The material structure described by Sr2LaF7 crystallizes in the monoclinic Cm space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one F(10), one F(12), one F(4), three equivalent F(14), and three equivalent F(2) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one F(6), three equivalent F(1), and three equivalent F(4) atoms. In the third Sr site, Sr(3) is bonded in a body-centered cubic geometry to one F(1), one F(8), three equivalent F(3), and three equivalent F(6) atoms. In the fourth Sr site, Sr(4) is bonded in a body-centered cubic geometry to one F(11), one F(3), three equivalent F(5), and three equivalent F(8) atoms. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 11-coordinate geometry to one F(13), one F(5), three equivalent F(11), three equivalent F(7), and three equivalent F(9) atoms. In the second La site, La(2) is bonded in a 10-coordinate geometry to one F(14), three equivalent F(10), three equivalent F(12), and three equivalent F(13) atoms. There are fourteen inequivalent F sites. In the first F site, F(1) is bonded to one Sr(3) and three equivalent Sr(2) atoms to form a mixture of corner and edge-sharing FSr4 tetrahedra. In the second F site, F(2) is bonded in a 3-coordinate geometry to three equivalent Sr(1) atoms. In the third F site, F(3) is bonded to one Sr(4) and three equivalent Sr(3) atoms to form FSr4 tetrahedra that share  a cornercorner with one F(11)SrLa3 tetrahedra, corners with three equivalent F(5)Sr3La tetrahedra, corners with three equivalent F(1)Sr4 tetrahedra, corners with three equivalent F(6)Sr4 tetrahedra, corners with six equivalent F(3)Sr4 tetrahedra, edges with three equivalent F(6)Sr4 tetrahedra, and edges with three equivalent F(8)Sr4 tetrahedra. In the fourth F site, F(4) is bonded to one Sr(1) and three equivalent Sr(2) atoms to form FSr4 tetrahedra that share corners with three equivalent F(14)Sr3La tetrahedra, corners with three equivalent F(1)Sr4 tetrahedra, corners with three equivalent F(6)Sr4 tetrahedra, corners with six equivalent F(4)Sr4 tetrahedra, and edges with three equivalent F(1)Sr4 tetrahedra. In the fifth F site, F(5) is bonded to three equivalent Sr(4) and one La(1) atom to form FSr3La tetrahedra that share  a cornercorner with one F(13)La4 tetrahedra, corners with three equivalent F(3)Sr4 tetrahedra, corners with three equivalent F(8)Sr4 tetrahedra, corners with six equivalent F(5)Sr3La tetrahedra, edges with three equivalent F(8)Sr4 tetrahedra, and edges with three equivalent F(11)SrLa3 tetrahedra. In the sixth F site, F(6) is bonded to one Sr(2) and three equivalent Sr(3) atoms to form a mixture of corner and edge-sharing FSr4 tetrahedra. In the seventh F site, F(7) is bonded in a trigonal planar geometry to three equivalent La(1) atoms. In the eighth F site, F(8) is bonded to one Sr(3) and three equivalent Sr(4) atoms to form FSr4 tetrahedra that share  a cornercorner with one F(1)Sr4 tetrahedra, corners with three equivalent F(5)Sr3La tetrahedra, corners with three equivalent F(6)Sr4 tetrahedra, corners with three equivalent F(11)SrLa3 tetrahedra, corners with six equivalent F(8)Sr4 tetrahedra, edges with three equivalent F(5)Sr3La tetrahedra, and edges with three equivalent F(3)Sr4 tetrahedra. In the ninth F site, F(9) is bonded in a 3-coordinate geometry to three equivalent La(1) atoms. In the tenth F site, F(10) is bonded in a distorted trigonal planar geometry to one Sr(1) and three equivalent La(2) atoms. In the eleventh F site, F(11) is bonded to one Sr(4) and three equivalent La(1) atoms to form distorted FSrLa3 tetrahedra that share  a cornercorner with one F(3)Sr4 tetrahedra, corners with three equivalent F(13)La4 tetrahedra, corners with three equivalent F(8)Sr4 tetrahedra, corners with six equivalent F(11)SrLa3 tetrahedra, and edges with three equivalent F(5)Sr3La tetrahedra. In