The material structure described by Sm2Zr8O19 is alpha bismuth trifluoride-derived structured and crystallizes in the orthorhombic Pmm2 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 6-coordinate geometry to two equivalent O(19), two equivalent O(6), and two equivalent O(7) atoms. In the second Sm site, Sm(2) is bonded to two equivalent O(10), two equivalent O(7), and two equivalent O(8) atoms to form a mixture of distorted corner and edge-sharing SmO6 octahedra. The corner-sharing octahedral tilt angles are 59°. There are eight inequivalent Zr sites. In the first Zr site, Zr(1) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(11), two equivalent O(8), and two equivalent O(9) atoms. In the second Zr site, Zr(2) is bonded in a body-centered cubic geometry to two equivalent O(11), two equivalent O(12), two equivalent O(13), 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(12), two equivalent O(13), and two equivalent O(14) atoms. In the fourth Zr site, Zr(4) 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(2) atoms. In the fifth Zr site, Zr(5) is bonded in a body-centered cubic geometry to two equivalent O(15), two equivalent O(16), two equivalent O(2), and two equivalent O(3) atoms. In the sixth Zr site, Zr(6) is bonded in a body-centered cubic geometry to two equivalent O(16), two equivalent O(17), two equivalent O(3), and two equivalent O(4) atoms. In the seventh Zr site, Zr(7) is bonded in a body-centered cubic geometry to two equivalent O(17), two equivalent O(18), two equivalent O(4), and two equivalent O(5) atoms. In the eighth Zr site, Zr(8) is bonded in a body-centered cubic geometry to two equivalent O(18), two equivalent O(19), two equivalent O(5), and two equivalent O(6) atoms. There are nineteen 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 corner and edge-sharing OZr4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Zr(4) and two equivalent Zr(5) atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Zr(5) and two equivalent Zr(6) atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Zr(6) and two equivalent Zr(7) atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Zr(7) and two equivalent Zr(8) atoms to form OZr4 tetrahedra that share corners with two equivalent O(19)Sm2Zr2 tetrahedra, corners with two equivalent O(17)Zr4 tetrahedra, corners with four equivalent O(6)Sm2Zr2 tetrahedra, corners with four equivalent O(4)Zr4 tetrahedra, corners with four equivalent O(5)Zr4 tetrahedra,  an edgeedge with one O(19)Sm2Zr2 tetrahedra,  an edgeedge with one O(17)Zr4 tetrahedra, and edges with four equivalent O(18)Zr4 tetrahedra. In the sixth O site, O(6) is bonded to two equivalent Sm(1) and two equivalent Zr(8) atoms to form OSm2Zr2 tetrahedra that share corners with two equivalent O(7)Sm4 tetrahedra, corners with two equivalent O(18)Zr4 tetrahedra, corners with four equivalent O(6)Sm2Zr2 tetrahedra, corners with four equivalent O(5)Zr4 tetrahedra,  an edgeedge with one O(7)Sm4 tetrahedra,  an edgeedge with one O(18)Zr4 tetrahedra, and edges with four equivalent O(19)Sm2Zr2 tetrahedra. In the seventh O site, O(7) is bonded to two equivalent Sm(1) and two equivalent Sm(2) atoms to form OSm4 tetrahedra that share corners with two equivalent O(6)Sm2Zr2 tetrahedra, corners with two equivalent O(8)Sm2Zr2 tetrahedra, corners with four equivalent O(10)Sm2Zr2 tetrahedra, corners with four equivalent O(19)Sm2Zr2 tetrahedra, corners with four equivalent O(7)Sm4 tetrahedra,  an edgeedge