The material structure described by ZnSn2(PO4)2 crystallizes in the triclinic P1 space group. There are four inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(15), one O(2), one O(20), and one O(23) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra, and corners with two equivalent P(8)O4 tetrahedra. In the second Zn site, Zn(2) is bonded to one O(10), one O(14), one O(17), and one O(3) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. In the third Zn site, Zn(3) is bonded to one O(21), one O(25), one O(26), and one O(27) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra, and corners with two equivalent P(7)O4 tetrahedra. In the fourth Zn site, Zn(4) is bonded to one O(1), one O(12), one O(13), and one O(8) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. There are eight inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a distorted T-shaped geometry to one O(13), one O(5), and one O(7) atom. In the second Sn site, Sn(2) is bonded in a 3-coordinate geometry to one O(25), one O(28), and one O(4) atom. In the third Sn site, Sn(3) is bonded in a 3-coordinate geometry to one O(18), one O(2), and one O(29) atom. In the fourth Sn site, Sn(4) is bonded in a 4-coordinate geometry to one O(1), one O(15), one O(29), and one O(5) atom. In the fifth Sn site, Sn(5) is bonded in a 3-coordinate geometry to one O(10), one O(22), and one O(9) atom. In the sixth Sn site, Sn(6) is bonded in a distorted rectangular see-saw-like geometry to one O(11), one O(24), one O(31), and one O(32) atom. In the seventh Sn site, Sn(7) is bonded in a distorted rectangular see-saw-like geometry to one O(16), one O(19), one O(30), and one O(6) atom. In the eighth Sn site, Sn(8) is bonded in a 4-coordinate geometry to one O(22), one O(26), one O(28), and one O(3) atom. There are eight inequivalent P sites. In the first P site, P(1) is bonded to one O(15), one O(16), one O(17), and one O(29) atom to form PO4 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra and  a cornercorner with one Zn(2)O4 tetrahedra. In the second P site, P(2) is bonded to one O(10), one O(14), one O(4), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Zn(2)O4 tetrahedra. In the third P site, P(3) is bonded to one O(1), one O(11), one O(27), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Zn(3)O4 tetrahedra and  a cornercorner with one Zn(4)O4 tetrahedra. In the fourth P site, P(4) is bonded to one O(13), one O(18), one O(24), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Zn(4)O4 tetrahedra. In the fifth P site, P(5) is bonded to one O(12), one O(26), one O(28), and one O(32) atom to form PO4 tetrahedra that share  a cornercorner with one Zn(3)O4 tetrahedra and  a cornercorner with one Zn(4)O4 tetrahedra. In the sixth P site, P(6) is bonded to one O(19), one O(20), one O(22), and one O(3) atom to form PO4 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra and  a cornercorner with one Zn(2)O4 tetrahedra. In the seventh P site, P(7) is bonded to one O(21), one O(25), one O(31), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Zn(3)O4 tetrahedra. In the eighth P site, P(8) is bonded to one O(2), one O(23), one O(30), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra. There are thirty-two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Zn(4), one Sn(4), and one P(3) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Zn(1), one Sn(3), and one P(8) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Zn(2), one Sn(8), and one P(6) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Sn(2) and one P(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Sn(1), one Sn(4), and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Sn(7) and one P(2) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(8) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Zn(4) and one P(4) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Sn(5) and one P(7) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Zn(2), one Sn(5), and one P(2) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one Sn(6) and one P(3) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Zn(4) and one P(5) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Zn(4), one Sn(1), and one P(4) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 150 degrees geometry to one Zn(2) and one P(2) atom. In the fifteenth O site, O(15) is bonded in a 