The structure described by Sm2Zr8O19 is alpha bismuth trifluoride-derived structured and crystallizes in the tetragonal P-4m2 space group. Sm(1) is bonded in a 6-coordinate geometry to two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. There are four inequivalent Zr sites. In the first Zr site, Zr(1) is bonded in a body-centered cubic geometry to two equivalent O(4), two equivalent O(5), two equivalent O(7), and two equivalent O(8) atoms. In the second Zr site, Zr(2) is bonded in a body-centered cubic geometry to two equivalent O(3), two equivalent O(4), two equivalent O(8), and two equivalent O(9) atoms. In the third Zr site, Zr(3) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(10), two equivalent O(3), and two equivalent O(9) atoms. In the fourth Zr site, Zr(4) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(10), two equivalent O(11), and two equivalent O(2) atoms. There are eleven inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Zr(3) and two equivalent Zr(4) atoms to form a mixture of edge and corner-sharing OZr4 tetrahedra. In the second O site, O(2) is bonded to four equivalent Zr(4) atoms to form a mixture of edge and corner-sharing OZr4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Zr(2) and two equivalent Zr(3) atoms to form a mixture of edge and corner-sharing OZr4 tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Zr(1) and two equivalent Zr(2) atoms to form OZr4 tetrahedra that share corners with two equivalent O(7)Sm2Zr2 tetrahedra, corners with two equivalent O(9)Zr4 tetrahedra, corners with four equivalent O(5)Sm2Zr2 tetrahedra, corners with four equivalent O(3)Zr4 tetrahedra, corners with four equivalent O(4)Zr4 tetrahedra,  an edgeedge with one O(7)Sm2Zr2 tetrahedra,  an edgeedge with one O(9)Zr4 tetrahedra, and edges with four equivalent O(8)Zr4 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Sm(1) and two equivalent Zr(1) atoms to form OSm2Zr2 tetrahedra that share corners with two equivalent O(6)Sm4 tetrahedra, corners with two equivalent O(8)Zr4 tetrahedra, corners with four equivalent O(5)Sm2Zr2 tetrahedra, corners with four equivalent O(4)Zr4 tetrahedra,  an edgeedge with one O(6)Sm4 tetrahedra,  an edgeedge with one O(8)Zr4 tetrahedra, and edges with four equivalent O(7)Sm2Zr2 tetrahedra. In the sixth O site, O(6) is bonded to four equivalent Sm(1) atoms to form OSm4 tetrahedra that share corners with four equivalent O(5)Sm2Zr2 tetrahedra, corners with four equivalent O(6)Sm4 tetrahedra, corners with eight equivalent O(7)Sm2Zr2 tetrahedra, and edges with two equivalent O(5)Sm2Zr2 tetrahedra. In the seventh O site, O(7) is bonded to two equivalent Sm(1) and two equivalent Zr(1) atoms to form OSm2Zr2 tetrahedra that share corners with two equivalent O(4)Zr4 tetrahedra, corners with four equivalent O(7)Sm2Zr2 tetrahedra, corners with four equivalent O(6)Sm4 tetrahedra, corners with four equivalent O(8)Zr4 tetrahedra,  an edgeedge with one O(4)Zr4 tetrahedra, and edges with four equivalent O(5)Sm2Zr2 tetrahedra. In the eighth O site, O(8) is bonded to two equivalent Zr(1) and two equivalent Zr(2) atoms to form OZr4 tetrahedra that share corners with two equivalent O(5)Sm2Zr2 tetrahedra, corners with two equivalent O(3)Zr4 tetrahedra, corners with four equivalent O(7)Sm2Zr2 tetrahedra, corners with four equivalent O(8)Zr4 tetrahedra, corners with four equivalent O(9)Zr4 tetrahedra,  an edgeedge with one O(5)Sm2Zr2 tetrahedra,  an edgeedge with one O(3)Zr4 tetrahedra, and edges with four equivalent O(4)Zr4 tetrahedra. In the ninth O site, O(9) is bonded to two equivalent Zr(2) and two equivalent Zr(3) atoms to form a mixture of edge and corner-sharing OZr4 tetrahedra. In the tenth O site, O(10) is bonded to two equivalent Zr(3) and two equivalent Zr(4) atoms to form a mixture of edge and corner-sharing OZr4 tetrahedra. In the eleventh O site, O(11) is bonded to four equivalent Zr(4) atoms to form a mixture of edge and corner-sharing OZr4 tetrahedra. is represented by the CIF file [CIF]
