The compound described by MgZn(NiO2)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(5), one O(7), one O(8), and two equivalent O(3) atoms to form distorted MgO5 square pyramids that share corners with two equivalent Ni(2)O6 octahedra, corners with two equivalent Ni(3)O6 octahedra, corners with two equivalent Mg(1)O5 square pyramids, corners with two equivalent Ni(1)O5 square pyramids, corners with two equivalent Zn(1)O5 trigonal bipyramids, edges with two equivalent Ni(4)O5 square pyramids, and  a faceface with one Ni(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-49°. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(2), two equivalent O(4), and two equivalent O(5) atoms to form NiO5 square pyramids that share corners with two equivalent Ni(2)O6 octahedra, corners with two equivalent Ni(3)O6 octahedra, corners with two equivalent Mg(1)O5 square pyramids, corners with two equivalent Zn(1)O5 trigonal bipyramids, and edges with two equivalent Ni(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 51-52°. In the second Ni site, Ni(2) is bonded to one O(4), one O(8), two equivalent O(3), and two equivalent O(6) atoms to form distorted NiO6 octahedra that share corners with two equivalent Mg(1)O5 square pyramids, corners with two equivalent Ni(1)O5 square pyramids, corners with two equivalent Ni(4)O5 square pyramids, corners with two equivalent Zn(1)O5 trigonal bipyramids, edges with two equivalent Ni(2)O6 octahedra, edges with two equivalent Ni(3)O6 octahedra,  a faceface with one Mg(1)O5 square pyramid, and  a faceface with one Zn(1)O5 trigonal bipyramid. In the third Ni site, Ni(3) is bonded to one O(1), one O(6), two equivalent O(2), and two equivalent O(8) atoms to form NiO6 octahedra that share corners with two equivalent Mg(1)O5 square pyramids, corners with two equivalent Ni(1)O5 square pyramids, corners with two equivalent Ni(4)O5 square pyramids, corners with two equivalent Zn(1)O5 trigonal bipyramids, edges with two equivalent Ni(2)O6 octahedra, and edges with two equivalent Ni(3)O6 octahedra. In the fourth Ni site, Ni(4) is bonded to one O(3), two equivalent O(1), and two equivalent O(7) atoms to form NiO5 square pyramids that share corners with two equivalent Ni(2)O6 octahedra, corners with two equivalent Ni(3)O6 octahedra, corners with two equivalent Zn(1)O5 trigonal bipyramids, edges with two equivalent Mg(1)O5 square pyramids, edges with two equivalent Ni(4)O5 square pyramids, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 51-63°. Zn(1) is bonded to one O(4), two equivalent O(6), and two equivalent O(7) atoms to form distorted ZnO5 trigonal bipyramids that share corners with two equivalent Ni(2)O6 octahedra, corners with two equivalent Ni(3)O6 octahedra, corners with two equivalent Mg(1)O5 square pyramids, corners with two equivalent Ni(1)O5 square pyramids, corners with two equivalent Ni(4)O5 square pyramids,  an edgeedge with one Ni(4)O5 square pyramid, edges with two equivalent Zn(1)O5 trigonal bipyramids, and  a faceface with one Ni(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-60°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Ni(3) and two equivalent Ni(4) atoms. In the second O site, O(2) is bonded in a trigonal planar geometry to one Ni(1) and two equivalent Ni(3) atoms. In the third O site, O(3) is bonded to two