The crystal structure described by Sr2Nd2CrNiO8 is (La,Ba)CuO4-derived structured and crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(2), two equivalent O(3), two equivalent O(4), and four equivalent O(5) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(2), and four equivalent O(5) atoms. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 9-coordinate geometry to one O(1), two equivalent O(3), two equivalent O(4), and four equivalent O(5) atoms. In the second Nd site, Nd(2) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(2), and four equivalent O(5) atoms. Cr(1) is bonded to one O(2), one O(3), and four equivalent O(5) atoms to form CrO6 octahedra that share corners with four equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles are 1°. Ni(1) is bonded to one O(1), one O(4), and four equivalent O(5) atoms to form NiO6 octahedra that share corners with four equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 1°. There are five inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(2), one Nd(1), two equivalent Nd(2), and one Ni(1) atom to form distorted OSr2Nd3Ni octahedra that share  a cornercorner with one O(4)Sr3Nd2Ni octahedra, corners with four equivalent O(1)Sr2Nd3Ni octahedra, corners with twelve equivalent O(5)Sr2Nd2CrNi octahedra, edges with two equivalent O(3)Sr2Nd3Cr octahedra, edges with two equivalent O(4)Sr3Nd2Ni octahedra, edges with four equivalent O(2)Sr3Nd2Cr octahedra, and faces with four equivalent O(5)Sr2Nd2CrNi octahedra. The corner-sharing octahedral tilt angles range from 0-52°. In the second O site, O(2) is bonded to one Sr(1), two equivalent Sr(2), two equivalent Nd(2), and one Cr(1) atom to form distorted OSr3Nd2Cr octahedra that share  a cornercorner with one O(3)Sr2Nd3Cr octahedra, corners with four equivalent O(2)Sr3Nd2Cr octahedra, corners with twelve equivalent O(5)Sr2Nd2CrNi octahedra, edges with two equivalent O(3)Sr2Nd3Cr octahedra, edges with two equivalent O(4)Sr3Nd2Ni octahedra, edges with four equivalent O(1)Sr2Nd3Ni octahedra, and faces with four equivalent O(5)Sr2Nd2CrNi octahedra. The corner-sharing octahedral tilt angles range from 0-56°. In the third O site, O(3) is bonded to two equivalent Sr(1), one Nd(2), two equivalent Nd(1), and one Cr(1) atom to form distorted OSr2Nd3Cr octahedra that share  a cornercorner with one O(2)Sr3Nd2Cr octahedra, corners with four equivalent O(3)Sr2Nd3Cr octahedra, corners with twelve equivalent O(5)Sr2Nd2CrNi octahedra, edges with two equivalent O(1)Sr2Nd3Ni octahedra, edges with two equivalent O(2)Sr3Nd2Cr octahedra, edges with four equivalent O(4)Sr3Nd2Ni octahedra, and faces with four equivalent O(5)Sr2Nd2CrNi octahedra. The corner-sharing octahedral tilt angles range from 0-54°. In the fourth O site, O(4) is bonded to one Sr(2), two equivalent Sr(1), two equivalent Nd(1), and one Ni(1) atom to form distorted OSr3Nd2Ni octahedra that share  a cornercorner with one O(1)Sr2Nd3Ni octahedra, corners with four equivalent O(4)Sr3Nd2Ni octahedra, corners with twelve equivalent O(5)Sr2Nd2CrNi octahedra, edges with two equivalent O(1)Sr2Nd3Ni octahedra, edges with two equivalent O(2)Sr3Nd2Cr octahedra, edges with four equivalent O(3)Sr2Nd3Cr octahedra, and faces with four equivalent O(5)Sr2Nd2CrNi octahedra. The corner-sharing octahedral tilt angles range