  O  O29  1  0.830  0.819  0.668  1.0
  O  O30  1  0.096  0.933  0.515  1.0
  O  O31  1  0.596  0.081  0.163  1.0
  O  O32  1  0.651  0.319  0.989  1.0
  O  O33  1  0.151  0.163  0.332  1.0
  O  O34  1  0.418  0.581  0.485  1.0
  O  O35  1  0.918  0.433  0.837  1.0
  O  O36  1  0.433  0.272  0.155  1.0
  O  O37  1  0.617  0.772  0.839  1.0
  O  O38  1  0.643  0.974  0.661  1.0
  O  O39  1  0.813  0.474  0.331  1.0
  O  O40  1  0.117  0.278  0.845  1.0
  O  O41  1  0.933  0.778  0.161  1.0
  O  O42  1  0.313  0.982  0.339  1.0
  O  O43  1  0.143  0.482  0.669  1.0
  O  O44  1  0.728  0.883  0.161  1.0
  O  O45  1  0.228  0.067  0.845  1.0
  O  O46  1  0.026  0.687  0.669  1.0
  O  O47  1  0.526  0.857  0.339  1.0
  O  O48  1  0.722  0.567  0.839  1.0
  O  O49  1  0.222  0.383  0.155  1.0
  O  O50  1  0.018  0.357  0.331  1.0
  O  O51  1  0.518  0.187  0.661  1.0
[/CIF]
.