equivalent Mg(1), one Ni(4), and two equivalent Ni(2) atoms to form distorted OMg2Ni3 trigonal bipyramids that share corners with two equivalent O(4)ZnNi3 tetrahedra, corners with two equivalent O(6)Zn2Ni3 trigonal bipyramids,  an edgeedge with one O(6)Zn2Ni3 trigonal bipyramid, edges with two equivalent O(3)Mg2Ni3 trigonal bipyramids, edges with two equivalent O(7)MgZn2Ni2 trigonal bipyramids, and edges with two equivalent O(8)MgNi3 trigonal pyramids. In the fourth O site, O(4) is bonded to one Ni(2), two equivalent Ni(1), and one Zn(1) atom to form distorted OZnNi3 tetrahedra that share corners with two equivalent O(4)ZnNi3 tetrahedra, corners with two equivalent O(3)Mg2Ni3 trigonal bipyramids, corners with two equivalent O(7)MgZn2Ni2 trigonal bipyramids,  a cornercorner with one O(8)MgNi3 trigonal pyramid, and edges with two equivalent O(6)Zn2Ni3 trigonal bipyramids. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mg(1) and two equivalent Ni(1) atoms. In the sixth O site, O(6) is bonded to one Ni(3), two equivalent Ni(2), and two equivalent Zn(1) atoms to form distorted OZn2Ni3 trigonal bipyramids that share corners with two equivalent O(3)Mg2Ni3 trigonal bipyramids, corners with two equivalent O(7)MgZn2Ni2 trigonal bipyramids, edges with two equivalent O(4)ZnNi3 tetrahedra,  an edgeedge with one O(3)Mg2Ni3 trigonal bipyramid,  an edgeedge with one O(7)MgZn2Ni2 trigonal bipyramid, edges with two equivalent O(6)Zn2Ni3 trigonal bipyramids, and edges with two equivalent O(8)MgNi3 trigonal pyramids. In the seventh O site, O(7) is bonded to one Mg(1), two equivalent Ni(4), and two equivalent Zn(1) atoms to form OMgZn2Ni2 trigonal bipyramids that share corners with two equivalent O(4)ZnNi3 tetrahedra, corners with two equivalent O(6)Zn2Ni3 trigonal bipyramids,  a cornercorner with one O(8)MgNi3 trigonal pyramid,  an edgeedge with one O(6)Zn2Ni3 trigonal bipyramid, edges with two equivalent O(3)Mg2Ni3 trigonal bipyramids, and edges with two equivalent O(7)MgZn2Ni2 trigonal bipyramids. In the eighth O site, O(8) is bonded to one Mg(1), one Ni(2), and two equivalent Ni(3) atoms to form OMgNi3 trigonal pyramids that share  a cornercorner with one O(4)ZnNi3 tetrahedra,  a cornercorner with one O(7)MgZn2Ni2 trigonal bipyramid, corners with two equivalent O(8)MgNi3 trigonal pyramids, edges with two equivalent O(3)Mg2Ni3 trigonal bipyramids, and edges with two equivalent O(6)Zn2Ni3 trigonal bipyramids. is represented by the CIF card [CIF]
data_MgZn(NiO2)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.901
_cell_length_b   8.014
_cell_length_c   7.210
_cell_angle_alpha   69.246
_cell_angle_beta   78.357
_cell_angle_gamma   79.634
_symmetry_Int_Tables_number   1
_cell_volume   152.443
_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
  Mg  Mg0  1  0.064  0.841  0.029  1.0
  Zn  Zn1  1  0.313  0.153  0.217  1.0
  Ni  Ni2  1  0.583  0.186  0.640  1.0
  Ni  Ni3  1  0.150  0.493  0.201  1.0
  Ni  Ni4  1  0.832  0.497  0.835  1.0
  Ni  Ni5  1  0.397  0.779  0.422  1.0
  O  O6  1  0.883  0.655  0.576  1.0
  O  O7  1  0.422  0.365  0.784  1.0
  O  O8  1  0.558  0.683  0.198  1.0
  O  O9  1  0.132  0.274  0.454  1.0
  O  O10  1  0.074  0.051  0.789  1.0
  O  O11  1  0.768  0.347  0.111  1.0
  O  O12  1  0.888  0.960  0.262  1.0
  O  O13  1  0.233  0.627  0.903  1.0
[/CIF]
.
