The material described by Th8Nd2O19 is alpha bismuth trifluoride-derived structured and crystallizes in the tetragonal P-4m2 space group. There are five inequivalent Th sites. In the first Th site, Th(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(6), two equivalent O(7), and two equivalent O(8) atoms. In the second Th site, Th(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms. In the third Th site, Th(3) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. In the fourth Th site, Th(4) is bonded in a body-centered cubic geometry to two equivalent O(10); two equivalent O(3); and four equivalent O(4,11) atoms. In the fifth Th site, Th(4) is bonded in a body-centered cubic geometry to two equivalent O(10); two equivalent O(3); and four equivalent O(4,11) atoms. Nd(1) is bonded in a 6-coordinate geometry to two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms. There are ten inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Th(1) and two equivalent Th(2) atoms to form OTh4 tetrahedra that share corners with two equivalent O(8)Nd2Th2 tetrahedra, corners with two equivalent O(5)Th4 tetrahedra, corners with four equivalent O(7)Nd2Th2 tetrahedra, corners with four equivalent O(1)Th4 tetrahedra, corners with four equivalent O(2)Th4 tetrahedra,  an edgeedge with one O(8)Nd2Th2 tetrahedra,  an edgeedge with one O(5)Th4 tetrahedra, and edges with four equivalent O(6)Th4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Th(2) and two equivalent Th(3) atoms to form a mixture of edge and corner-sharing OTh4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Th(3) and two equivalent Th(4) atoms to form a mixture of edge and corner-sharing OTh4 tetrahedra. In the fourth O site, O(4,11) is bonded to four Th(4,4) atoms to form a mixture of edge and corner-sharing OTh4 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Th(2) and two equivalent Th(3) atoms to form a mixture of edge and corner-sharing OTh4 tetrahedra. In the sixth O site, O(6) is bonded to two equivalent Th(1) and two equivalent Th(2) atoms to form OTh4 tetrahedra that share corners with two equivalent O(7)Nd2Th2 tetrahedra, corners with two equivalent O(2)Th4 tetrahedra, corners with four equivalent O(8)Nd2Th2 tetrahedra, corners with four equivalent O(5)Th4 tetrahedra, corners with four equivalent O(6)Th4 tetrahedra,  an edgeedge with one O(7)Nd2Th2 tetrahedra,  an edgeedge with one O(2)Th4 tetrahedra, and edges with four equivalent O(1)Th4 tetrahedra. In the seventh O site, O(7) is bonded to two equivalent Th(1) and two equivalent Nd(1) atoms to form ONd2Th2 tetrahedra that share corners with two equivalent O(9)Nd4 tetrahedra, corners with two equivalent O(6)Th4 tetrahedra, corners with four equivalent O(7)Nd2Th2 tetrahedra, corners with four equivalent O(1)Th4 tetrahedra,  an edgeedge with one O(9)Nd4 tetrahedra,  an edgeedge with one O(6)Th4 tetrahedra, and edges with four equivalent O(8)Nd2Th2 tetrahedra. In the eighth O site, O(8) is bonded to two equivalent Th(1) and two equivalent Nd(1) atoms to form ONd2Th2 tetrahedra that share corners with two equivalent O(1)Th4 tetrahedra, corners with four equivalent O(8)Nd2Th2 tetrahedra, corners with four equivalent O(9)Nd4 tetrahedra, corners with four equivalent O(6)Th4 tetrahedra,  an edgeedge with one O(1)Th4 tetrahedra, and edges with four equivalent O(7)Nd2Th2 tetrahedra. In the ninth O site, O(9) is bonded to four equivalent Nd(1) atoms to form ONd4 tetrahedra that share corners with four equivalent O(7)Nd2Th2 tetrahedra, corners with four equivalent O(9)Nd4 tetrahedra, corners with eight equivalent O(8)Nd2Th2 tetrahedra, and edges with two equivalent O(7)Nd2Th2 tetrahedra. In the tenth O site, O(10) is bonded to two equivalent Th(3) and two equivalent Th(4) atoms to form a mixture of edge and corner-sharing OTh4 tetrahedra. is represented by the CIF card [CIF]
