The material described by Sr4Zn3Si5 is hexagonal omega structure-derived structured and crystallizes in the hexagonal P-6m2 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to three equivalent Zn(2), three equivalent Si(1), three equivalent Si(2), and three equivalent Si(4) atoms to form SrZn3Si9 cuboctahedra that share edges with six equivalent Sr(1)Zn3Si9 cuboctahedra, edges with six equivalent Sr(2)Zn6Si6 cuboctahedra,  a faceface with one Sr(2)Zn6Si6 cuboctahedra, and faces with seven equivalent Sr(1)Zn3Si9 cuboctahedra. In the second Sr site, Sr(2) is bonded to three equivalent Zn(1), three equivalent Zn(2), three equivalent Si(1), and three equivalent Si(3) atoms to form SrZn6Si6 cuboctahedra that share edges with six equivalent Sr(1)Zn3Si9 cuboctahedra, edges with six equivalent Sr(2)Zn6Si6 cuboctahedra,  a faceface with one Sr(1)Zn3Si9 cuboctahedra, and faces with seven equivalent Sr(2)Zn6Si6 cuboctahedra. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a distorted trigonal planar geometry to six equivalent Sr(2) and three equivalent Si(3) atoms. In the second Zn site, Zn(2) is bonded in a distorted trigonal planar geometry to three equivalent Sr(1), three equivalent Sr(2), and three equivalent Si(1) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted trigonal planar geometry to three equivalent Sr(1), three equivalent Sr(2), and three equivalent Zn(2) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Sr(1) and three equivalent Si(4) atoms. In the third Si site, Si(3) is bonded in a distorted trigonal planar geometry to six equivalent Sr(2) and three equivalent Zn(1) atoms. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to six equivalent Sr(1) and three equivalent Si(2) atoms. is represented by the CIF file [CIF]
data_Sr4Zn3Si5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.264
_cell_length_b   4.264
_cell_length_c   18.295
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   288.014
_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
  Sr  Sr0  1  0.333  0.667  0.126  1.0
  Sr  Sr1  1  0.333  0.667  0.625  1.0
  Sr  Sr2  1  0.333  0.667  0.375  1.0
  Sr  Sr3  1  0.333  0.667  0.874  1.0
  Zn  Zn4  1  0.667  0.333  0.500  1.0
  Zn  Zn5  1  0.000  0.000  0.249  1.0
  Zn  Zn6  1  0.000  0.000  0.751  1.0
  Si  Si7  1  0.667  0.333  0.251  1.0
  Si  Si8  1  0.667  0.333  0.749  1.0
  Si  Si9  1  0.000  0.000  0.000  1.0
  Si  Si10  1  0.000  0.000  0.500  1.0
  Si  Si11  1  0.667  0.333  0.000  1.0
[/CIF]
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The material described by Sr4Zn3Si5 is hexagonal omega structure-derived structured and crystallizes in the hexagonal P-6m2 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to three equivalent Zn(2), three equivalent Si(1), three equivalent Si(2), and three equivalent Si(4) atoms to form SrZn3Si9 cuboctahedra that share edges with six equivalent Sr(1)Zn3Si9 cuboctahedra, edges with six equivalent Sr(2)Zn6Si6 cuboctahedra,  a faceface with one Sr(2)Zn6Si6 cuboctahedra, and faces with seven equivalent Sr(1)Zn3Si9 cuboctahedra. In the second Sr site, Sr(2) is bonded to three equivalent Zn(1), three equivalent Zn(2), three equivalent Si(1), and three equivalent Si(3) atoms to form SrZn6Si6 cuboctahedra that share edges with six equivalent Sr(1)Zn3Si9 cuboctahedra, edges with six equivalent Sr(2)Zn6Si6 cuboctahedra,  a faceface with one Sr(1)Zn3Si9 cuboctahedra, and faces with seven equivalent Sr(2)Zn6Si6 cuboctahedra. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a distorted trigonal planar geometry to six equivalent Sr(2) and three equivalent Si(3) atoms. In the second Zn site, Zn(2) is bonded in a distorted trigonal planar geometry to three equivalent Sr(1), three equivalent Sr(2), and three equivalent Si(1) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted trigonal planar geometry to three equivalent Sr(1), three equivalent Sr(2), and three equivalent Zn(2) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Sr(1) and three equivalent Si(4) atoms. In the third Si site, Si(3) is bonded in a distorted trigonal planar geometry to six equivalent Sr(2) and three equivalent Zn(1) atoms. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to six equivalent Sr(1) and three equivalent Si(2) atoms. is represented by the CIF file [CIF]
data_Sr4Zn3Si5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.264
_cell_length_b   4.264
_cell_length_c   18.295
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   288.014
_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
  Sr  Sr0  1  0.333  0.667  0.126  1.0
  Sr  Sr1  1  0.333  0.667  0.625  1.0
  Sr  Sr2  1  0.333  0.667  0.375  1.0
  Sr  Sr3  1  0.333  0.667  0.874  1.0
  Zn  Zn4  1  0.667  0.333  0.500  1.0
  Zn  Zn5  1  0.000  0.000  0.249  1.0
  Zn  Zn6  1  0.000  0.000  0.751  1.0
  Si  Si7  1  0.667  0.333  0.251  1.0
  Si  Si8  1  0.667  0.333  0.749  1.0
  Si  Si9  1  0.000  0.000  0.000  1.0
  Si  Si10  1  0.000  0.000  0.500  1.0
  Si  Si11  1  0.667  0.333  0.000  1.0
[/CIF]
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