the twelfth F site, F(12) is bonded in a 4-coordinate geometry to one Sr(1) and three equivalent La(2) atoms. In the thirteenth F site, F(13) is bonded to one La(1) and three equivalent La(2) atoms to form FLa4 tetrahedra that share  a cornercorner with one F(5)Sr3La tetrahedra, corners with three equivalent F(14)Sr3La tetrahedra, corners with three equivalent F(11)SrLa3 tetrahedra, and corners with six equivalent F(13)La4 tetrahedra. In the fourteenth F site, F(14) is bonded to three equivalent Sr(1) and one La(2) atom to form distorted FSr3La tetrahedra that share corners with three equivalent F(13)La4 tetrahedra, corners with three equivalent F(4)Sr4 tetrahedra, and corners with six equivalent F(14)Sr3La tetrahedra. is represented by the CIF card [CIF]
data_Sr2LaF7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.150
_cell_length_b   4.150
_cell_length_c   21.092
_cell_angle_alpha   88.797
_cell_angle_beta   88.797
_cell_angle_gamma   59.299
_symmetry_Int_Tables_number   1
_cell_volume   312.307
_cell_formula_units_Z   2
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
  Sr  Sr0  1  0.022  0.022  0.005  1.0
  Sr  Sr1  1  0.353  0.353  0.171  1.0
  Sr  Sr2  1  0.669  0.669  0.333  1.0
  Sr  Sr3  1  0.999  0.999  0.497  1.0
  La  La4  1  0.338  0.338  0.671  1.0
  La  La5  1  0.672  0.672  0.844  1.0
  F  F6  1  0.682  0.682  0.215  1.0
  F  F7  1  0.715  0.715  0.063  1.0
  F  F8  1  0.999  0.999  0.375  1.0
  F  F9  1  0.028  0.028  0.130  1.0
  F  F10  1  0.332  0.332  0.545  1.0
  F  F11  1  0.340  0.340  0.293  1.0
  F  F12  1  0.668  0.668  0.682  1.0
  F  F13  1  0.668  0.668  0.457  1.0
  F  F14  1  0.995  0.995  0.732  1.0
  F  F15  1  0.999  0.999  0.862  1.0
  F  F16  1  0.999  0.999  0.613  1.0
  F  F17  1  0.321  0.321  0.911  1.0
  F  F18  1  0.329  0.329  0.788  1.0
  F  F19  1  0.648  0.648  0.954  1.0
[/CIF]
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The material structure described by Sr2LaF7 crystallizes in the monoclinic Cm space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one F(10), one F(12), one F(4), three equivalent F(14), and three equivalent F(2) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one F(6), three equivalent F(1), and three equivalent F(4) atoms. In the third Sr site, Sr(3) is bonded in a body-centered cubic geometry to one F(1), one F(8), three equivalent F(3), and three equivalent F(6) atoms. In the fourth Sr site, Sr(4) is bonded in a body-centered cubic geometry to one F(11), one F(3), three equivalent F(5), and three equivalent F(8) atoms. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 11-coordinate geometry to one F(13), one F(5), three equivalent F(11), three equivalent F(7), and three equivalent F(9) atoms. In the second La site, La(2) is bonded in a 10-coordinate geometry to one F(14), three equivalent F(10), three equivalent F(12), and three equivalent F(13) atoms. There are fourteen inequivalent F sites. In the first F site, F(1) is bonded to one Sr(3) and three equivalent Sr(2) atoms to form a mixture of corner and edge-sharing FSr4 tetrahedra. In the second F site, F(2) is bonded in a 3-coordinate geometry to three equivalent Sr(1) atoms. In the third F site, F(3) is bonded to one Sr(4) and three equivalent Sr(3) atoms to form FSr4 tetrahedra that share  a cornercorner with one F(11)SrLa3 tetrahedra, corners with three equivalent F(5)Sr3La tetrahedra, corners with three equivalent F(1)Sr4 tetrahedra, corners with three equivalent F(6)Sr4 tetrahedra, corners with six equivalent F(3)Sr4 tetrahedra, edges with three equivalent F(6)Sr4 tetrahedra, and edges with three equivalent F(8)Sr4 tetrahedra. In the fourth F site, F(4) is bonded to one Sr(1) and three equivalent Sr(2) atoms to form FSr4 tetrahedra that share corners with three equivalent F(14)Sr3La tetrahedra, corners with three