data_Nd2Th8O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.975
_cell_length_b   3.975
_cell_length_c   28.167
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   445.139
_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
  Nd  Nd0  1  0.500  0.000  0.944  1.0
  Nd  Nd1  1  0.000  0.500  0.056  1.0
  Th  Th2  1  0.500  0.000  0.150  1.0
  Th  Th3  1  0.000  0.500  0.250  1.0
  Th  Th4  1  0.500  0.000  0.350  1.0
  Th  Th5  1  0.000  0.500  0.450  1.0
  Th  Th6  1  0.500  0.000  0.550  1.0
  Th  Th7  1  0.000  0.500  0.650  1.0
  Th  Th8  1  0.500  0.000  0.750  1.0
  Th  Th9  1  0.000  0.500  0.850  1.0
  O  O10  1  0.500  0.500  0.198  1.0
  O  O11  1  0.000  0.000  0.300  1.0
  O  O12  1  0.500  0.500  0.400  1.0
  O  O13  1  0.000  0.000  0.500  1.0
  O  O14  1  0.500  0.500  0.600  1.0
  O  O15  1  0.000  0.000  0.700  1.0
  O  O16  1  0.500  0.500  0.700  1.0
  O  O17  1  0.500  0.500  0.802  1.0
  O  O18  1  0.000  0.000  0.797  1.0
  O  O19  1  0.000  0.000  0.895  1.0
  O  O20  1  0.500  0.500  0.904  1.0
  O  O21  1  0.000  0.000  0.000  1.0
  O  O22  1  0.000  0.000  0.105  1.0
  O  O23  1  0.500  0.500  0.096  1.0
  O  O24  1  0.000  0.000  0.203  1.0
  O  O25  1  0.500  0.500  0.300  1.0
  O  O26  1  0.000  0.000  0.400  1.0
  O  O27  1  0.500  0.500  0.500  1.0
  O  O28  1  0.000  0.000  0.600  1.0
[/CIF]
.
The material described by Th8Nd2O19 is alpha bismuth trifluoride-derived structured and crystallizes in the tetragonal P-4m2 space group. There are five inequivalent Th sites. In the first Th site, Th(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(6), two equivalent O(7), and two equivalent O(8) atoms. In the second Th site, Th(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms. In the third Th site, Th(3) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. In the fourth Th site, Th(4) is bonded in a body-centered cubic geometry to two equivalent O(10); two equivalent O(3); and four equivalent O(4,11) atoms. In the fifth Th site, Th(4) is bonded in a body-centered cubic geometry to two equivalent O(10); two equivalent O(3); and four equivalent O(4,11) atoms. Nd(1) is bonded in a 6-coordinate geometry to two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms. There are ten inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Th(1) and two equivalent Th(2) atoms to form OTh4 tetrahedra that share corners with two equivalent O(8)Nd2Th2 tetrahedra, corners with two equivalent O(5)Th4 tetrahedra, corners with four equivalent O(7)Nd2Th2 tetrahedra, corners with four equivalent O(1)Th4 tetrahedra, corners with four equivalent O(2)Th4 tetrahedra,  an edgeedge with one O(8)Nd2Th2 tetrahedra,  an edgeedge with one O(5)Th4 tetrahedra, and edges with four equivalent O(6)Th4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Th(2) and two equivalent Th(3) atoms to form a mixture of edge and corner-sharing OTh4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Th(3) and two equivalent Th(4) atoms to form a mixture of edge and corner-sharing OTh4 tetrahedra. In the fourth O site, O(4,11) is bonded to