from 0-55°. In the fifth O site, O(5) is bonded to one Sr(1), one Sr(2), one Nd(1), one Nd(2), one Cr(1), and one Ni(1) atom to form distorted OSr2Nd2CrNi octahedra that share corners with two equivalent O(5)Sr2Nd2CrNi octahedra, corners with three equivalent O(3)Sr2Nd3Cr octahedra, corners with three equivalent O(1)Sr2Nd3Ni octahedra, corners with three equivalent O(2)Sr3Nd2Cr octahedra, corners with three equivalent O(4)Sr3Nd2Ni octahedra, edges with two equivalent O(5)Sr2Nd2CrNi octahedra,  a faceface with one O(3)Sr2Nd3Cr octahedra,  a faceface with one O(1)Sr2Nd3Ni octahedra,  a faceface with one O(2)Sr3Nd2Cr octahedra,  a faceface with one O(4)Sr3Nd2Ni octahedra, and faces with four equivalent O(5)Sr2Nd2CrNi octahedra. The corner-sharing octahedral tilt angles range from 0-56°. is represented by the CIF card [CIF]
data_Sr2Nd2CrNiO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.826
_cell_length_b   6.826
_cell_length_c   5.455
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   133.069
_symmetry_Int_Tables_number   1
_cell_volume   185.692
_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  0.854  0.146  0.500  1.0
  Sr  Sr1  1  0.645  0.355  0.000  1.0
  Nd  Nd2  1  0.362  0.638  0.000  1.0
  Nd  Nd3  1  0.137  0.863  0.500  1.0
  Cr  Cr4  1  0.500  0.500  0.500  1.0
  Ni  Ni5  1  0.998  0.002  0.000  1.0
  O  O6  1  0.179  0.821  0.000  1.0
  O  O7  1  0.660  0.340  0.500  1.0
  O  O8  1  0.327  0.673  0.500  1.0
  O  O9  1  0.836  0.164  0.000  1.0
  O  O10  1  0.247  0.246  0.752  1.0
  O  O11  1  0.754  0.753  0.248  1.0
  O  O12  1  0.247  0.246  0.248  1.0
  O  O13  1  0.754  0.753  0.752  1.0
[/CIF]
.
The crystal structure described by Sr2Nd2CrNiO8 is (La,Ba)CuO4-derived structured and crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(2), two equivalent O(3), two equivalent O(4), and four equivalent O(5) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(2), and four equivalent O(5) atoms. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 9-coordinate geometry to one O(1), two equivalent O(3), two equivalent O(4), and four equivalent O(5) atoms. In the second Nd site, Nd(2) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(2), and four equivalent O(5) atoms. Cr(1) is bonded to one O(2), one O(3), and four equivalent O(5) atoms to form CrO6 octahedra that share corners with four equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles are 1°. Ni(1) is bonded to one O(1), one O(4), and four equivalent O(5) atoms to form NiO6 octahedra that share corners with four equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 1°. There are five inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(2), one Nd(1), two equivalent Nd(2), and one Ni(1) atom to form distorted OSr2Nd3Ni octahedra that share  a cornercorner with one O(4)Sr3Nd2Ni octahedra, corners with four equivalent O(1)Sr2Nd3Ni octahedra, corners with twelve equivalent O(5)Sr2Nd2CrNi octahedra, edges with two equivalent O(3)Sr2Nd3Cr octahedra, edges with two equivalent O(4)Sr3Nd2Ni octahedra, edges with four equivalent O(2)Sr3Nd2Cr octahedra, and faces with four equivalent O(5)Sr2Nd2CrNi octahedra. The corner-sharing octahedral tilt angles range from 0-52°. In the second O site, O(2) is bonded to one Sr(1), two equivalent Sr(2), two equivalent Nd(2), and