The compound described by Nd2Ce8O19 is alpha bismuth trifluoride-derived structured and crystallizes in the triclinic P1 space group. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 6-coordinate geometry to two equivalent O(10), two equivalent O(11), and two equivalent O(8) atoms. In the second Nd site, Nd(2) is bonded in a 6-coordinate geometry to two equivalent O(11), two equivalent O(12), and two equivalent O(13) atoms. There are eight inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a body-centered cubic geometry to two equivalent O(12), two equivalent O(13), two equivalent O(14), and two equivalent O(15) atoms. In the second Ce site, Ce(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(16), two equivalent O(17), and two equivalent O(2) atoms. In the third Ce site, Ce(3) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(14), two equivalent O(15), and two equivalent O(16) atoms. In the fourth Ce site, Ce(4) is bonded in a body-centered cubic geometry to two equivalent O(17), two equivalent O(18), two equivalent O(2), and two equivalent O(3) atoms. In the fifth Ce site, Ce(5) is bonded in a body-centered cubic geometry to two equivalent O(18), two equivalent O(19), two equivalent O(3), and two equivalent O(4) atoms. In the sixth Ce site, Ce(6) is bonded in a body-centered cubic geometry to two equivalent O(5), two equivalent O(6), two equivalent O(7), and two equivalent O(9) atoms. In the seventh Ce site, Ce(7) is bonded in a body-centered cubic geometry to two equivalent O(19), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. In the eighth Ce site, Ce(8) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms. There are nineteen inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ce(2) and two equivalent Ce(3) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Ce(2) and two equivalent Ce(4) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Ce(4) and two equivalent Ce(5) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Ce(5) and two equivalent Ce(7) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Ce(6) and two equivalent Ce(7) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the sixth O site, O(6) is bonded to two equivalent Ce(6) and two equivalent Ce(7) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the seventh O site, O(7) is bonded to two equivalent Ce(6) and two equivalent Ce(8) atoms to form OCe4 tetrahedra that share corners with two equivalent O(10)Ce2Nd2 tetrahedra, corners with two equivalent O(6)Ce4 tetrahedra, corners with four equivalent O(8)Ce2Nd2 tetrahedra, corners with four equivalent O(5)Ce4 tetrahedra, corners with four equivalent O(7)Ce4 tetrahedra,  an edgeedge with one O(10)Ce2Nd2 tetrahedra,  an edgeedge with one O(6)Ce4 tetrahedra, and edges with four equivalent O(9)Ce4 tetrahedra. In the eighth O site, O(8) is bonded to two equivalent Nd(1) and two equivalent Ce(8) atoms to form OCe2Nd2 tetrahedra that share corners with two equivalent O(9)Ce4 tetrahedra, corners with two equivalent O(11)Nd4 tetrahedra, corners with four equivalent O(8)Ce2Nd2 tetrahedra, corners with four equivalent O(7)Ce4 tetrahedra,  an edgeedge with one O(9)Ce4 tetrahedra,  an edgeedge with one O(11)Nd4 tetrahedra, and edges with four equivalent O(10)Ce2Nd2 tetrahedra. In the ninth O site, O(9) is bonded to two equivalent Ce(6) and two equivalent Ce(8) atoms to form OCe4 tetrahedra that share corners with two equivalent O(8)Ce2Nd2 tetrahedra, corners with two equivalent