data_Sm2Zr8O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.663
_cell_length_b   3.663
_cell_length_c   25.941
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   348.121
_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
  Sm  Sm0  1  0.000  0.500  0.942  1.0
  Sm  Sm1  1  0.500  0.000  0.058  1.0
  Zr  Zr2  1  0.000  0.500  0.155  1.0
  Zr  Zr3  1  0.500  0.000  0.254  1.0
  Zr  Zr4  1  0.000  0.500  0.352  1.0
  Zr  Zr5  1  0.500  0.000  0.451  1.0
  Zr  Zr6  1  0.000  0.500  0.549  1.0
  Zr  Zr7  1  0.500  0.000  0.648  1.0
  Zr  Zr8  1  0.000  0.500  0.746  1.0
  Zr  Zr9  1  0.500  0.000  0.845  1.0
  O  O10  1  0.000  0.000  0.399  1.0
  O  O11  1  0.500  0.500  0.500  1.0
  O  O12  1  0.000  0.000  0.601  1.0
  O  O13  1  0.500  0.500  0.693  1.0
  O  O14  1  0.000  0.000  0.801  1.0
  O  O15  1  0.500  0.500  0.888  1.0
  O  O16  1  0.500  0.500  0.000  1.0
  O  O17  1  0.500  0.500  0.112  1.0
  O  O18  1  0.000  0.000  0.199  1.0
  O  O19  1  0.000  0.000  0.101  1.0
  O  O20  1  0.500  0.500  0.210  1.0
  O  O21  1  0.500  0.500  0.307  1.0
  O  O22  1  0.000  0.000  0.299  1.0
  O  O23  1  0.500  0.500  0.404  1.0
  O  O24  1  0.000  0.000  0.500  1.0
  O  O25  1  0.500  0.500  0.596  1.0
  O  O26  1  0.000  0.000  0.701  1.0
  O  O27  1  0.500  0.500  0.790  1.0
  O  O28  1  0.000  0.000  0.899  1.0
[/CIF]
.
The structure described by Sm2Zr8O19 is alpha bismuth trifluoride-derived structured and crystallizes in the tetragonal P-4m2 space group. Sm(1) is bonded in a 6-coordinate geometry to two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. There are four inequivalent Zr sites. In the first Zr site, Zr(1) is bonded in a body-centered cubic geometry to two equivalent O(4), two equivalent O(5), two equivalent O(7), and two equivalent O(8) atoms. In the second Zr site, Zr(2) is bonded in a body-centered cubic geometry to two equivalent O(3), two equivalent O(4), two equivalent O(8), and two equivalent O(9) atoms. In the third Zr site, Zr(3) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(10), two equivalent O(3), and two equivalent O(9) atoms. In the fourth Zr site, Zr(4) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(10), two equivalent O(11), and two equivalent O(2) atoms. There are eleven inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Zr(3) and two equivalent Zr(4) atoms to form a mixture of edge and corner-sharing OZr4 tetrahedra. In the second O site, O(2) is bonded to four equivalent Zr(4) atoms to form a mixture of edge and corner-sharing OZr4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Zr(2) and two equivalent Zr(3) atoms to form a mixture of edge and corner-sharing OZr4 tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Zr(1) and two equivalent Zr(2) atoms to form OZr4 tetrahedra that share corners with two equivalent O(7)Sm2Zr2 tetrahedra, corners with two equivalent O(9)Zr4 tetrahedra, corners with four equivalent O(5)Sm2Zr2 tetrahedra, corners with four equivalent O(3)Zr4 tetrahedra, corners with four equivalent O(4)Zr4 tetrahedra,  an edgeedge with one O(7)Sm2Zr2 tetrahedra,  an edgeedge with one O(9)Zr4 tetrahedra, and