2-coordinate geometry to one Zn(1), one Sn(4), and one P(1) atom. In the sixteenth O site, O(16) is bonded in a distorted single-bond geometry to one Sn(7) and one P(1) atom. In the seventeenth O site, O(17) is bonded in a bent 150 degrees geometry to one Zn(2) and one P(1) atom. In the eighteenth O site, O(18) is bonded in a bent 120 degrees geometry to one Sn(3) and one P(4) atom. In the nineteenth O site, O(19) is bonded in a distorted single-bond geometry to one Sn(7) and one P(6) atom. In the twentieth O site, O(20) is bonded in a bent 150 degrees geometry to one Zn(1) and one P(6) atom. In the twenty-first O site, O(21) is bonded in a distorted bent 150 degrees geometry to one Zn(3) and one P(7) atom. In the twenty-second O site, O(22) is bonded in a 3-coordinate geometry to one Sn(5), one Sn(8), and one P(6) atom. In the twenty-third O site, O(23) is bonded in a distorted bent 150 degrees geometry to one Zn(1) and one P(8) atom. In the twenty-fourth O site, O(24) is bonded in a distorted bent 120 degrees geometry to one Sn(6) and one P(4) atom. In the twenty-fifth O site, O(25) is bonded in a distorted trigonal planar geometry to one Zn(3), one Sn(2), and one P(7) atom. In the twenty-sixth O site, O(26) is bonded in a 2-coordinate geometry to one Zn(3), one Sn(8), and one P(5) atom. In the twenty-seventh O site, O(27) is bonded in a bent 150 degrees geometry to one Zn(3) and one P(3) atom. In the twenty-eighth O site, O(28) is bonded in a 3-coordinate geometry to one Sn(2), one Sn(8), and one P(5) atom. In the twenty-ninth O site, O(29) is bonded in a 3-coordinate geometry to one Sn(3), one Sn(4), and one P(1) atom. In the thirtieth O site, O(30) is bonded in a distorted bent 120 degrees geometry to one Sn(7) and one P(8) atom. In the thirty-first O site, O(31) is bonded in a distorted bent 120 degrees geometry to one Sn(6) and one P(7) atom. In the thirty-second O site, O(32) is bonded in a distorted single-bond geometry to one Sn(6) and one P(5) atom. is represented by the CIF card [CIF]
data_ZnSn2(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.233
_cell_length_b   9.627
_cell_length_c   16.518
_cell_angle_alpha   87.074
_cell_angle_beta   80.857
_cell_angle_gamma   74.237
_symmetry_Int_Tables_number   1
_cell_volume   790.596
_cell_formula_units_Z   4
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
  Zn  Zn0  1  0.381  0.848  0.840  1.0
  Zn  Zn1  1  0.072  0.649  0.661  1.0
  Zn  Zn2  1  0.927  0.352  0.339  1.0
  Zn  Zn3  1  0.618  0.149  0.161  1.0
  Sn  Sn4  1  0.188  0.198  0.990  1.0
  Sn  Sn5  1  0.378  0.299  0.511  1.0
  Sn  Sn6  1  0.813  0.798  0.010  1.0
  Sn  Sn7  1  0.500  0.499  0.003  1.0
  Sn  Sn8  1  0.624  0.699  0.490  1.0
  Sn  Sn9  1  0.656  0.752  0.251  1.0
  Sn  Sn10  1  0.341  0.251  0.750  1.0
  Sn  Sn11  1  0.999  0.998  0.501  1.0
  P  P12  1  0.089  0.585  0.862  1.0
  P  P13  1  0.693  0.443  0.623  1.0
  P  P14  1  0.909  0.414  0.138  1.0
  P  P15  1  0.239  0.944  0.124  1.0
  P  P16  1  0.463  0.088  0.362  1.0
  P  P17  1  0.541  0.913  0.638  1.0
  P  P18  1  0.307  0.557  0.376  1.0
  P  P19  1  0.758  0.055  0.876  1.0
  O  O20  1  0.731  0.321  0.110  1.0
  O  O21  1  0.645  0.918  0.897  1.0
  O  O22  1  0.841  0.821  0.609  1.0
  O  O23  1  0.739  0.332  0.553  1.0
  O  O24  1  0.167  0.386  0.069  1.0
  O  O25  1  0.606  0.383  0.708  1.0
  O  O26  1  0.623  0.168  0.946  1.0
  O  O27  1  0.935  0.988  0.122  1.0
  O  O28  1  0.263  0.670  0.445  1.0
  O  O29  1  0.460  0.581  0.604  1.0
  O  O30  1  0.755  0.575  0.131  1.0
  O  O31  1  0.582  0.140  0.279  1.0
  O  O32  1  0.350  0.083  0.105  1.0
  O  O33  1  0.953  0.490  0.620  1.0
  O  O34  1  0.265  0.677  0.891  1.0
  O  O35  1  0.240  0.423  0.867  1.0
  O  O36  1  0.004  0.639  0.779  1.0
  O  O37  1  0.376  0.834  0.054  1.0
  O  O38  1  0.539  0.074  0.632  1.0
  O  O39  1  0.429  0.858  0.721  1.0
  O  O40  1  0.044  0.514  0.378  1.0
  O  O41  1  0.377  0.884  0.570  1.0
  O  O42  1  0.063  0.010  0.878  1.0
  O  O43  1  0.303  0.883  0.208  1.0
  O  O44  1  0.537  0.419  0.396  1.0
  O  O45  1  0.166  0.183  0.390  1.0
  O  O46  1  0.999  0.363  0.220  1.0
  O  O47  1  0.628  0.115  0.430  1.0
  O  O48  1  0.828  0.613  0.930  1.0
  O  O49  1  0.693  0.115  0.792  1.0
  O  O50  1  0.399  0.616  0.291  1.0
  O  O51  1  0.462  0.927  0.368  1.0
[/CIF]
.
