The structure described by Tb2Ni12As7 crystallizes in the hexagonal P-6 space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 18-coordinate geometry to three equivalent Ni(2), three equivalent Ni(4), six equivalent Ni(1), and six equivalent As(2) atoms. In the second Tb site, Tb(2) is bonded in a 15-coordinate geometry to three equivalent Ni(1), six equivalent Ni(2), and six equivalent As(3) atoms. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one Tb(2), two equivalent Tb(1), two equivalent As(2), and two equivalent As(3) atoms to form distorted NiTb3As4 tetrahedra that share corners with two equivalent Ni(4)TbAs4 tetrahedra, corners with six equivalent Ni(1)Tb3As4 tetrahedra, edges with two equivalent Ni(1)Tb3As4 tetrahedra, edges with two equivalent Ni(4)TbAs4 tetrahedra, faces with two equivalent Ni(1)Tb3As4 tetrahedra, and faces with two equivalent Ni(4)TbAs4 tetrahedra. In the second Ni site, Ni(2) is bonded in a 4-coordinate geometry to one Tb(1), two equivalent Tb(2), two equivalent As(2), and two equivalent As(3) atoms. In the third Ni site, Ni(3) is bonded in a 5-coordinate geometry to one As(2), two equivalent As(1), and two equivalent As(3) atoms. In the fourth Ni site, Ni(4) is bonded to one Tb(1), one As(1), one As(3), and two equivalent As(2) atoms to form distorted NiTbAs4 tetrahedra that share corners with two equivalent Ni(1)Tb3As4 tetrahedra, corners with six equivalent Ni(4)TbAs4 tetrahedra, edges with two equivalent Ni(1)Tb3As4 tetrahedra, and faces with two equivalent Ni(1)Tb3As4 tetrahedra. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 9-coordinate geometry to three equivalent Ni(4) and six equivalent Ni(3) atoms. In the second As site, As(2) is bonded in a 9-coordinate geometry to two equivalent Tb(1), one Ni(3), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(4) atoms. In the third As site, As(3) is bonded in a 9-coordinate geometry to two equivalent Tb(2), one Ni(4), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(3) atoms. is represented by the CIF file [CIF]
data_Tb2Ni12As7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.292
_cell_length_b   9.292
_cell_length_c   3.810
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   119.994
_symmetry_Int_Tables_number   1
_cell_volume   284.926
_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
  Tb  Tb0  1  0.667  0.333  0.000  1.0
  Tb  Tb1  1  0.000  0.000  0.500  1.0
  Ni  Ni2  1  0.709  0.093  0.500  1.0
  Ni  Ni3  1  0.908  0.617  0.500  1.0
  Ni  Ni4  1  0.383  0.291  0.500  1.0
  Ni  Ni5  1  0.770  0.726  0.000  1.0
  Ni  Ni6  1  0.274  0.044  0.000  1.0
  Ni  Ni7  1  0.956  0.230  1.000  1.0
  Ni  Ni8  1  0.543  0.762  0.500  1.0
  Ni  Ni9  1  0.238  0.781  0.500  1.0
  Ni  Ni10  1  0.219  0.457  0.500  1.0
  Ni  Ni11  1  0.483  0.945  1.000  1.0
  Ni  Ni12  1  0.055  0.538  1.000  1.0
  Ni  Ni13  1  0.462  0.517  0.000  1.0
  As  As14  1  0.333  0.667  1.000  1.0
  As  As15  1  0.441  0.072  0.500  1.0
  As  As16  1  0.928  0.368  0.500  1.0
  As  As17  1  0.632  0.559  0.500  1.0
  As  As18  1  0.737  0.957  0.000  1.0
  As  As19  1  0.043  0.781  1.000  1.0
  As  As20  1  0.220  0.263  0.000  1.0
[/CIF]
.
The structure described by Tb2Ni12As7 crystallizes in the hexagonal P-6 space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 18-coordinate geometry to three equivalent Ni(2), three equivalent Ni(4), six equivalent Ni(1), and six equivalent As(2) atoms. In the second Tb site, Tb(2) is bonded in a 15-coordinate geometry to three equivalent Ni(1), six equivalent Ni(2), and six equivalent As(3) atoms. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one Tb(2), two equivalent Tb(1), two equivalent As(2), and two equivalent As(3) atoms to form distorted NiTb3As4 tetrahedra that share corners with two equivalent Ni(4)TbAs4 tetrahedra, corners with six equivalent Ni(1)Tb3As4 tetrahedra, edges with two equivalent Ni(1)Tb3As4 tetrahedra, edges with two equivalent Ni(4)TbAs4 tetrahedra, faces with two equivalent Ni(1)Tb3As4 tetrahedra, and faces with two equivalent Ni(4)TbAs4 tetrahedra. In the second Ni site, Ni(2) is bonded in a 4-coordinate geometry to one Tb(1), two equivalent Tb(2), two equivalent As(2), and two equivalent As(3) atoms. In the third Ni site, Ni(3) is bonded in a 5-coordinate geometry to one As(2), two equivalent As(1), and two equivalent As(3) atoms. In the fourth Ni site, Ni(4) is bonded to one Tb(1), one As(1), one As(3), and two equivalent As(2) atoms to form distorted NiTbAs4 tetrahedra that share corners with two equivalent Ni(1)Tb3As4 tetrahedra, corners with six equivalent Ni(4)TbAs4 tetrahedra, edges with two equivalent Ni(1)Tb3As4 tetrahedra, and faces with two equivalent Ni(1)Tb3As4 tetrahedra. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 9-coordinate geometry to three equivalent Ni(4) and six equivalent Ni(3) atoms. In the second As site, As(2) is bonded in a 9-coordinate geometry to two equivalent Tb(1), one Ni(3), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(4) atoms. In the third As site, As(3) is bonded in a 9-coordinate geometry to two equivalent Tb(2), one Ni(4), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(3) atoms. is represented by the CIF file [CIF]
data_Tb2Ni12As7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.292
_cell_length_b   9.292
_cell_length_c   3.810
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   119.994
_symmetry_Int_Tables_number   1
_cell_volume   284.926
_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
  Tb  Tb0  1  0.667  0.333  0.000  1.0
  Tb  Tb1  1  0.000  0.000  0.500  1.0
  Ni  Ni2  1  0.709  0.093  0.500  1.0
  Ni  Ni3  1  0.908  0.617  0.500  1.0
  Ni  Ni4  1  0.383  0.291  0.500  1.0
  Ni  Ni5  1  0.770  0.726  0.000  1.0
  Ni  Ni6  1  0.274  0.044  0.000  1.0
  Ni  Ni7  1  0.956  0.230  1.000  1.0
  Ni  Ni8  1  0.543  0.762  0.500  1.0
  Ni  Ni9  1  0.238  0.781  0.500  1.0
  Ni  Ni10  1  0.219  0.457  0.500  1.0
  Ni  Ni11  1  0.483  0.945  1.000  1.0
  Ni  Ni12  1  0.055  0.538  1.000  1.0
  Ni  Ni13  1  0.462  0.517  0.000  1.0
  As  As14  1  0.333  0.667  1.000  1.0
  As  As15  1  0.441  0.072  0.500  1.0
  As  As16  1  0.928  0.368  0.500  1.0
  As  As17  1  0.632  0.559  0.500  1.0
  As  As18  1  0.737  0.957  0.000  1.0
  As  As19  1  0.043  0.781  1.000  1.0
  As  As20  1  0.220  0.263  0.000  1.0
[/CIF]
.