with one O(6)Sm2Zr2 tetrahedra, and  an edgeedge with one O(8)Sm2Zr2 tetrahedra. In the eighth O site, O(8) is bonded to two equivalent Sm(2) and two equivalent Zr(1) atoms to form OSm2Zr2 tetrahedra that share corners with two equivalent O(7)Sm4 tetrahedra, corners with two equivalent O(11)Zr4 tetrahedra, corners with four equivalent O(8)Sm2Zr2 tetrahedra, corners with four equivalent O(9)Zr4 tetrahedra,  an edgeedge with one O(7)Sm4 tetrahedra,  an edgeedge with one O(11)Zr4 tetrahedra, and edges with four equivalent O(10)Sm2Zr2 tetrahedra. In the ninth O site, O(9) is bonded to two equivalent Zr(1) and two equivalent Zr(2) atoms to form OZr4 tetrahedra that share corners with two equivalent O(10)Sm2Zr2 tetrahedra, corners with two equivalent O(13)Zr4 tetrahedra, corners with four equivalent O(8)Sm2Zr2 tetrahedra, corners with four equivalent O(12)Zr4 tetrahedra, corners with four equivalent O(9)Zr4 tetrahedra,  an edgeedge with one O(10)Sm2Zr2 tetrahedra,  an edgeedge with one O(13)Zr4 tetrahedra, and edges with four equivalent O(11)Zr4 tetrahedra. In the tenth O site, O(10) is bonded to two equivalent Sm(2) and two equivalent Zr(1) atoms to form OSm2Zr2 tetrahedra that share corners with two equivalent O(9)Zr4 tetrahedra, corners with four equivalent O(10)Sm2Zr2 tetrahedra, corners with four equivalent O(7)Sm4 tetrahedra, corners with four equivalent O(11)Zr4 tetrahedra,  an edgeedge with one O(9)Zr4 tetrahedra, and edges with four equivalent O(8)Sm2Zr2 tetrahedra. In the eleventh O site, O(11) is bonded to two equivalent Zr(1) and two equivalent Zr(2) atoms to form OZr4 tetrahedra that share corners with two equivalent O(8)Sm2Zr2 tetrahedra, corners with two equivalent O(12)Zr4 tetrahedra, corners with four equivalent O(10)Sm2Zr2 tetrahedra, corners with four equivalent O(11)Zr4 tetrahedra, corners with four equivalent O(13)Zr4 tetrahedra,  an edgeedge with one O(8)Sm2Zr2 tetrahedra,  an edgeedge with one O(12)Zr4 tetrahedra, and edges with four equivalent O(9)Zr4 tetrahedra. In the twelfth O site, O(12) is bonded to two equivalent Zr(2) and two equivalent Zr(3) atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the thirteenth O site, O(13) is bonded to two equivalent Zr(2) and two equivalent Zr(3) atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the fourteenth O site, O(14) is bonded to two equivalent Zr(3) and two equivalent Zr(4) atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the fifteenth O site, O(15) is bonded to two equivalent Zr(4) and two equivalent Zr(5) atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the sixteenth O site, O(16) is bonded to two equivalent Zr(5) and two equivalent Zr(6) atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the seventeenth O site, O(17) is bonded to two equivalent Zr(6) and two equivalent Zr(7) atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the eighteenth O site, O(18) is bonded to two equivalent Zr(7) and two equivalent Zr(8) atoms to form OZr4 tetrahedra that share corners with two equivalent O(6)Sm2Zr2 tetrahedra, corners with two equivalent O(4)Zr4 tetrahedra, corners with four equivalent O(19)Sm2Zr2 tetrahedra, corners with four equivalent O(17)Zr4 tetrahedra, corners with four equivalent O(18)Zr4 tetrahedra,  an edgeedge with one O(6)Sm2Zr2 tetrahedra,  an edgeedge with one O(4)Zr4 tetrahedra, and edges with four equivalent O(5)Zr4 tetrahedra. In the nineteenth O site, O(19) is bonded to two equivalent Sm(1) and two equivalent Zr(8) atoms to form OSm2Zr2 tetrahedra that share corners with two equivalent O(5)Zr4 tetrahedra, corners with four equivalent O(19)Sm2Zr2 tetrahedra, corners with four equivalent O(7)Sm4 tetrahedra, corners with four equivalent O(18)Zr4 tetrahedra,  an edgeedge with one O(5)Zr4 tetrahedra, and edges with four equivalent O(6)Sm2Zr2 tetrahedra. is represented by the CIF file [CIF]
