The crystal structure described by Sr4NiCu3O8 crystallizes in the orthorhombic Amm2 space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(4), two equivalent O(1), and four equivalent O(6) atoms to form a mixture of distorted corner, edge, and face-sharing SrO7 pentagonal bipyramids. In the second Sr site, Sr(2) is bonded to one O(5), two equivalent O(2), and four equivalent O(6) atoms to form a mixture of distorted corner, edge, and face-sharing SrO7 pentagonal bipyramids. In the third Sr site, Sr(3) is bonded to one O(6), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form a mixture of distorted corner, edge, and face-sharing SrO7 pentagonal bipyramids. Ni(1) is bonded in a square co-planar geometry to one O(1), one O(4), and two equivalent O(3) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to one O(2), one O(5), and two equivalent O(3) atoms. In the second Cu site, Cu(2) is bonded in a square co-planar geometry to one O(1), one O(2), one O(3), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), one Ni(1), and two equivalent Cu(2) atoms to form OSr2Cu2Ni trigonal bipyramids that share corners with three equivalent O(4)Sr5Ni octahedra, corners with four equivalent O(6)Sr5Cu octahedra, corners with two equivalent O(1)Sr2Cu2Ni trigonal bipyramids, corners with two equivalent O(2)Sr2Cu3 trigonal bipyramids, edges with two equivalent O(3)Sr2Cu2Ni trigonal bipyramids, and faces with two equivalent O(6)Sr5Cu octahedra. The corner-sharing octahedral tilt angles range from 0-58°. In the second O site, O(2) is bonded to two equivalent Sr(2), one Cu(1), and two equivalent Cu(2) atoms to form OSr2Cu3 trigonal bipyramids that share corners with three equivalent O(5)Sr5Cu octahedra, corners with four equivalent O(6)Sr5Cu octahedra, corners with two equivalent O(1)Sr2Cu2Ni trigonal bipyramids, corners with two equivalent O(2)Sr2Cu3 trigonal bipyramids, edges with two equivalent O(3)Sr2Cu2Ni trigonal bipyramids, and faces with two equivalent O(6)Sr5Cu octahedra. The corner-sharing octahedral tilt angles range from 0-58°. In the third O site, O(3) is bonded to two equivalent Sr(3), one Ni(1), one Cu(1), and one Cu(2) atom to form OSr2Cu2Ni trigonal bipyramids that share corners with two equivalent O(5)Sr5Cu octahedra, corners with two equivalent O(4)Sr5Ni octahedra, corners with three equivalent O(6)Sr5Cu octahedra, corners with four equivalent O(3)Sr2Cu2Ni trigonal bipyramids,  an edgeedge with one O(1)Sr2Cu2Ni trigonal bipyramid,  an edgeedge with one O(2)Sr2Cu3 trigonal bipyramid,  a faceface with one O(5)Sr5Cu octahedra, and  a faceface with one O(4)Sr5Ni octahedra. The corner-sharing octahedral tilt angles range from 0-59°. In the fourth O site, O(4) is bonded to one Sr(1), four equivalent Sr(3), and one Ni(1) atom to form OSr5Ni octahedra that share corners with four equivalent O(5)Sr5Cu octahedra, corners with three equivalent O(1)Sr2Cu2Ni trigonal bipyramids, corners with four equivalent O(3)Sr2Cu2Ni trigonal bipyramids, edges with two equivalent O(5)Sr5Cu octahedra, edges with two equivalent O(4)Sr5Ni octahedra, edges with four equivalent O(6)Sr5Cu octahedra, and faces with two equivalent O(3)Sr2Cu2Ni trigonal bipyramids. The corner-sharing octahedral tilt angles are 8°. In the fifth O site, O(5) is bonded to one Sr(2), four equivalent Sr(3), and one Cu(1) atom to form distorted OSr5Cu octahedra that share corners with four equivalent O(4)Sr5Ni octahedra, corners with three equivalent O(2)Sr2Cu3 trigonal bipyramids, corners with four equivalent O(3)Sr2Cu2Ni trigonal bipyramids, edges with two equivalent O(5)Sr5Cu octahedra, edges with two equivalent