The structure described by Cu5Sn2Te7 is Enargite-like structured and crystallizes in the monoclinic C2 space group. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent Te(2) and two equivalent Te(3) atoms to form CuTe4 tetrahedra that share corners with two equivalent Cu(2)Te4 tetrahedra, corners with four equivalent Sn(1)Te4 tetrahedra, and corners with six equivalent Cu(3)Te4 tetrahedra. In the second Cu site, Cu(2) is bonded to one Te(1), one Te(3), and two equivalent Te(4) atoms to form CuTe4 tetrahedra that share  a cornercorner with one Cu(1)Te4 tetrahedra, corners with three equivalent Cu(2)Te4 tetrahedra, corners with three equivalent Cu(3)Te4 tetrahedra, and corners with five equivalent Sn(1)Te4 tetrahedra. In the third Cu site, Cu(3) is bonded to one Te(3), one Te(4), and two equivalent Te(2) atoms to form CuTe4 tetrahedra that share corners with two equivalent Cu(3)Te4 tetrahedra, corners with three equivalent Cu(1)Te4 tetrahedra, corners with three equivalent Cu(2)Te4 tetrahedra, and corners with four equivalent Sn(1)Te4 tetrahedra. Sn(1) is bonded to one Te(1), one Te(2), one Te(3), and one Te(4) atom to form SnTe4 tetrahedra that share  a cornercorner with one Sn(1)Te4 tetrahedra, corners with two equivalent Cu(1)Te4 tetrahedra, corners with four equivalent Cu(3)Te4 tetrahedra, and corners with five equivalent Cu(2)Te4 tetrahedra. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded to two equivalent Cu(2) and two equivalent Sn(1) atoms to form corner-sharing TeCu2Sn2 tetrahedra. In the second Te site, Te(2) is bonded to one Cu(1), two equivalent Cu(3), and one Sn(1) atom to form TeCu3Sn tetrahedra that share  a cornercorner with one Te(1)Cu2Sn2 tetrahedra, corners with three equivalent Te(2)Cu3Sn tetrahedra, corners with three equivalent Te(4)Cu3Sn tetrahedra, and corners with five equivalent Te(3)Cu3Sn tetrahedra. In the third Te site, Te(3) is bonded to one Cu(1), one Cu(2), one Cu(3), and one Sn(1) atom to form TeCu3Sn tetrahedra that share  a cornercorner with one Te(3)Cu3Sn tetrahedra, corners with two equivalent Te(1)Cu2Sn2 tetrahedra, corners with four equivalent Te(4)Cu3Sn tetrahedra, and corners with five equivalent Te(2)Cu3Sn tetrahedra. In the fourth Te site, Te(4) is bonded to one Cu(3), two equivalent Cu(2), and one Sn(1) atom to form TeCu3Sn tetrahedra that share corners with two equivalent Te(4)Cu3Sn tetrahedra, corners with three equivalent Te(1)Cu2Sn2 tetrahedra, corners with three equivalent Te(2)Cu3Sn tetrahedra, and corners with four equivalent Te(3)Cu3Sn tetrahedra. is represented by the CIF file [CIF]
data_Cu5Sn2Te7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.443
_cell_length_b   7.443
_cell_length_c   9.599
_cell_angle_alpha   82.641
_cell_angle_beta   82.641
_cell_angle_gamma   48.169
_symmetry_Int_Tables_number   1
_cell_volume   392.309
_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
  Cu  Cu0  1  0.734  0.266  0.500  1.0
  Cu  Cu1  1  0.883  0.407  0.073  1.0
  Cu  Cu2  1  0.593  0.117  0.927  1.0
  Cu  Cu3  1  0.448  0.981  0.358  1.0
  Cu  Cu4  1  0.019  0.552  0.642  1.0
  Sn  Sn5  1  0.149  0.703  0.224  1.0
  Sn  Sn6  1  0.297  0.851  0.776  1.0
  Te  Te7  1  0.517  0.483  0.000  1.0
  Te  Te8  1  0.355  0.349  0.445  1.0
  Te  Te9  1  0.651  0.645  0.555  1.0
  Te  Te10  1  0.049  0.117  0.292  1.0
  Te  Te11  1  0.883  0.951  0.708  1.0
  Te  Te12  1  0.739  0.811  0.138  1.0
  Te  Te13  1  0.189  0.261  0.862  1.0
[/CIF]