edges with four equivalent O(8)Zr4 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Sm(1) and two equivalent Zr(1) atoms to form OSm2Zr2 tetrahedra that share corners with two equivalent O(6)Sm4 tetrahedra, corners with two equivalent O(8)Zr4 tetrahedra, corners with four equivalent O(5)Sm2Zr2 tetrahedra, corners with four equivalent O(4)Zr4 tetrahedra,  an edgeedge with one O(6)Sm4 tetrahedra,  an edgeedge with one O(8)Zr4 tetrahedra, and edges with four equivalent O(7)Sm2Zr2 tetrahedra. In the sixth O site, O(6) is bonded to four equivalent Sm(1) atoms to form OSm4 tetrahedra that share corners with four equivalent O(5)Sm2Zr2 tetrahedra, corners with four equivalent O(6)Sm4 tetrahedra, corners with eight equivalent O(7)Sm2Zr2 tetrahedra, and edges with two equivalent O(5)Sm2Zr2 tetrahedra. In the seventh O site, O(7) is bonded to two equivalent Sm(1) and two equivalent Zr(1) atoms to form OSm2Zr2 tetrahedra that share corners with two equivalent O(4)Zr4 tetrahedra, corners with four equivalent O(7)Sm2Zr2 tetrahedra, corners with four equivalent O(6)Sm4 tetrahedra, corners with four equivalent O(8)Zr4 tetrahedra,  an edgeedge with one O(4)Zr4 tetrahedra, and edges with four equivalent O(5)Sm2Zr2 tetrahedra. In the eighth O site, O(8) is bonded to two equivalent Zr(1) and two equivalent Zr(2) atoms to form OZr4 tetrahedra that share corners with two equivalent O(5)Sm2Zr2 tetrahedra, corners with two equivalent O(3)Zr4 tetrahedra, corners with four equivalent O(7)Sm2Zr2 tetrahedra, corners with four equivalent O(8)Zr4 tetrahedra, corners with four equivalent O(9)Zr4 tetrahedra,  an edgeedge with one O(5)Sm2Zr2 tetrahedra,  an edgeedge with one O(3)Zr4 tetrahedra, and edges with four equivalent O(4)Zr4 tetrahedra. In the ninth O site, O(9) is bonded to two equivalent Zr(2) and two equivalent Zr(3) atoms to form a mixture of edge and corner-sharing OZr4 tetrahedra. In the tenth O site, O(10) is bonded to two equivalent Zr(3) and two equivalent Zr(4) atoms to form a mixture of edge and corner-sharing OZr4 tetrahedra. In the eleventh O site, O(11) is bonded to four equivalent Zr(4) atoms to form a mixture of edge and corner-sharing OZr4 tetrahedra. is represented by the CIF file [CIF]
data_Sm2Zr8O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.663
_cell_length_b   3.663
_cell_length_c   25.941
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   348.121
_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
  Sm  Sm0  1  0.000  0.500  0.942  1.0
  Sm  Sm1  1  0.500  0.000  0.058  1.0
  Zr  Zr2  1  0.000  0.500  0.155  1.0
  Zr  Zr3  1  0.500  0.000  0.254  1.0
  Zr  Zr4  1  0.000  0.500  0.352  1.0
  Zr  Zr5  1  0.500  0.000  0.451  1.0
  Zr  Zr6  1  0.000  0.500  0.549  1.0
  Zr  Zr7  1  0.500  0.000  0.648  1.0
  Zr  Zr8  1  0.000  0.500  0.746  1.0
  Zr  Zr9  1  0.500  0.000  0.845  1.0
  O  O10  1  0.000  0.000  0.399  1.0
  O  O11  1  0.500  0.500  0.500  1.0
  O  O12  1  0.000  0.000  0.601  1.0
  O  O13  1  0.500  0.500  0.693  1.0
  O  O14  1  0.000  0.000  0.801  1.0
  O  O15  1  0.500  0.500  0.888  1.0
  O  O16  1  0.500  0.500  0.000  1.0
  O  O17  1  0.500  0.500  0.112  1.0
  O  O18  1  0.000  0.000  0.199  1.0
  O  O19  1  0.000  0.000  0.101  1.0
  O  O20  1  0.500  0.500  0.210  1.0
  O  O21  1  0.500  0.500  0.307  1.0
  O  O22  1  0.000  0.000  0.299  1.0
  O  O23  1  0.500  0.500  0.404  1.0
  O  O24  1  0.000  0.000  0.500  1.0
  O  O25  1  0.500  0.500  0.596  1.0
  O  O26  1  0.000  0.000  0.701  1.0
  O  O27  1  0.500  0.500  0.790  1.0
  O  O28  1  0.000  0.000  0.899  1.0
[/CIF]
.