data_Sm2Zr8O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.579
_cell_length_b   3.704
_cell_length_c   26.198
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   347.233
_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  0.500  0.000  0.792  1.0
  Sm  Sm1  1  0.000  0.500  0.910  1.0
  Zr  Zr2  1  0.500  0.000  0.009  1.0
  Zr  Zr3  1  0.000  0.500  0.108  1.0
  Zr  Zr4  1  0.500  0.000  0.206  1.0
  Zr  Zr5  1  0.000  0.500  0.303  1.0
  Zr  Zr6  1  0.500  0.000  0.401  1.0
  Zr  Zr7  1  0.000  0.500  0.498  1.0
  Zr  Zr8  1  0.500  0.000  0.596  1.0
  Zr  Zr9  1  0.000  0.500  0.694  1.0
  O  O10  1  0.000  0.000  0.250  1.0
  O  O11  1  0.500  0.500  0.352  1.0
  O  O12  1  0.000  0.000  0.448  1.0
  O  O13  1  0.500  0.500  0.545  1.0
  O  O14  1  0.000  0.000  0.646  1.0
  O  O15  1  0.500  0.500  0.738  1.0
  O  O16  1  0.500  0.500  0.843  1.0
  O  O17  1  0.500  0.500  0.966  1.0
  O  O18  1  0.000  0.000  0.051  1.0
  O  O19  1  0.000  0.000  0.950  1.0
  O  O20  1  0.500  0.500  0.061  1.0
  O  O21  1  0.500  0.500  0.160  1.0
  O  O22  1  0.000  0.000  0.150  1.0
  O  O23  1  0.500  0.500  0.255  1.0
  O  O24  1  0.000  0.000  0.348  1.0
  O  O25  1  0.500  0.500  0.447  1.0
  O  O26  1  0.000  0.000  0.545  1.0
  O  O27  1  0.500  0.500  0.640  1.0
  O  O28  1  0.000  0.000  0.742  1.0
[/CIF]
.
The material structure described by Sm2Zr8O19 is alpha bismuth trifluoride-derived structured and crystallizes in the orthorhombic Pmm2 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 6-coordinate geometry to two equivalent O(19), two equivalent O(6), and two equivalent O(7) atoms. In the second Sm site, Sm(2) is bonded to two equivalent O(10), two equivalent O(7), and two equivalent O(8) atoms to form a mixture of distorted corner and edge-sharing SmO6 octahedra. The corner-sharing octahedral tilt angles are 59°. There are eight inequivalent Zr sites. In the first Zr site, Zr(1) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(11), two equivalent O(8), and two equivalent O(9) atoms. In the second Zr site, Zr(2) is bonded in a body-centered cubic geometry to two equivalent O(11), two equivalent O(12), two equivalent O(13), 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(12), two equivalent O(13), and two equivalent O(14) atoms. In the fourth Zr site, Zr(4) 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(2) atoms. In the fifth Zr site, Zr(5) is bonded in a body-centered cubic geometry to two equivalent O(15), two equivalent O(16), two equivalent O(2), and two equivalent O(3) atoms. In the sixth Zr site, Zr(6) is bonded in a body-centered cubic geometry to two equivalent O(16), two equivalent O(17), two equivalent O(3), and two equivalent O(4) atoms. In the seventh Zr site, Zr(7) is bonded in a body-centered cubic geometry to two equivalent O(17), two equivalent O(18), two equivalent O(4), and two equivalent O(5) atoms. In the eighth Zr site, Zr(8) is bonded in a body-centered cubic geometry to two equivalent O(18), two equivalent O(19), two equivalent O(5), and two equivalent O(6) atoms. There