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The structure described by Cu5Sn2Te7 is Enargite-like structured and crystallizes in the monoclinic C2 space group. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent Te(2) and two equivalent Te(3) atoms to form CuTe4 tetrahedra that share corners with two equivalent Cu(2)Te4 tetrahedra, corners with four equivalent Sn(1)Te4 tetrahedra, and corners with six equivalent Cu(3)Te4 tetrahedra. In the second Cu site, Cu(2) is bonded to one Te(1), one Te(3), and two equivalent Te(4) atoms to form CuTe4 tetrahedra that share  a cornercorner with one Cu(1)Te4 tetrahedra, corners with three equivalent Cu(2)Te4 tetrahedra, corners with three equivalent Cu(3)Te4 tetrahedra, and corners with five equivalent Sn(1)Te4 tetrahedra. In the third Cu site, Cu(3) is bonded to one Te(3), one Te(4), and two equivalent Te(2) atoms to form CuTe4 tetrahedra that share corners with two equivalent Cu(3)Te4 tetrahedra, corners with three equivalent Cu(1)Te4 tetrahedra, corners with three equivalent Cu(2)Te4 tetrahedra, and corners with four equivalent Sn(1)Te4 tetrahedra. Sn(1) is bonded to one Te(1), one Te(2), one Te(3), and one Te(4) atom to form SnTe4 tetrahedra that share  a cornercorner with one Sn(1)Te4 tetrahedra, corners with two equivalent Cu(1)Te4 tetrahedra, corners with four equivalent Cu(3)Te4 tetrahedra, and corners with five equivalent Cu(2)Te4 tetrahedra. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded to two equivalent Cu(2) and two equivalent Sn(1) atoms to form corner-sharing TeCu2Sn2 tetrahedra. In the second Te site, Te(2) is bonded to one Cu(1), two equivalent Cu(3), and one Sn(1) atom to form TeCu3Sn tetrahedra that share  a cornercorner with one Te(1)Cu2Sn2 tetrahedra, corners with three equivalent Te(2)Cu3Sn tetrahedra, corners with three equivalent Te(4)Cu3Sn tetrahedra, and corners with five equivalent Te(3)Cu3Sn tetrahedra. In the third Te site, Te(3) is bonded to one Cu(1), one Cu(2), one Cu(3), and one Sn(1) atom to form TeCu3Sn tetrahedra that share  a cornercorner with one Te(3)Cu3Sn tetrahedra, corners with two equivalent Te(1)Cu2Sn2 tetrahedra, corners with four equivalent Te(4)Cu3Sn tetrahedra, and corners with five equivalent Te(2)Cu3Sn tetrahedra. In the fourth Te site, Te(4) is bonded to one Cu(3), two equivalent Cu(2), and one Sn(1) atom to form TeCu3Sn tetrahedra that share corners with two equivalent Te(4)Cu3Sn tetrahedra, corners with three equivalent Te(1)Cu2Sn2 tetrahedra, corners with three equivalent Te(2)Cu3Sn tetrahedra, and corners with four equivalent Te(3)Cu3Sn tetrahedra. is represented by the CIF file [CIF]
data_Cu5Sn2Te7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.443
_cell_length_b   7.443
_cell_length_c   9.599
_cell_angle_alpha   82.641
_cell_angle_beta   82.641
_cell_angle_gamma   48.169
_symmetry_Int_Tables_number   1
_cell_volume   392.309
_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
  Cu  Cu0  1  0.734  0.266  0.500  1.0
  Cu  Cu1  1  0.883  0.407  0.073  1.0
  Cu  Cu2  1  0.593  0.117  0.927  1.0
  Cu  Cu3  1  0.448  0.981  0.358  1.0
  Cu  Cu4  1  0.019  0.552  0.642  1.0
  Sn  Sn5  1  0.149  0.703  0.224  1.0
  Sn  Sn6  1  0.297  0.851  0.776  1.0
  Te  Te7  1  0.517  0.483  0.000  1.0
  Te  Te8  1  0.355  0.349  0.445  1.0
  Te  Te9  1  0.651  0.645  0.555  1.0
  Te  Te10  1  0.049  0.117  0.292  1.0
  Te  Te11  1  0.883  0.951  0.708  1.0
  Te  Te12  1  0.739  0.811  0.138  1.0
  Te  Te13  1  0.189  0.261  0.862  1.0
[/CIF]
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