O(4)Sr5Ni octahedra, edges with four equivalent O(6)Sr5Cu octahedra, and faces with two equivalent O(3)Sr2Cu2Ni trigonal bipyramids. The corner-sharing octahedral tilt angles are 8°. In the sixth O site, O(6) is bonded to one Sr(3), two equivalent Sr(1), two equivalent Sr(2), and one Cu(2) atom to form distorted OSr5Cu octahedra that share corners with four equivalent O(6)Sr5Cu octahedra, corners with two equivalent O(1)Sr2Cu2Ni trigonal bipyramids, corners with two equivalent O(2)Sr2Cu3 trigonal bipyramids, corners with three equivalent O(3)Sr2Cu2Ni trigonal bipyramids, edges with two equivalent O(5)Sr5Cu octahedra, edges with two equivalent O(4)Sr5Ni octahedra, edges with four equivalent O(6)Sr5Cu octahedra,  a faceface with one O(1)Sr2Cu2Ni trigonal bipyramid, and  a faceface with one O(2)Sr2Cu3 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 8-9°. is represented by the CIF file [CIF]
data_Sr4Cu3NiO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.370
_cell_length_b   8.370
_cell_length_c   7.876
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   154.874
_symmetry_Int_Tables_number   1
_cell_volume   234.313
_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
  Sr  Sr0  1  0.332  0.668  0.500  1.0
  Sr  Sr1  1  0.333  0.667  0.000  1.0
  Sr  Sr2  1  0.668  0.332  0.748  1.0
  Sr  Sr3  1  0.668  0.332  0.252  1.0
  Cu  Cu4  1  0.063  0.937  0.000  1.0
  Cu  Cu5  1  0.938  0.062  0.749  1.0
  Cu  Cu6  1  0.938  0.062  0.251  1.0
  Ni  Ni7  1  0.062  0.938  0.500  1.0
  O  O8  1  0.944  0.056  0.500  1.0
  O  O9  1  0.944  0.056  0.000  1.0
  O  O10  1  0.055  0.945  0.748  1.0
  O  O11  1  0.055  0.945  0.252  1.0
  O  O12  1  0.179  0.821  0.500  1.0
  O  O13  1  0.180  0.820  0.000  1.0
  O  O14  1  0.820  0.180  0.750  1.0
  O  O15  1  0.820  0.180  0.250  1.0
[/CIF]
.
The crystal structure described by Sr4NiCu3O8 crystallizes in the orthorhombic Amm2 space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(4), two equivalent O(1), and four equivalent O(6) atoms to form a mixture of distorted corner, edge, and face-sharing SrO7 pentagonal bipyramids. In the second Sr site, Sr(2) is bonded to one O(5), two equivalent O(2), and four equivalent O(6) atoms to form a mixture of distorted corner, edge, and face-sharing SrO7 pentagonal bipyramids. In the third Sr site, Sr(3) is bonded to one O(6), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form a mixture of distorted corner, edge, and face-sharing SrO7 pentagonal bipyramids. Ni(1) is bonded in a square co-planar geometry to one O(1), one O(4), and two equivalent O(3) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to one O(2), one O(5), and two equivalent O(3) atoms. In the second Cu site, Cu(2) is bonded in a square co-planar geometry to one O(1), one O(2), one O(3), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), one Ni(1), and two equivalent Cu(2) atoms to form OSr2Cu2Ni trigonal bipyramids that share corners with three equivalent O(4)Sr5Ni octahedra, corners with four equivalent O(6)Sr5Cu octahedra, corners with two equivalent O(1)Sr2Cu2Ni trigonal bipyramids, corners with two equivalent O(2)Sr2Cu3 trigonal bipyramids, edges with two equivalent O(3)Sr2Cu2Ni trigonal bipyramids, and faces with two equivalent O(6)Sr5Cu octahedra. The corner-sharing octahedral tilt angles range from 0-58°. In the second O site, O(2) is bonded to two equivalent Sr(2), one Cu(1), and two equivalent Cu(2) atoms to form OSr2Cu3 trigonal bipyramids that share corners with three equivalent O(5)Sr5Cu octahedra, corners with four equivalent O(6)Sr5Cu octahedra, corners with two equivalent O(1)Sr2Cu2Ni trigonal