The compound described by MgZn(NiO2)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(5), one O(7), one O(8), and two equivalent O(3) atoms to form distorted MgO5 square pyramids that share corners with two equivalent Ni(2)O6 octahedra, corners with two equivalent Ni(3)O6 octahedra, corners with two equivalent Mg(1)O5 square pyramids, corners with two equivalent Ni(1)O5 square pyramids, corners with two equivalent Zn(1)O5 trigonal bipyramids, edges with two equivalent Ni(4)O5 square pyramids, and  a faceface with one Ni(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-49°. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(2), two equivalent O(4), and two equivalent O(5) atoms to form NiO5 square pyramids that share corners with two equivalent Ni(2)O6 octahedra, corners with two equivalent Ni(3)O6 octahedra, corners with two equivalent Mg(1)O5 square pyramids, corners with two equivalent Zn(1)O5 trigonal bipyramids, and edges with two equivalent Ni(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 51-52°. In the second Ni site, Ni(2) is bonded to one O(4), one O(8), two equivalent O(3), and two equivalent O(6) atoms to form distorted NiO6 octahedra that share corners with two equivalent Mg(1)O5 square pyramids, corners with two equivalent Ni(1)O5 square pyramids, corners with two equivalent Ni(4)O5 square pyramids, corners with two equivalent Zn(1)O5 trigonal bipyramids, edges with two equivalent Ni(2)O6 octahedra, edges with two equivalent Ni(3)O6 octahedra,  a faceface with one Mg(1)O5 square pyramid, and  a faceface with one Zn(1)O5 trigonal bipyramid. In the third Ni site, Ni(3) is bonded to one O(1), one O(6), two equivalent O(2), and two equivalent O(8) atoms to form NiO6 octahedra that share corners with two equivalent Mg(1)O5 square pyramids, corners with two equivalent Ni(1)O5 square pyramids, corners with two equivalent Ni(4)O5 square pyramids, corners with two equivalent Zn(1)O5 trigonal bipyramids, edges with two equivalent Ni(2)O6 octahedra, and edges with two equivalent Ni(3)O6 octahedra. In the fourth Ni site, Ni(4) is bonded to one O(3), two equivalent O(1), and two equivalent O(7) atoms to form NiO5 square pyramids that share corners with two equivalent Ni(2)O6 octahedra, corners with two equivalent Ni(3)O6 octahedra, corners with two equivalent Zn(1)O5 trigonal bipyramids, edges with two equivalent Mg(1)O5 square pyramids, edges with two equivalent Ni(4)O5 square pyramids, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 51-63°. Zn(1) is bonded to one O(4), two equivalent O(6), and two equivalent O(7) atoms to form distorted ZnO5 trigonal bipyramids that share corners with two equivalent Ni(2)O6 octahedra, corners with two equivalent Ni(3)O6 octahedra, corners with two equivalent Mg(1)O5 square pyramids, corners with two equivalent Ni(1)O5 square pyramids, corners with two equivalent Ni(4)O5 square pyramids,  an edgeedge with one Ni(4)O5 square pyramid, edges with two equivalent Zn(1)O5 trigonal bipyramids, and  a faceface with one Ni(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-60°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Ni(3) and two equivalent Ni(4) atoms. In the second O site, O(2) is bonded in a trigonal planar geometry to one Ni(1) and two equivalent Ni(3) atoms. In the third O site, O(3) is bonded to two