O(5)Ce4 tetrahedra, corners with four equivalent O(10)Ce2Nd2 tetrahedra, corners with four equivalent O(6)Ce4 tetrahedra, corners with four equivalent O(9)Ce4 tetrahedra,  an edgeedge with one O(8)Ce2Nd2 tetrahedra,  an edgeedge with one O(5)Ce4 tetrahedra, and edges with four equivalent O(7)Ce4 tetrahedra. In the tenth O site, O(10) is bonded to two equivalent Nd(1) and two equivalent Ce(8) atoms to form OCe2Nd2 tetrahedra that share corners with two equivalent O(7)Ce4 tetrahedra, corners with four equivalent O(10)Ce2Nd2 tetrahedra, corners with four equivalent O(9)Ce4 tetrahedra, corners with four equivalent O(11)Nd4 tetrahedra,  an edgeedge with one O(7)Ce4 tetrahedra, and edges with four equivalent O(8)Ce2Nd2 tetrahedra. In the eleventh O site, O(11) is bonded to two equivalent Nd(1) and two equivalent Nd(2) atoms to form ONd4 tetrahedra that share corners with two equivalent O(12)Ce2Nd2 tetrahedra, corners with two equivalent O(8)Ce2Nd2 tetrahedra, corners with four equivalent O(10)Ce2Nd2 tetrahedra, corners with four equivalent O(13)Ce2Nd2 tetrahedra, corners with four equivalent O(11)Nd4 tetrahedra,  an edgeedge with one O(12)Ce2Nd2 tetrahedra, and  an edgeedge with one O(8)Ce2Nd2 tetrahedra. In the twelfth O site, O(12) is bonded to two equivalent Nd(2) and two equivalent Ce(1) atoms to form OCe2Nd2 tetrahedra that share corners with two equivalent O(15)Ce4 tetrahedra, corners with two equivalent O(11)Nd4 tetrahedra, corners with four equivalent O(12)Ce2Nd2 tetrahedra, corners with four equivalent O(14)Ce4 tetrahedra,  an edgeedge with one O(15)Ce4 tetrahedra,  an edgeedge with one O(11)Nd4 tetrahedra, and edges with four equivalent O(13)Ce2Nd2 tetrahedra. In the thirteenth O site, O(13) is bonded to two equivalent Nd(2) and two equivalent Ce(1) atoms to form OCe2Nd2 tetrahedra that share corners with two equivalent O(14)Ce4 tetrahedra, corners with four equivalent O(13)Ce2Nd2 tetrahedra, corners with four equivalent O(15)Ce4 tetrahedra, corners with four equivalent O(11)Nd4 tetrahedra,  an edgeedge with one O(14)Ce4 tetrahedra, and edges with four equivalent O(12)Ce2Nd2 tetrahedra. In the fourteenth O site, O(14) is bonded to two equivalent Ce(1) and two equivalent Ce(3) atoms to form OCe4 tetrahedra that share corners with two equivalent O(13)Ce2Nd2 tetrahedra, corners with two equivalent O(16)Ce4 tetrahedra, corners with four equivalent O(12)Ce2Nd2 tetrahedra, corners with four equivalent O(1)Ce4 tetrahedra, corners with four equivalent O(14)Ce4 tetrahedra,  an edgeedge with one O(13)Ce2Nd2 tetrahedra,  an edgeedge with one O(16)Ce4 tetrahedra, and edges with four equivalent O(15)Ce4 tetrahedra. In the fifteenth O site, O(15) is bonded to two equivalent Ce(1) and two equivalent Ce(3) atoms to form OCe4 tetrahedra that share corners with two equivalent O(12)Ce2Nd2 tetrahedra, corners with two equivalent O(1)Ce4 tetrahedra, corners with four equivalent O(13)Ce2Nd2 tetrahedra, corners with four equivalent O(15)Ce4 tetrahedra, corners with four equivalent O(16)Ce4 tetrahedra,  an edgeedge with one O(12)Ce2Nd2 tetrahedra,  an edgeedge with one O(1)Ce4 tetrahedra, and edges with four equivalent O(14)Ce4 tetrahedra. In the sixteenth O site, O(16) is bonded to two equivalent Ce(2) and two equivalent Ce(3) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the seventeenth O site, O(17) is bonded to two equivalent Ce(2) and two equivalent Ce(4) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the eighteenth O site, O(18) is bonded to two equivalent Ce(4) and two equivalent Ce(5) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the nineteenth O site, O(19) is bonded to two equivalent Ce(5) and two equivalent Ce(7) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. is represented by the CIF card [CIF]