The material structure described by ZnSn2(PO4)2 crystallizes in the triclinic P1 space group. There are four inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(15), one O(2), one O(20), and one O(23) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra, and corners with two equivalent P(8)O4 tetrahedra. In the second Zn site, Zn(2) is bonded to one O(10), one O(14), one O(17), and one O(3) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. In the third Zn site, Zn(3) is bonded to one O(21), one O(25), one O(26), and one O(27) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra, and corners with two equivalent P(7)O4 tetrahedra. In the fourth Zn site, Zn(4) is bonded to one O(1), one O(12), one O(13), and one O(8) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. There are eight inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a distorted T-shaped geometry to one O(13), one O(5), and one O(7) atom. In the second Sn site, Sn(2) is bonded in a 3-coordinate geometry to one O(25), one O(28), and one O(4) atom. In the third Sn site, Sn(3) is bonded in a 3-coordinate geometry to one O(18), one O(2), and one O(29) atom. In the fourth Sn site, Sn(4) is bonded in a 4-coordinate geometry to one O(1), one O(15), one O(29), and one O(5) atom. In the fifth Sn site, Sn(5) is bonded in a 3-coordinate geometry to one O(10), one O(22), and one O(9) atom. In the sixth Sn site, Sn(6) is bonded in a distorted rectangular see-saw-like geometry to one O(11), one O(24), one O(31), and one O(32) atom. In the seventh Sn site, Sn(7) is bonded in a distorted rectangular see-saw-like geometry to one O(16), one O(19), one O(30), and one O(6) atom. In the eighth Sn site, Sn(8) is bonded in a 4-coordinate geometry to one O(22), one O(26), one O(28), and one O(3) atom. There are eight inequivalent P sites. In the first P site, P(1) is bonded to one O(15), one O(16), one O(17), and one O(29) atom to form PO4 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra and  a cornercorner with one Zn(2)O4 tetrahedra. In the second P site, P(2) is bonded to one O(10), one O(14), one O(4), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Zn(2)O4 tetrahedra. In the third P site, P(3) is bonded to one O(1), one O(11), one O(27), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Zn(3)O4 tetrahedra and  a cornercorner with one Zn(4)O4 tetrahedra. In the fourth P site, P(4) is bonded to one O(13), one O(18), one O(24), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Zn(4)O4 tetrahedra. In the fifth P site, P(5) is bonded to one O(12), one O(26), one O(28), and one O(32) atom to form PO4 tetrahedra that share  a cornercorner with one Zn(3)O4 tetrahedra and  a cornercorner with one Zn(4)O4 tetrahedra. In the sixth P site, P(6) is bonded to one O(19), one O(20), one O(22), and one O(3) atom to form PO4 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra and  a cornercorner with one Zn(2)O4 tetrahedra. In the seventh P site, P(7) is bonded to one O(21), one O(25), one O(31), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Zn(3)O4 tetrahedra. In the eighth P site, P(8) is bonded to one O(2), one O(23), one O(30), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra. There are thirty-two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Zn(4), one Sn(4), and one P(3) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Zn(1), one Sn(3), and one P(8) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Zn(2), one Sn(8), and one P(6) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Sn(2) and one P(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Sn(1), one Sn(4), and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Sn(7) and one P(2) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(8) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Zn(4) and one P(4) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Sn(5) and one P(7) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Zn(2), one Sn(5), and one P(2) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one Sn(6) and one P(3) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Zn(4) and one P(5) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Zn(4), one Sn(1), and one P(4) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 150 degrees geometry to one Zn(2) and one P(2) atom. In the fifteenth O site, O(15) is bonded in a 