are nineteen 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 corner and edge-sharing OZr4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Zr(4) and two equivalent Zr(5) atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Zr(5) and two equivalent Zr(6) atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Zr(6) and two equivalent Zr(7) atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Zr(7) and two equivalent Zr(8) atoms to form OZr4 tetrahedra that share corners with two equivalent O(19)Sm2Zr2 tetrahedra, corners with two equivalent O(17)Zr4 tetrahedra, corners with four equivalent O(6)Sm2Zr2 tetrahedra, corners with four equivalent O(4)Zr4 tetrahedra, corners with four equivalent O(5)Zr4 tetrahedra,  an edgeedge with one O(19)Sm2Zr2 tetrahedra,  an edgeedge with one O(17)Zr4 tetrahedra, and edges with four equivalent O(18)Zr4 tetrahedra. In the sixth O site, O(6) is bonded to two equivalent Sm(1) and two equivalent Zr(8) atoms to form OSm2Zr2 tetrahedra that share corners with two equivalent O(7)Sm4 tetrahedra, corners with two equivalent O(18)Zr4 tetrahedra, corners with four equivalent O(6)Sm2Zr2 tetrahedra, corners with four equivalent O(5)Zr4 tetrahedra,  an edgeedge with one O(7)Sm4 tetrahedra,  an edgeedge with one O(18)Zr4 tetrahedra, and edges with four equivalent O(19)Sm2Zr2 tetrahedra. In the seventh O site, O(7) is bonded to two equivalent Sm(1) and two equivalent Sm(2) atoms to form OSm4 tetrahedra that share corners with two equivalent O(6)Sm2Zr2 tetrahedra, corners with two equivalent O(8)Sm2Zr2 tetrahedra, corners with four equivalent O(10)Sm2Zr2 tetrahedra, corners with four equivalent O(19)Sm2Zr2 tetrahedra, corners with four equivalent O(7)Sm4 tetrahedra,  an edgeedge with one O(6)Sm2Zr2 tetrahedra, and  an edgeedge with one O(8)Sm2Zr2 tetrahedra. In the eighth O site, O(8) is bonded to two equivalent Sm(2) and two equivalent Zr(1) atoms to form OSm2Zr2 tetrahedra that share corners with two equivalent O(7)Sm4 tetrahedra, corners with two equivalent O(11)Zr4 tetrahedra, corners with four equivalent O(8)Sm2Zr2 tetrahedra, corners with four equivalent O(9)Zr4 tetrahedra,  an edgeedge with one O(7)Sm4 tetrahedra,  an edgeedge with one O(11)Zr4 tetrahedra, and edges with four equivalent O(10)Sm2Zr2 tetrahedra. In the ninth O site, O(9) is bonded to two equivalent Zr(1) and two equivalent Zr(2) atoms to form OZr4 tetrahedra that share corners with two equivalent O(10)Sm2Zr2 tetrahedra, corners with two equivalent O(13)Zr4 tetrahedra, corners with four equivalent O(8)Sm2Zr2 tetrahedra, corners with four equivalent O(12)Zr4 tetrahedra, corners with four equivalent O(9)Zr4 tetrahedra,  an edgeedge with one O(10)Sm2Zr2 tetrahedra,  an edgeedge with one O(13)Zr4 tetrahedra, and edges with four equivalent O(11)Zr4 tetrahedra. In the tenth O site, O(10) is bonded to two equivalent Sm(2) and two equivalent Zr(1) atoms to form OSm2Zr2 tetrahedra that share corners with two equivalent O(9)Zr4 tetrahedra, corners with four equivalent O(10)Sm2Zr2 tetrahedra, corners with four equivalent O(7)Sm4 tetrahedra, corners with four equivalent O(11)Zr4 tetrahedra,  an edgeedge with one O(9)Zr4 tetrahedra, and edges with four equivalent O(8)Sm2Zr2 tetrahedra. In the eleventh O site, O(11) is bonded to two equivalent Zr(1) and two equivalent Zr(2) atoms to form OZr4 tetrahedra that share corners with two equivalent O(8)Sm2Zr2 tetrahedra, corners with two equivalent O(12)Zr4 tetrahedra, corners with four