equivalent F(1)Sr4 tetrahedra, corners with three equivalent F(6)Sr4 tetrahedra, corners with six equivalent F(4)Sr4 tetrahedra, and edges with three equivalent F(1)Sr4 tetrahedra. In the fifth F site, F(5) is bonded to three equivalent Sr(4) and one La(1) atom to form FSr3La tetrahedra that share  a cornercorner with one F(13)La4 tetrahedra, corners with three equivalent F(3)Sr4 tetrahedra, corners with three equivalent F(8)Sr4 tetrahedra, corners with six equivalent F(5)Sr3La tetrahedra, edges with three equivalent F(8)Sr4 tetrahedra, and edges with three equivalent F(11)SrLa3 tetrahedra. In the sixth F site, F(6) is bonded to one Sr(2) and three equivalent Sr(3) atoms to form a mixture of corner and edge-sharing FSr4 tetrahedra. In the seventh F site, F(7) is bonded in a trigonal planar geometry to three equivalent La(1) atoms. In the eighth F site, F(8) is bonded to one Sr(3) and three equivalent Sr(4) atoms to form FSr4 tetrahedra that share  a cornercorner with one F(1)Sr4 tetrahedra, corners with three equivalent F(5)Sr3La tetrahedra, corners with three equivalent F(6)Sr4 tetrahedra, corners with three equivalent F(11)SrLa3 tetrahedra, corners with six equivalent F(8)Sr4 tetrahedra, edges with three equivalent F(5)Sr3La tetrahedra, and edges with three equivalent F(3)Sr4 tetrahedra. In the ninth F site, F(9) is bonded in a 3-coordinate geometry to three equivalent La(1) atoms. In the tenth F site, F(10) is bonded in a distorted trigonal planar geometry to one Sr(1) and three equivalent La(2) atoms. In the eleventh F site, F(11) is bonded to one Sr(4) and three equivalent La(1) atoms to form distorted FSrLa3 tetrahedra that share  a cornercorner with one F(3)Sr4 tetrahedra, corners with three equivalent F(13)La4 tetrahedra, corners with three equivalent F(8)Sr4 tetrahedra, corners with six equivalent F(11)SrLa3 tetrahedra, and edges with three equivalent F(5)Sr3La tetrahedra. In the twelfth F site, F(12) is bonded in a 4-coordinate geometry to one Sr(1) and three equivalent La(2) atoms. In the thirteenth F site, F(13) is bonded to one La(1) and three equivalent La(2) atoms to form FLa4 tetrahedra that share  a cornercorner with one F(5)Sr3La tetrahedra, corners with three equivalent F(14)Sr3La tetrahedra, corners with three equivalent F(11)SrLa3 tetrahedra, and corners with six equivalent F(13)La4 tetrahedra. In the fourteenth F site, F(14) is bonded to three equivalent Sr(1) and one La(2) atom to form distorted FSr3La tetrahedra that share corners with three equivalent F(13)La4 tetrahedra, corners with three equivalent F(4)Sr4 tetrahedra, and corners with six equivalent F(14)Sr3La tetrahedra. is represented by the CIF card [CIF]
data_Sr2LaF7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.150
_cell_length_b   4.150
_cell_length_c   21.092
_cell_angle_alpha   88.797
_cell_angle_beta   88.797
_cell_angle_gamma   59.299
_symmetry_Int_Tables_number   1
_cell_volume   312.307
_cell_formula_units_Z   2
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
  Sr  Sr0  1  0.022  0.022  0.005  1.0
  Sr  Sr1  1  0.353  0.353  0.171  1.0
  Sr  Sr2  1  0.669  0.669  0.333  1.0
  Sr  Sr3  1  0.999  0.999  0.497  1.0
  La  La4  1  0.338  0.338  0.671  1.0
  La  La5  1  0.672  0.672  0.844  1.0
  F  F6  1  0.682  0.682  0.215  1.0
  F  F7  1  0.715  0.715  0.063  1.0
  F  F8  1  0.999  0.999  0.375  1.0
  F  F9  1  0.028  0.028  0.130  1.0
  F  F10  1  0.332  0.332  0.545  1.0
  F  F11  1  0.340  0.340  0.293  1.0
  F  F12  1  0.668  0.668  0.682  1.0
  F  F13  1  0.668  0.668  0.457  1.0
  F  F14  1  0.995  0.995  0.732  1.0
  F  F15  1  0.999  0.999  0.862  1.0
  F  F16  1  0.999  0.999  0.613  1.0
  F  F17  1  0.321  0.321  0.911  1.0
  F  F18  1  0.329  0.329  0.788  1.0
  F  F19  1  0.648  0.648  0.954  1.0
[/CIF]
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