data_Ce8Nd2O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.881
_cell_length_b   38.891
_cell_length_c   37.107
_cell_angle_alpha   5.200
_cell_angle_beta   58.494
_cell_angle_gamma   60.092
_symmetry_Int_Tables_number   1
_cell_volume   415.185
_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
  Ce  Ce0  1  0.991  0.193  0.009  1.0
  Ce  Ce1  1  0.005  0.400  0.000  1.0
  Ce  Ce2  1  0.002  0.299  0.001  1.0
  Ce  Ce3  1  0.005  0.501  0.999  1.0
  Ce  Ce4  1  0.003  0.600  1.000  1.0
  Ce  Ce5  1  0.004  0.806  0.993  1.0
  Ce  Ce6  1  0.001  0.701  0.999  1.0
  Ce  Ce7  1  0.014  0.910  0.987  1.0
  Nd  Nd8  1  0.037  0.026  0.967  1.0
  Nd  Nd9  1  0.967  0.072  0.034  1.0
  O  O10  1  0.253  0.098  0.252  1.0
  O  O11  1  0.255  0.200  0.250  1.0
  O  O12  1  0.256  0.303  0.247  1.0
  O  O13  1  0.251  0.398  0.252  1.0
  O  O14  1  0.254  0.507  0.242  1.0
  O  O15  1  0.749  0.002  0.747  1.0
  O  O16  1  0.251  0.602  0.248  1.0
  O  O17  1  0.289  0.728  0.215  1.0
  O  O18  1  0.768  0.116  0.730  1.0
  O  O19  1  0.742  0.189  0.762  1.0
  O  O20  1  0.749  0.298  0.752  1.0
  O  O21  1  0.213  0.871  0.286  1.0
  O  O22  1  0.761  0.408  0.739  1.0
  O  O23  1  0.256  0.006  0.244  1.0
  O  O24  1  0.740  0.493  0.760  1.0
  O  O25  1  0.754  0.599  0.751  1.0
  O  O26  1  0.757  0.701  0.749  1.0
  O  O27  1  0.753  0.800  0.750  1.0
  O  O28  1  0.754  0.900  0.749  1.0
[/CIF]
.
The compound described by Nd2Ce8O19 is alpha bismuth trifluoride-derived structured and crystallizes in the triclinic P1 space group. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 6-coordinate geometry to two equivalent O(10), two equivalent O(11), and two equivalent O(8) atoms. In the second Nd site, Nd(2) is bonded in a 6-coordinate geometry to two equivalent O(11), two equivalent O(12), and two equivalent O(13) atoms. There are eight inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a body-centered cubic geometry to two equivalent O(12), two equivalent O(13), two equivalent O(14), and two equivalent O(15) atoms. In the second Ce site, Ce(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(16), two equivalent O(17), and two equivalent O(2) atoms. In the third Ce site, Ce(3) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(14), two equivalent O(15), and two equivalent O(16) atoms. In the fourth Ce site, Ce(4) is bonded in a body-centered cubic geometry to two equivalent O(17), two equivalent O(18), two equivalent O(2), and two equivalent O(3) atoms. In the fifth Ce site, Ce(5) is bonded in a body-centered cubic geometry to two equivalent O(18), two equivalent O(19), two equivalent O(3), and two equivalent O(4) atoms. In the sixth Ce site, Ce(6) is bonded in a body-centered cubic geometry to two equivalent O(5), two equivalent O(6), two equivalent O(7), and two equivalent O(9) atoms. In the seventh Ce site, Ce(7) is bonded in a body-centered cubic geometry to two equivalent O(19), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. In the eighth Ce site, Ce(8) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms. There are nineteen inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ce(2) and