four Th(4,4) atoms to form a mixture of edge and corner-sharing OTh4 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Th(2) and two equivalent Th(3) atoms to form a mixture of edge and corner-sharing OTh4 tetrahedra. In the sixth O site, O(6) is bonded to two equivalent Th(1) and two equivalent Th(2) atoms to form OTh4 tetrahedra that share corners with two equivalent O(7)Nd2Th2 tetrahedra, corners with two equivalent O(2)Th4 tetrahedra, corners with four equivalent O(8)Nd2Th2 tetrahedra, corners with four equivalent O(5)Th4 tetrahedra, corners with four equivalent O(6)Th4 tetrahedra,  an edgeedge with one O(7)Nd2Th2 tetrahedra,  an edgeedge with one O(2)Th4 tetrahedra, and edges with four equivalent O(1)Th4 tetrahedra. In the seventh O site, O(7) is bonded to two equivalent Th(1) and two equivalent Nd(1) atoms to form ONd2Th2 tetrahedra that share corners with two equivalent O(9)Nd4 tetrahedra, corners with two equivalent O(6)Th4 tetrahedra, corners with four equivalent O(7)Nd2Th2 tetrahedra, corners with four equivalent O(1)Th4 tetrahedra,  an edgeedge with one O(9)Nd4 tetrahedra,  an edgeedge with one O(6)Th4 tetrahedra, and edges with four equivalent O(8)Nd2Th2 tetrahedra. In the eighth O site, O(8) is bonded to two equivalent Th(1) and two equivalent Nd(1) atoms to form ONd2Th2 tetrahedra that share corners with two equivalent O(1)Th4 tetrahedra, corners with four equivalent O(8)Nd2Th2 tetrahedra, corners with four equivalent O(9)Nd4 tetrahedra, corners with four equivalent O(6)Th4 tetrahedra,  an edgeedge with one O(1)Th4 tetrahedra, and edges with four equivalent O(7)Nd2Th2 tetrahedra. In the ninth O site, O(9) is bonded to four equivalent Nd(1) atoms to form ONd4 tetrahedra that share corners with four equivalent O(7)Nd2Th2 tetrahedra, corners with four equivalent O(9)Nd4 tetrahedra, corners with eight equivalent O(8)Nd2Th2 tetrahedra, and edges with two equivalent O(7)Nd2Th2 tetrahedra. In the tenth O site, O(10) is bonded to two equivalent Th(3) and two equivalent Th(4) atoms to form a mixture of edge and corner-sharing OTh4 tetrahedra. is represented by the CIF card [CIF]
data_Nd2Th8O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.975
_cell_length_b   3.975
_cell_length_c   28.167
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   445.139
_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
  Nd  Nd0  1  0.500  0.000  0.944  1.0
  Nd  Nd1  1  0.000  0.500  0.056  1.0
  Th  Th2  1  0.500  0.000  0.150  1.0
  Th  Th3  1  0.000  0.500  0.250  1.0
  Th  Th4  1  0.500  0.000  0.350  1.0
  Th  Th5  1  0.000  0.500  0.450  1.0
  Th  Th6  1  0.500  0.000  0.550  1.0
  Th  Th7  1  0.000  0.500  0.650  1.0
  Th  Th8  1  0.500  0.000  0.750  1.0
  Th  Th9  1  0.000  0.500  0.850  1.0
  O  O10  1  0.500  0.500  0.198  1.0
  O  O11  1  0.000  0.000  0.300  1.0
  O  O12  1  0.500  0.500  0.400  1.0
  O  O13  1  0.000  0.000  0.500  1.0
  O  O14  1  0.500  0.500  0.600  1.0
  O  O15  1  0.000  0.000  0.700  1.0
  O  O16  1  0.500  0.500  0.700  1.0
  O  O17  1  0.500  0.500  0.802  1.0
  O  O18  1  0.000  0.000  0.797  1.0
  O  O19  1  0.000  0.000  0.895  1.0
  O  O20  1  0.500  0.500  0.904  1.0
  O  O21  1  0.000  0.000  0.000  1.0
  O  O22  1  0.000  0.000  0.105  1.0
  O  O23  1  0.500  0.500  0.096  1.0
  O  O24  1  0.000  0.000  0.203  1.0
  O  O25  1  0.500  0.500  0.300  1.0
  O  O26  1  0.000  0.000  0.400  1.0
  O  O27  1  0.500  0.500  0.500  1.0
  O  O28  1  0.000  0.000  0.600  1.0
[/CIF]
.