one Cr(1) atom to form distorted OSr3Nd2Cr octahedra that share  a cornercorner with one O(3)Sr2Nd3Cr octahedra, corners with four equivalent O(2)Sr3Nd2Cr octahedra, corners with twelve equivalent O(5)Sr2Nd2CrNi octahedra, edges with two equivalent O(3)Sr2Nd3Cr octahedra, edges with two equivalent O(4)Sr3Nd2Ni octahedra, edges with four equivalent O(1)Sr2Nd3Ni octahedra, and faces with four equivalent O(5)Sr2Nd2CrNi octahedra. The corner-sharing octahedral tilt angles range from 0-56°. In the third O site, O(3) is bonded to two equivalent Sr(1), one Nd(2), two equivalent Nd(1), and one Cr(1) atom to form distorted OSr2Nd3Cr octahedra that share  a cornercorner with one O(2)Sr3Nd2Cr octahedra, corners with four equivalent O(3)Sr2Nd3Cr octahedra, corners with twelve equivalent O(5)Sr2Nd2CrNi octahedra, edges with two equivalent O(1)Sr2Nd3Ni octahedra, edges with two equivalent O(2)Sr3Nd2Cr octahedra, edges with four equivalent O(4)Sr3Nd2Ni octahedra, and faces with four equivalent O(5)Sr2Nd2CrNi octahedra. The corner-sharing octahedral tilt angles range from 0-54°. In the fourth O site, O(4) is bonded to one Sr(2), two equivalent Sr(1), two equivalent Nd(1), and one Ni(1) atom to form distorted OSr3Nd2Ni octahedra that share  a cornercorner with one O(1)Sr2Nd3Ni octahedra, corners with four equivalent O(4)Sr3Nd2Ni octahedra, corners with twelve equivalent O(5)Sr2Nd2CrNi octahedra, edges with two equivalent O(1)Sr2Nd3Ni octahedra, edges with two equivalent O(2)Sr3Nd2Cr octahedra, edges with four equivalent O(3)Sr2Nd3Cr octahedra, and faces with four equivalent O(5)Sr2Nd2CrNi octahedra. The corner-sharing octahedral tilt angles range from 0-55°. In the fifth O site, O(5) is bonded to one Sr(1), one Sr(2), one Nd(1), one Nd(2), one Cr(1), and one Ni(1) atom to form distorted OSr2Nd2CrNi octahedra that share corners with two equivalent O(5)Sr2Nd2CrNi octahedra, corners with three equivalent O(3)Sr2Nd3Cr octahedra, corners with three equivalent O(1)Sr2Nd3Ni octahedra, corners with three equivalent O(2)Sr3Nd2Cr octahedra, corners with three equivalent O(4)Sr3Nd2Ni octahedra, edges with two equivalent O(5)Sr2Nd2CrNi octahedra,  a faceface with one O(3)Sr2Nd3Cr octahedra,  a faceface with one O(1)Sr2Nd3Ni octahedra,  a faceface with one O(2)Sr3Nd2Cr octahedra,  a faceface with one O(4)Sr3Nd2Ni octahedra, and faces with four equivalent O(5)Sr2Nd2CrNi octahedra. The corner-sharing octahedral tilt angles range from 0-56°. is represented by the CIF card [CIF]
data_Sr2Nd2CrNiO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.826
_cell_length_b   6.826
_cell_length_c   5.455
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   133.069
_symmetry_Int_Tables_number   1
_cell_volume   185.692
_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  0.854  0.146  0.500  1.0
  Sr  Sr1  1  0.645  0.355  0.000  1.0
  Nd  Nd2  1  0.362  0.638  0.000  1.0
  Nd  Nd3  1  0.137  0.863  0.500  1.0
  Cr  Cr4  1  0.500  0.500  0.500  1.0
  Ni  Ni5  1  0.998  0.002  0.000  1.0
  O  O6  1  0.179  0.821  0.000  1.0
  O  O7  1  0.660  0.340  0.500  1.0
  O  O8  1  0.327  0.673  0.500  1.0
  O  O9  1  0.836  0.164  0.000  1.0
  O  O10  1  0.247  0.246  0.752  1.0
  O  O11  1  0.754  0.753  0.248  1.0
  O  O12  1  0.247  0.246  0.248  1.0
  O  O13  1  0.754  0.753  0.752  1.0
[/CIF]
.