equivalent Mg(1), one Ni(4), and two equivalent Ni(2) atoms to form distorted OMg2Ni3 trigonal bipyramids that share corners with two equivalent O(4)ZnNi3 tetrahedra, corners with two equivalent O(6)Zn2Ni3 trigonal bipyramids,  an edgeedge with one O(6)Zn2Ni3 trigonal bipyramid, edges with two equivalent O(3)Mg2Ni3 trigonal bipyramids, edges with two equivalent O(7)MgZn2Ni2 trigonal bipyramids, and edges with two equivalent O(8)MgNi3 trigonal pyramids. In the fourth O site, O(4) is bonded to one Ni(2), two equivalent Ni(1), and one Zn(1) atom to form distorted OZnNi3 tetrahedra that share corners with two equivalent O(4)ZnNi3 tetrahedra, corners with two equivalent O(3)Mg2Ni3 trigonal bipyramids, corners with two equivalent O(7)MgZn2Ni2 trigonal bipyramids,  a cornercorner with one O(8)MgNi3 trigonal pyramid, and edges with two equivalent O(6)Zn2Ni3 trigonal bipyramids. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mg(1) and two equivalent Ni(1) atoms. In the sixth O site, O(6) is bonded to one Ni(3), two equivalent Ni(2), and two equivalent Zn(1) atoms to form distorted OZn2Ni3 trigonal bipyramids that share corners with two equivalent O(3)Mg2Ni3 trigonal bipyramids, corners with two equivalent O(7)MgZn2Ni2 trigonal bipyramids, edges with two equivalent O(4)ZnNi3 tetrahedra,  an edgeedge with one O(3)Mg2Ni3 trigonal bipyramid,  an edgeedge with one O(7)MgZn2Ni2 trigonal bipyramid, edges with two equivalent O(6)Zn2Ni3 trigonal bipyramids, and edges with two equivalent O(8)MgNi3 trigonal pyramids. In the seventh O site, O(7) is bonded to one Mg(1), two equivalent Ni(4), and two equivalent Zn(1) atoms to form OMgZn2Ni2 trigonal bipyramids that share corners with two equivalent O(4)ZnNi3 tetrahedra, corners with two equivalent O(6)Zn2Ni3 trigonal bipyramids,  a cornercorner with one O(8)MgNi3 trigonal pyramid,  an edgeedge with one O(6)Zn2Ni3 trigonal bipyramid, edges with two equivalent O(3)Mg2Ni3 trigonal bipyramids, and edges with two equivalent O(7)MgZn2Ni2 trigonal bipyramids. In the eighth O site, O(8) is bonded to one Mg(1), one Ni(2), and two equivalent Ni(3) atoms to form OMgNi3 trigonal pyramids that share  a cornercorner with one O(4)ZnNi3 tetrahedra,  a cornercorner with one O(7)MgZn2Ni2 trigonal bipyramid, corners with two equivalent O(8)MgNi3 trigonal pyramids, edges with two equivalent O(3)Mg2Ni3 trigonal bipyramids, and edges with two equivalent O(6)Zn2Ni3 trigonal bipyramids. is represented by the CIF card [CIF]
data_MgZn(NiO2)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.901
_cell_length_b   8.014
_cell_length_c   7.210
_cell_angle_alpha   69.246
_cell_angle_beta   78.357
_cell_angle_gamma   79.634
_symmetry_Int_Tables_number   1
_cell_volume   152.443
_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
  Mg  Mg0  1  0.064  0.841  0.029  1.0
  Zn  Zn1  1  0.313  0.153  0.217  1.0
  Ni  Ni2  1  0.583  0.186  0.640  1.0
  Ni  Ni3  1  0.150  0.493  0.201  1.0
  Ni  Ni4  1  0.832  0.497  0.835  1.0
  Ni  Ni5  1  0.397  0.779  0.422  1.0
  O  O6  1  0.883  0.655  0.576  1.0
  O  O7  1  0.422  0.365  0.784  1.0
  O  O8  1  0.558  0.683  0.198  1.0
  O  O9  1  0.132  0.274  0.454  1.0
  O  O10  1  0.074  0.051  0.789  1.0
  O  O11  1  0.768  0.347  0.111  1.0
  O  O12  1  0.888  0.960  0.262  1.0
  O  O13  1  0.233  0.627  0.903  1.0
[/CIF]
.