two equivalent Ce(3) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Ce(2) and two equivalent Ce(4) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Ce(4) and two equivalent Ce(5) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Ce(5) and two equivalent Ce(7) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Ce(6) and two equivalent Ce(7) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the sixth O site, O(6) is bonded to two equivalent Ce(6) and two equivalent Ce(7) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the seventh O site, O(7) is bonded to two equivalent Ce(6) and two equivalent Ce(8) atoms to form OCe4 tetrahedra that share corners with two equivalent O(10)Ce2Nd2 tetrahedra, corners with two equivalent O(6)Ce4 tetrahedra, corners with four equivalent O(8)Ce2Nd2 tetrahedra, corners with four equivalent O(5)Ce4 tetrahedra, corners with four equivalent O(7)Ce4 tetrahedra,  an edgeedge with one O(10)Ce2Nd2 tetrahedra,  an edgeedge with one O(6)Ce4 tetrahedra, and edges with four equivalent O(9)Ce4 tetrahedra. In the eighth O site, O(8) is bonded to two equivalent Nd(1) and two equivalent Ce(8) atoms to form OCe2Nd2 tetrahedra that share corners with two equivalent O(9)Ce4 tetrahedra, corners with two equivalent O(11)Nd4 tetrahedra, corners with four equivalent O(8)Ce2Nd2 tetrahedra, corners with four equivalent O(7)Ce4 tetrahedra,  an edgeedge with one O(9)Ce4 tetrahedra,  an edgeedge with one O(11)Nd4 tetrahedra, and edges with four equivalent O(10)Ce2Nd2 tetrahedra. In the ninth O site, O(9) is bonded to two equivalent Ce(6) and two equivalent Ce(8) atoms to form OCe4 tetrahedra that share corners with two equivalent O(8)Ce2Nd2 tetrahedra, corners with two equivalent O(5)Ce4 tetrahedra, corners with four equivalent O(10)Ce2Nd2 tetrahedra, corners with four equivalent O(6)Ce4 tetrahedra, corners with four equivalent O(9)Ce4 tetrahedra,  an edgeedge with one O(8)Ce2Nd2 tetrahedra,  an edgeedge with one O(5)Ce4 tetrahedra, and edges with four equivalent O(7)Ce4 tetrahedra. In the tenth O site, O(10) is bonded to two equivalent Nd(1) and two equivalent Ce(8) atoms to form OCe2Nd2 tetrahedra that share corners with two equivalent O(7)Ce4 tetrahedra, corners with four equivalent O(10)Ce2Nd2 tetrahedra, corners with four equivalent O(9)Ce4 tetrahedra, corners with four equivalent O(11)Nd4 tetrahedra,  an edgeedge with one O(7)Ce4 tetrahedra, and edges with four equivalent O(8)Ce2Nd2 tetrahedra. In the eleventh O site, O(11) is bonded to two equivalent Nd(1) and two equivalent Nd(2) atoms to form ONd4 tetrahedra that share corners with two equivalent O(12)Ce2Nd2 tetrahedra, corners with two equivalent O(8)Ce2Nd2 tetrahedra, corners with four equivalent O(10)Ce2Nd2 tetrahedra, corners with four equivalent O(13)Ce2Nd2 tetrahedra, corners with four equivalent O(11)Nd4 tetrahedra,  an edgeedge with one O(12)Ce2Nd2 tetrahedra, and  an edgeedge with one O(8)Ce2Nd2 tetrahedra. In the twelfth O site, O(12) is bonded to two equivalent Nd(2) and two equivalent Ce(1) atoms to form OCe2Nd2 tetrahedra that share corners with two equivalent O(15)Ce4 tetrahedra, corners with two equivalent O(11)Nd4 tetrahedra, corners with four equivalent O(12)Ce2Nd2 tetrahedra, corners with four equivalent O(14)Ce4 tetrahedra,  an edgeedge with one O(15)Ce4 tetrahedra,  an edgeedge with one O(11)Nd4 tetrahedra, and edges with four equivalent O(13)Ce2Nd2 tetrahedra. In the thirteenth O site, O(13) is bonded to two equivalent