The structure described by SmMn6Sn6 crystallizes in the orthorhombic Immm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to one Sn(1), one Sn(6), two equivalent Sn(3), two equivalent Sn(5), and two equivalent Sn(8) atoms to form distorted edge-sharing SmSn8 hexagonal bipyramids. In the second Sm site, Sm(2) is bonded to two equivalent Sn(3), two equivalent Sn(7), and four equivalent Sn(1) atoms to form distorted edge-sharing SmSn8 hexagonal bipyramids. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 6-coordinate geometry to two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(7) atoms. In the second Mn site, Mn(2) is bonded in a 6-coordinate geometry to two equivalent Sn(5), two equivalent Sn(6), and two equivalent Sn(8) atoms. In the third Mn site, Mn(3) is bonded in a 6-coordinate geometry to one Sn(3), one Sn(4), one Sn(5), one Sn(6), and two equivalent Sn(8) atoms. In the fourth Mn site, Mn(4) is bonded in a 6-coordinate geometry to one Sn(1), one Sn(2), one Sn(3), one Sn(4), one Sn(7), and one Sn(8) atom. There are eight inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to one Sm(1), two equivalent Sm(2), two equivalent Mn(1), and four equivalent Mn(4) atoms. In the second Sn site, Sn(2) is bonded in a 6-coordinate geometry to two equivalent Mn(1) and four equivalent Mn(4) atoms. In the third Sn site, Sn(3) is bonded in a 9-coordinate geometry to one Sm(2), two equivalent Sm(1), two equivalent Mn(3), and four equivalent Mn(4) atoms. In the fourth Sn site, Sn(4) is bonded in a 6-coordinate geometry to two equivalent Mn(3) and four equivalent Mn(4) atoms. In the fifth Sn site, Sn(5) is bonded in a 8-coordinate geometry to two equivalent Sm(1), two equivalent Mn(3), and four equivalent Mn(2) atoms. In the sixth Sn site, Sn(6) is bonded in a 7-coordinate geometry to one Sm(1), two equivalent Mn(3), and four equivalent Mn(2) atoms. In the seventh Sn site, Sn(7) is bonded in a 8-coordinate geometry to one Sm(2), two equivalent Mn(1), four equivalent Mn(4), and one Sn(7) atom. In the eighth Sn site, Sn(8) is bonded in a 8-coordinate geometry to one Sm(1), two equivalent Mn(2), two equivalent Mn(3), two equivalent Mn(4), and one Sn(8) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sm(MnSn)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   15.174
_cell_length_b   15.174
_cell_length_c   15.174
_cell_angle_alpha   159.144
_cell_angle_beta   145.310
_cell_angle_gamma   40.823
_symmetry_Int_Tables_number   1
_cell_volume   706.799
_cell_formula_units_Z   3
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
  Sm  Sm0  1  0.169  0.669  0.500  1.0
  Sm  Sm1  1  0.831  0.331  0.500  1.0
  Sm  Sm2  1  0.000  0.000  0.000  1.0
  Mn  Mn3  1  0.249  0.500  0.749  1.0
  Mn  Mn4  1  0.751  0.500  0.251  1.0
  Mn  Mn5  1  0.500  0.000  0.000  1.0
  Mn  Mn6  1  0.000  0.000  0.500  1.0
  Mn  Mn7  1  0.000  0.500  0.000  1.0
  Mn  Mn8  1  0.500  0.500  0.500  1.0
  Mn  Mn9  1  0.583  0.833  0.750  1.0
  Mn  Mn10  1  0.917  0.167  0.750  1.0
  Mn  Mn11  1  0.083  0.833  0.250  1.0
  Mn  Mn12  1  0.417  0.167  0.250  1.0
  Mn  Mn13  1  0.332  0.834  1.000  1.0
  Mn  Mn14  1  0.166  0.166  0.498  1.0
  Mn  Mn15  1  0.834  0.333  0.000  1.0
  Mn  Mn16  1  0.668  0.667  0.502  1.0
  Mn  Mn17  1  0.668  0.166  0.000  1.0
  Mn  Mn18  1  0.834  0.834  0.502  1.0
  Mn  Mn19  1  0.166  0.667  1.000  1.0
  Mn  Mn20  1  0.332  0.333  0.498  1.0
  Sn  Sn21  1  0.056  0.556  0.500  1.0
  Sn  Sn22  1  0.944  0.444  0.500  1.0
  Sn  Sn23  1  0.555  0.555  0.000  1.0
  Sn  Sn24  1  0.445  0.445  0.000  1.0
  Sn  Sn25  1  0.112  0.112  0.000  1.0
  Sn  Sn26  1  0.888  0.888  0.000  1.0
  Sn  Sn27  1  0.610  0.110  0.500  1.0
  Sn  Sn28  1  0.390  0.890  0.500  1.0
  Sn  Sn29  1  0.224  0.224  0.000  1.0
  Sn  Sn30  1  0.776  0.776  0.000  1.0
  Sn  Sn31  1  0.720  0.220  0.500  1.0
  Sn  Sn32  1  0.280  0.780  0.500  1.0
  Sn  Sn33  1  0.334  0.000  0.334  1.0
  Sn  Sn34  1  0.666  0.000  0.666  1.0
  Sn  Sn35  1  0.500  0.666  0.834  1.0
  Sn  Sn36  1  0.167  0.334  0.834  1.0
  Sn  Sn37  1  0.833  0.666  0.166  1.0
  Sn  Sn38  1  0.500  0.334  0.166  1.0
[/CIF]
.