equivalent O(10)Sm2Zr2 tetrahedra, corners with four equivalent O(11)Zr4 tetrahedra, corners with four equivalent O(13)Zr4 tetrahedra,  an edgeedge with one O(8)Sm2Zr2 tetrahedra,  an edgeedge with one O(12)Zr4 tetrahedra, and edges with four equivalent O(9)Zr4 tetrahedra. In the twelfth O site, O(12) is bonded to two equivalent Zr(2) and two equivalent Zr(3) atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the thirteenth O site, O(13) is bonded to two equivalent Zr(2) and two equivalent Zr(3) atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the fourteenth O site, O(14) is bonded to two equivalent Zr(3) and two equivalent Zr(4) atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the fifteenth O site, O(15) is bonded to two equivalent Zr(4) and two equivalent Zr(5) atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the sixteenth O site, O(16) is bonded to two equivalent Zr(5) and two equivalent Zr(6) atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the seventeenth O site, O(17) is bonded to two equivalent Zr(6) and two equivalent Zr(7) atoms to form a mixture of corner and edge-sharing OZr4 tetrahedra. In the eighteenth O site, O(18) is bonded to two equivalent Zr(7) and two equivalent Zr(8) atoms to form OZr4 tetrahedra that share corners with two equivalent O(6)Sm2Zr2 tetrahedra, corners with two equivalent O(4)Zr4 tetrahedra, corners with four equivalent O(19)Sm2Zr2 tetrahedra, corners with four equivalent O(17)Zr4 tetrahedra, corners with four equivalent O(18)Zr4 tetrahedra,  an edgeedge with one O(6)Sm2Zr2 tetrahedra,  an edgeedge with one O(4)Zr4 tetrahedra, and edges with four equivalent O(5)Zr4 tetrahedra. In the nineteenth O site, O(19) is bonded to two equivalent Sm(1) and two equivalent Zr(8) atoms to form OSm2Zr2 tetrahedra that share corners with two equivalent O(5)Zr4 tetrahedra, corners with four equivalent O(19)Sm2Zr2 tetrahedra, corners with four equivalent O(7)Sm4 tetrahedra, corners with four equivalent O(18)Zr4 tetrahedra,  an edgeedge with one O(5)Zr4 tetrahedra, and edges with four equivalent O(6)Sm2Zr2 tetrahedra. is represented by the CIF file [CIF]
data_Sm2Zr8O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.579
_cell_length_b   3.704
_cell_length_c   26.198
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   347.233
_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  0.500  0.000  0.792  1.0
  Sm  Sm1  1  0.000  0.500  0.910  1.0
  Zr  Zr2  1  0.500  0.000  0.009  1.0
  Zr  Zr3  1  0.000  0.500  0.108  1.0
  Zr  Zr4  1  0.500  0.000  0.206  1.0
  Zr  Zr5  1  0.000  0.500  0.303  1.0
  Zr  Zr6  1  0.500  0.000  0.401  1.0
  Zr  Zr7  1  0.000  0.500  0.498  1.0
  Zr  Zr8  1  0.500  0.000  0.596  1.0
  Zr  Zr9  1  0.000  0.500  0.694  1.0
  O  O10  1  0.000  0.000  0.250  1.0
  O  O11  1  0.500  0.500  0.352  1.0
  O  O12  1  0.000  0.000  0.448  1.0
  O  O13  1  0.500  0.500  0.545  1.0
  O  O14  1  0.000  0.000  0.646  1.0
  O  O15  1  0.500  0.500  0.738  1.0
  O  O16  1  0.500  0.500  0.843  1.0
  O  O17  1  0.500  0.500  0.966  1.0
  O  O18  1  0.000  0.000  0.051  1.0
  O  O19  1  0.000  0.000  0.950  1.0
  O  O20  1  0.500  0.500  0.061  1.0
  O  O21  1  0.500  0.500  0.160  1.0
  O  O22  1  0.000  0.000  0.150  1.0
  O  O23  1  0.500  0.500  0.255  1.0
  O  O24  1  0.000  0.000  0.348  1.0
  O  O25  1  0.500  0.500  0.447  1.0
  O  O26  1  0.000  0.000  0.545  1.0
  O  O27  1  0.500  0.500  0.640  1.0
  O  O28  1  0.000  0.000  0.742  1.0
[/CIF]
.