Nd(2) and two equivalent Ce(1) atoms to form OCe2Nd2 tetrahedra that share corners with two equivalent O(14)Ce4 tetrahedra, corners with four equivalent O(13)Ce2Nd2 tetrahedra, corners with four equivalent O(15)Ce4 tetrahedra, corners with four equivalent O(11)Nd4 tetrahedra,  an edgeedge with one O(14)Ce4 tetrahedra, and edges with four equivalent O(12)Ce2Nd2 tetrahedra. In the fourteenth O site, O(14) is bonded to two equivalent Ce(1) and two equivalent Ce(3) atoms to form OCe4 tetrahedra that share corners with two equivalent O(13)Ce2Nd2 tetrahedra, corners with two equivalent O(16)Ce4 tetrahedra, corners with four equivalent O(12)Ce2Nd2 tetrahedra, corners with four equivalent O(1)Ce4 tetrahedra, corners with four equivalent O(14)Ce4 tetrahedra,  an edgeedge with one O(13)Ce2Nd2 tetrahedra,  an edgeedge with one O(16)Ce4 tetrahedra, and edges with four equivalent O(15)Ce4 tetrahedra. In the fifteenth O site, O(15) is bonded to two equivalent Ce(1) and two equivalent Ce(3) atoms to form OCe4 tetrahedra that share corners with two equivalent O(12)Ce2Nd2 tetrahedra, corners with two equivalent O(1)Ce4 tetrahedra, corners with four equivalent O(13)Ce2Nd2 tetrahedra, corners with four equivalent O(15)Ce4 tetrahedra, corners with four equivalent O(16)Ce4 tetrahedra,  an edgeedge with one O(12)Ce2Nd2 tetrahedra,  an edgeedge with one O(1)Ce4 tetrahedra, and edges with four equivalent O(14)Ce4 tetrahedra. In the sixteenth O site, O(16) is bonded to two equivalent Ce(2) and two equivalent Ce(3) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the seventeenth O site, O(17) is bonded to two equivalent Ce(2) and two equivalent Ce(4) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the eighteenth O site, O(18) is bonded to two equivalent Ce(4) and two equivalent Ce(5) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. In the nineteenth O site, O(19) is bonded to two equivalent Ce(5) and two equivalent Ce(7) atoms to form a mixture of corner and edge-sharing OCe4 tetrahedra. is represented by the CIF card [CIF]
data_Ce8Nd2O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.881
_cell_length_b   38.891
_cell_length_c   37.107
_cell_angle_alpha   5.200
_cell_angle_beta   58.494
_cell_angle_gamma   60.092
_symmetry_Int_Tables_number   1
_cell_volume   415.185
_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
  Ce  Ce0  1  0.991  0.193  0.009  1.0
  Ce  Ce1  1  0.005  0.400  0.000  1.0
  Ce  Ce2  1  0.002  0.299  0.001  1.0
  Ce  Ce3  1  0.005  0.501  0.999  1.0
  Ce  Ce4  1  0.003  0.600  1.000  1.0
  Ce  Ce5  1  0.004  0.806  0.993  1.0
  Ce  Ce6  1  0.001  0.701  0.999  1.0
  Ce  Ce7  1  0.014  0.910  0.987  1.0
  Nd  Nd8  1  0.037  0.026  0.967  1.0
  Nd  Nd9  1  0.967  0.072  0.034  1.0
  O  O10  1  0.253  0.098  0.252  1.0
  O  O11  1  0.255  0.200  0.250  1.0
  O  O12  1  0.256  0.303  0.247  1.0
  O  O13  1  0.251  0.398  0.252  1.0
  O  O14  1  0.254  0.507  0.242  1.0
  O  O15  1  0.749  0.002  0.747  1.0
  O  O16  1  0.251  0.602  0.248  1.0
  O  O17  1  0.289  0.728  0.215  1.0
  O  O18  1  0.768  0.116  0.730  1.0
  O  O19  1  0.742  0.189  0.762  1.0
  O  O20  1  0.749  0.298  0.752  1.0
  O  O21  1  0.213  0.871  0.286  1.0
  O  O22  1  0.761  0.408  0.739  1.0
  O  O23  1  0.256  0.006  0.244  1.0
  O  O24  1  0.740  0.493  0.760  1.0
  O  O25  1  0.754  0.599  0.751  1.0
  O  O26  1  0.757  0.701  0.749  1.0
  O  O27  1  0.753  0.800  0.750  1.0
  O  O28  1  0.754  0.900  0.749  1.0
[/CIF]
.