The crystal structure described by Sr2MgZn2Sn2(PO4)4 crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 6-coordinate geometry to one O(2), one O(6), one O(7), one O(8), and two equivalent O(1) atoms. Mg(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(6) atoms to form MgO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra and edges with two equivalent P(1)O4 tetrahedra. Zn(1) is bonded in a 3-coordinate geometry to one Sn(1), one O(2), one O(4), and one O(5) atom. Sn(1) is bonded in a 4-coordinate geometry to one Zn(1), one O(3), one O(5), and one O(7) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(7) atom to form PO4 tetrahedra that share  an edgeedge with one Mg(1)O6 octahedra. In the second P site, P(2) is bonded to one O(4), one O(5), one O(6), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Mg(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Sr(1), one Zn(1), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one Sn(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Zn(1), one Sn(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Sr(1), one Mg(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Sr(1), one Sn(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Sr(1) and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2MgZn2Sn2(PO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.366
_cell_length_b   7.723
_cell_length_c   9.489
_cell_angle_alpha   104.408
_cell_angle_beta   109.750
_cell_angle_gamma   106.133
_symmetry_Int_Tables_number   1
_cell_volume   390.314
_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  0.243  0.637  0.939  1.0
  Sr  Sr1  1  0.757  0.363  0.061  1.0
  Mg  Mg2  1  0.000  0.000  0.000  1.0
  Zn  Zn3  1  0.162  0.262  0.571  1.0
  Zn  Zn4  1  0.838  0.738  0.429  1.0
  Sn  Sn5  1  0.524  0.821  0.525  1.0
  Sn  Sn6  1  0.476  0.179  0.475  1.0
  P  P7  1  0.310  0.393  0.197  1.0
  P  P8  1  0.690  0.607  0.803  1.0
  P  P9  1  0.758  0.018  0.260  1.0
  P  P10  1  0.242  0.982  0.740  1.0
  O  O11  1  0.883  0.682  0.983  1.0
  O  O12  1  0.565  0.512  0.213  1.0
  O  O13  1  0.686  0.798  0.775  1.0
  O  O14  1  0.064  0.079  0.677  1.0
  O  O15  1  0.435  0.488  0.787  1.0
  O  O16  1  0.175  0.787  0.592  1.0
  O  O17  1  0.825  0.213  0.408  1.0
  O  O18  1  0.204  0.929  0.879  1.0
  O  O19  1  0.314  0.202  0.225  1.0
  O  O20  1  0.796  0.071  0.121  1.0
  O  O21  1  0.117  0.318  0.017  1.0
  O  O22  1  0.225  0.517  0.304  1.0
  O  O23  1  0.775  0.483  0.696  1.0
  O  O24  1  0.493  0.887  0.208  1.0
  O  O25  1  0.936  0.921  0.323  1.0
  O  O26  1  0.507  0.113  0.792  1.0
[/CIF]
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The crystal structure described by Sr2MgZn2Sn2(PO4)4 crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 6-coordinate geometry to one O(2), one O(6), one O(7), one O(8), and two equivalent O(1) atoms. Mg(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(6) atoms to form MgO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra and edges with two equivalent P(1)O4 tetrahedra. Zn(1) is bonded in a 3-coordinate geometry to one Sn(1), one O(2), one O(4), and one O(5) atom. Sn(1) is bonded in a 4-coordinate geometry to one Zn(1), one O(3), one O(5), and one O(7) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(7) atom to form PO4 tetrahedra that share  an edgeedge with one Mg(1)O6 octahedra. In the second P site, P(2) is bonded to one O(4), one O(5), one O(6), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Mg(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Sr(1), one Zn(1), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one Sn(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Zn(1), one Sn(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Sr(1), one Mg(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Sr(1), one Sn(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Sr(1) and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2MgZn2Sn2(PO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.366
_cell_length_b   7.723
_cell_length_c   9.489
_cell_angle_alpha   104.408
_cell_angle_beta   109.750
_cell_angle_gamma   106.133
_symmetry_Int_Tables_number   1
_cell_volume   390.314
_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  0.243  0.637  0.939  1.0
  Sr  Sr1  1  0.757  0.363  0.061  1.0
  Mg  Mg2  1  0.000  0.000  0.000  1.0
  Zn  Zn3  1  0.162  0.262  0.571  1.0
  Zn  Zn4  1  0.838  0.738  0.429  1.0
  Sn  Sn5  1  0.524  0.821  0.525  1.0
  Sn  Sn6  1  0.476  0.179  0.475  1.0
  P  P7  1  0.310  0.393  0.197  1.0
  P  P8  1  0.690  0.607  0.803  1.0
  P  P9  1  0.758  0.018  0.260  1.0
  P  P10  1  0.242  0.982  0.740  1.0
  O  O11  1  0.883  0.682  0.983  1.0
  O  O12  1  0.565  0.512  0.213  1.0
  O  O13  1  0.686  0.798  0.775  1.0
  O  O14  1  0.064  0.079  0.677  1.0
  O  O15  1  0.435  0.488  0.787  1.0
  O  O16  1  0.175  0.787  0.592  1.0
  O  O17  1  0.825  0.213  0.408  1.0
  O  O18  1  0.204  0.929  0.879  1.0
  O  O19  1  0.314  0.202  0.225  1.0
  O  O20  1  0.796  0.071  0.121  1.0
  O  O21  1  0.117  0.318  0.017  1.0
  O  O22  1  0.225  0.517  0.304  1.0
  O  O23  1  0.775  0.483  0.696  1.0
  O  O24  1  0.493  0.887  0.208  1.0
  O  O25  1  0.936  0.921  0.323  1.0
  O  O26  1  0.507  0.113  0.792  1.0
[/CIF]
.