2-coordinate geometry to one Zn(1), one Sn(4), and one P(1) atom. In the sixteenth O site, O(16) is bonded in a distorted single-bond geometry to one Sn(7) and one P(1) atom. In the seventeenth O site, O(17) is bonded in a bent 150 degrees geometry to one Zn(2) and one P(1) atom. In the eighteenth O site, O(18) is bonded in a bent 120 degrees geometry to one Sn(3) and one P(4) atom. In the nineteenth O site, O(19) is bonded in a distorted single-bond geometry to one Sn(7) and one P(6) atom. In the twentieth O site, O(20) is bonded in a bent 150 degrees geometry to one Zn(1) and one P(6) atom. In the twenty-first O site, O(21) is bonded in a distorted bent 150 degrees geometry to one Zn(3) and one P(7) atom. In the twenty-second O site, O(22) is bonded in a 3-coordinate geometry to one Sn(5), one Sn(8), and one P(6) atom. In the twenty-third O site, O(23) is bonded in a distorted bent 150 degrees geometry to one Zn(1) and one P(8) atom. In the twenty-fourth O site, O(24) is bonded in a distorted bent 120 degrees geometry to one Sn(6) and one P(4) atom. In the twenty-fifth O site, O(25) is bonded in a distorted trigonal planar geometry to one Zn(3), one Sn(2), and one P(7) atom. In the twenty-sixth O site, O(26) is bonded in a 2-coordinate geometry to one Zn(3), one Sn(8), and one P(5) atom. In the twenty-seventh O site, O(27) is bonded in a bent 150 degrees geometry to one Zn(3) and one P(3) atom. In the twenty-eighth O site, O(28) is bonded in a 3-coordinate geometry to one Sn(2), one Sn(8), and one P(5) atom. In the twenty-ninth O site, O(29) is bonded in a 3-coordinate geometry to one Sn(3), one Sn(4), and one P(1) atom. In the thirtieth O site, O(30) is bonded in a distorted bent 120 degrees geometry to one Sn(7) and one P(8) atom. In the thirty-first O site, O(31) is bonded in a distorted bent 120 degrees geometry to one Sn(6) and one P(7) atom. In the thirty-second O site, O(32) is bonded in a distorted single-bond geometry to one Sn(6) and one P(5) atom. is represented by the CIF card [CIF]
data_ZnSn2(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.233
_cell_length_b   9.627
_cell_length_c   16.518
_cell_angle_alpha   87.074
_cell_angle_beta   80.857
_cell_angle_gamma   74.237
_symmetry_Int_Tables_number   1
_cell_volume   790.596
_cell_formula_units_Z   4
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
  Zn  Zn0  1  0.381  0.848  0.840  1.0
  Zn  Zn1  1  0.072  0.649  0.661  1.0
  Zn  Zn2  1  0.927  0.352  0.339  1.0
  Zn  Zn3  1  0.618  0.149  0.161  1.0
  Sn  Sn4  1  0.188  0.198  0.990  1.0
  Sn  Sn5  1  0.378  0.299  0.511  1.0
  Sn  Sn6  1  0.813  0.798  0.010  1.0
  Sn  Sn7  1  0.500  0.499  0.003  1.0
  Sn  Sn8  1  0.624  0.699  0.490  1.0
  Sn  Sn9  1  0.656  0.752  0.251  1.0
  Sn  Sn10  1  0.341  0.251  0.750  1.0
  Sn  Sn11  1  0.999  0.998  0.501  1.0
  P  P12  1  0.089  0.585  0.862  1.0
  P  P13  1  0.693  0.443  0.623  1.0
  P  P14  1  0.909  0.414  0.138  1.0
  P  P15  1  0.239  0.944  0.124  1.0
  P  P16  1  0.463  0.088  0.362  1.0
  P  P17  1  0.541  0.913  0.638  1.0
  P  P18  1  0.307  0.557  0.376  1.0
  P  P19  1  0.758  0.055  0.876  1.0
  O  O20  1  0.731  0.321  0.110  1.0
  O  O21  1  0.645  0.918  0.897  1.0
  O  O22  1  0.841  0.821  0.609  1.0
  O  O23  1  0.739  0.332  0.553  1.0
  O  O24  1  0.167  0.386  0.069  1.0
  O  O25  1  0.606  0.383  0.708  1.0
  O  O26  1  0.623  0.168  0.946  1.0
  O  O27  1  0.935  0.988  0.122  1.0
  O  O28  1  0.263  0.670  0.445  1.0
  O  O29  1  0.460  0.581  0.604  1.0
  O  O30  1  0.755  0.575  0.131  1.0
  O  O31  1  0.582  0.140  0.279  1.0
  O  O32  1  0.350  0.083  0.105  1.0
  O  O33  1  0.953  0.490  0.620  1.0
  O  O34  1  0.265  0.677  0.891  1.0
  O  O35  1  0.240  0.423  0.867  1.0
  O  O36  1  0.004  0.639  0.779  1.0
  O  O37  1  0.376  0.834  0.054  1.0
  O  O38  1  0.539  0.074  0.632  1.0
  O  O39  1  0.429  0.858  0.721  1.0
  O  O40  1  0.044  0.514  0.378  1.0
  O  O41  1  0.377  0.884  0.570  1.0
  O  O42  1  0.063  0.010  0.878  1.0
  O  O43  1  0.303  0.883  0.208  1.0
  O  O44  1  0.537  0.419  0.396  1.0
  O  O45  1  0.166  0.183  0.390  1.0
  O  O46  1  0.999  0.363  0.220  1.0
  O  O47  1  0.628  0.115  0.430  1.0
  O  O48  1  0.828  0.613  0.930  1.0
  O  O49  1  0.693  0.115  0.792  1.0
  O  O50  1  0.399  0.616  0.291  1.0
  O  O51  1  0.462  0.927  0.368  1.0
[/CIF]
.