The structure described by SmMn6Sn6 crystallizes in the orthorhombic Immm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to one Sn(1), one Sn(6), two equivalent Sn(3), two equivalent Sn(5), and two equivalent Sn(8) atoms to form distorted edge-sharing SmSn8 hexagonal bipyramids. In the second Sm site, Sm(2) is bonded to two equivalent Sn(3), two equivalent Sn(7), and four equivalent Sn(1) atoms to form distorted edge-sharing SmSn8 hexagonal bipyramids. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 6-coordinate geometry to two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(7) atoms. In the second Mn site, Mn(2) is bonded in a 6-coordinate geometry to two equivalent Sn(5), two equivalent Sn(6), and two equivalent Sn(8) atoms. In the third Mn site, Mn(3) is bonded in a 6-coordinate geometry to one Sn(3), one Sn(4), one Sn(5), one Sn(6), and two equivalent Sn(8) atoms. In the fourth Mn site, Mn(4) is bonded in a 6-coordinate geometry to one Sn(1), one Sn(2), one Sn(3), one Sn(4), one Sn(7), and one Sn(8) atom. There are eight inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to one Sm(1), two equivalent Sm(2), two equivalent Mn(1), and four equivalent Mn(4) atoms. In the second Sn site, Sn(2) is bonded in a 6-coordinate geometry to two equivalent Mn(1) and four equivalent Mn(4) atoms. In the third Sn site, Sn(3) is bonded in a 9-coordinate geometry to one Sm(2), two equivalent Sm(1), two equivalent Mn(3), and four equivalent Mn(4) atoms. In the fourth Sn site, Sn(4) is bonded in a 6-coordinate geometry to two equivalent Mn(3) and four equivalent Mn(4) atoms. In the fifth Sn site, Sn(5) is bonded in a 8-coordinate geometry to two equivalent Sm(1), two equivalent Mn(3), and four equivalent Mn(2) atoms. In the sixth Sn site, Sn(6) is bonded in a 7-coordinate geometry to one Sm(1), two equivalent Mn(3), and four equivalent Mn(2) atoms. In the seventh Sn site, Sn(7) is bonded in a 8-coordinate geometry to one Sm(2), two equivalent Mn(1), four equivalent Mn(4), and one Sn(7) atom. In the eighth Sn site, Sn(8) is bonded in a 8-coordinate geometry to one Sm(1), two equivalent Mn(2), two equivalent Mn(3), two equivalent Mn(4), and one Sn(8) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sm(MnSn)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   15.174
_cell_length_b   15.174
_cell_length_c   15.174
_cell_angle_alpha   159.144
_cell_angle_beta   145.310
_cell_angle_gamma   40.823
_symmetry_Int_Tables_number   1
_cell_volume   706.799
_cell_formula_units_Z   3
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
  Sm  Sm0  1  0.169  0.669  0.500  1.0
  Sm  Sm1  1  0.831  0.331  0.500  1.0
  Sm  Sm2  1  0.000  0.000  0.000  1.0
  Mn  Mn3  1  0.249  0.500  0.749  1.0
  Mn  Mn4  1  0.751  0.500  0.251  1.0
  Mn  Mn5  1  0.500  0.000  0.000  1.0
  Mn  Mn6  1  0.000  0.000  0.500  1.0
  Mn  Mn7  1  0.000  0.500  0.000  1.0
  Mn  Mn8  1  0.500  0.500  0.500  1.0
  Mn  Mn9  1  0.583  0.833  0.750  1.0
  Mn  Mn10  1  0.917  0.167  0.750  1.0
  Mn  Mn11  1  0.083  0.833  0.250  1.0
  Mn  Mn12  1  0.417  0.167  0.250  1.0
  Mn  Mn13  1  0.332  0.834  1.000  1.0
  Mn  Mn14  1  0.166  0.166  0.498  1.0
  Mn  Mn15  1  0.834  0.333  0.000  1.0
  Mn  Mn16  1  0.668  0.667  0.502  1.0
  Mn  Mn17  1  0.668  0.166  0.000  1.0
  Mn  Mn18  1  0.834  0.834  0.502  1.0
  Mn  Mn19  1  0.166  0.667  1.000  1.0
  Mn  Mn20  1  0.332  0.333  0.498  1.0
  Sn  Sn21  1  0.056  0.556  0.500  1.0
  Sn  Sn22  1  0.944  0.444  0.500  1.0
  Sn  Sn23  1  0.555  0.555  0.000  1.0
  Sn  Sn24  1  0.445  0.445  0.000  1.0
  Sn  Sn25  1  0.112  0.112  0.000  1.0
  Sn  Sn26  1  0.888  0.888  0.000  1.0
  Sn  Sn27  1  0.610  0.110  0.500  1.0
  Sn  Sn28  1  0.390  0.890  0.500  1.0
  Sn  Sn29  1  0.224  0.224  0.000  1.0
  Sn  Sn30  1  0.776  0.776  0.000  1.0
  Sn  Sn31  1  0.720  0.220  0.500  1.0
  Sn  Sn32  1  0.280  0.780  0.500  1.0
  Sn  Sn33  1  0.334  0.000  0.334  1.0
  Sn  Sn34  1  0.666  0.000  0.666  1.0
  Sn  Sn35  1  0.500  0.666  0.834  1.0
  Sn  Sn36  1  0.167  0.334  0.834  1.0
  Sn  Sn37  1  0.833  0.666  0.166  1.0
  Sn  Sn38  1  0.500  0.334  0.166  1.0
[/CIF]
.