bipyramids, corners with two equivalent O(2)Sr2Cu3 trigonal bipyramids, edges with two equivalent O(3)Sr2Cu2Ni trigonal bipyramids, and faces with two equivalent O(6)Sr5Cu octahedra. The corner-sharing octahedral tilt angles range from 0-58°. In the third O site, O(3) is bonded to two equivalent Sr(3), one Ni(1), one Cu(1), and one Cu(2) atom to form OSr2Cu2Ni trigonal bipyramids that share corners with two equivalent O(5)Sr5Cu octahedra, corners with two equivalent O(4)Sr5Ni octahedra, corners with three equivalent O(6)Sr5Cu octahedra, corners with four equivalent O(3)Sr2Cu2Ni trigonal bipyramids,  an edgeedge with one O(1)Sr2Cu2Ni trigonal bipyramid,  an edgeedge with one O(2)Sr2Cu3 trigonal bipyramid,  a faceface with one O(5)Sr5Cu octahedra, and  a faceface with one O(4)Sr5Ni octahedra. The corner-sharing octahedral tilt angles range from 0-59°. In the fourth O site, O(4) is bonded to one Sr(1), four equivalent Sr(3), and one Ni(1) atom to form OSr5Ni octahedra that share corners with four equivalent O(5)Sr5Cu octahedra, corners with three equivalent O(1)Sr2Cu2Ni trigonal bipyramids, corners with four equivalent O(3)Sr2Cu2Ni trigonal bipyramids, edges with two equivalent O(5)Sr5Cu octahedra, edges with two equivalent O(4)Sr5Ni octahedra, edges with four equivalent O(6)Sr5Cu octahedra, and faces with two equivalent O(3)Sr2Cu2Ni trigonal bipyramids. The corner-sharing octahedral tilt angles are 8°. In the fifth O site, O(5) is bonded to one Sr(2), four equivalent Sr(3), and one Cu(1) atom to form distorted OSr5Cu octahedra that share corners with four equivalent O(4)Sr5Ni octahedra, corners with three equivalent O(2)Sr2Cu3 trigonal bipyramids, corners with four equivalent O(3)Sr2Cu2Ni trigonal bipyramids, edges with two equivalent O(5)Sr5Cu octahedra, edges with two equivalent O(4)Sr5Ni octahedra, edges with four equivalent O(6)Sr5Cu octahedra, and faces with two equivalent O(3)Sr2Cu2Ni trigonal bipyramids. The corner-sharing octahedral tilt angles are 8°. In the sixth O site, O(6) is bonded to one Sr(3), two equivalent Sr(1), two equivalent Sr(2), and one Cu(2) atom to form distorted OSr5Cu octahedra that share corners with four equivalent O(6)Sr5Cu octahedra, corners with two equivalent O(1)Sr2Cu2Ni trigonal bipyramids, corners with two equivalent O(2)Sr2Cu3 trigonal bipyramids, corners with three equivalent O(3)Sr2Cu2Ni trigonal bipyramids, edges with two equivalent O(5)Sr5Cu octahedra, edges with two equivalent O(4)Sr5Ni octahedra, edges with four equivalent O(6)Sr5Cu octahedra,  a faceface with one O(1)Sr2Cu2Ni trigonal bipyramid, and  a faceface with one O(2)Sr2Cu3 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 8-9°. is represented by the CIF file [CIF]
data_Sr4Cu3NiO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.370
_cell_length_b   8.370
_cell_length_c   7.876
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   154.874
_symmetry_Int_Tables_number   1
_cell_volume   234.313
_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
  Sr  Sr0  1  0.332  0.668  0.500  1.0
  Sr  Sr1  1  0.333  0.667  0.000  1.0
  Sr  Sr2  1  0.668  0.332  0.748  1.0
  Sr  Sr3  1  0.668  0.332  0.252  1.0
  Cu  Cu4  1  0.063  0.937  0.000  1.0
  Cu  Cu5  1  0.938  0.062  0.749  1.0
  Cu  Cu6  1  0.938  0.062  0.251  1.0
  Ni  Ni7  1  0.062  0.938  0.500  1.0
  O  O8  1  0.944  0.056  0.500  1.0
  O  O9  1  0.944  0.056  0.000  1.0
  O  O10  1  0.055  0.945  0.748  1.0
  O  O11  1  0.055  0.945  0.252  1.0
  O  O12  1  0.179  0.821  0.500  1.0
  O  O13  1  0.180  0.820  0.000  1.0
  O  O14  1  0.820  0.180  0.750  1.0
  O  O15  1  0.820  0.180  0.250  1.0
[/CIF]
.