The material described by SmPm3 is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. Sm(1) is bonded to four equivalent Pm(2) and eight equivalent Pm(1) atoms to form SmPm12 cuboctahedra that share corners with four equivalent Sm(1)Pm12 cuboctahedra, corners with eight equivalent Pm(2)Pm8Sm4 cuboctahedra, edges with eight equivalent Sm(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Sm4 cuboctahedra, faces with four equivalent Sm(1)Pm12 cuboctahedra, faces with six equivalent Pm(2)Pm8Sm4 cuboctahedra, and faces with eight equivalent Pm(1)Pm8Sm4 cuboctahedra. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to four equivalent Sm(1), four equivalent Pm(1), and four equivalent Pm(2) atoms to form PmPm8Sm4 cuboctahedra that share corners with twelve equivalent Pm(1)Pm8Sm4 cuboctahedra, edges with eight equivalent Sm(1)Pm12 cuboctahedra, edges with eight equivalent Pm(1)Pm8Sm4 cuboctahedra, edges with eight equivalent Pm(2)Pm8Sm4 cuboctahedra, faces with four equivalent Sm(1)Pm12 cuboctahedra, faces with four equivalent Pm(2)Pm8Sm4 cuboctahedra, and faces with ten equivalent Pm(1)Pm8Sm4 cuboctahedra. In the second Pm site, Pm(2) is bonded to four equivalent Sm(1) and eight equivalent Pm(1) atoms to form PmPm8Sm4 cuboctahedra that share corners with four equivalent Pm(2)Pm8Sm4 cuboctahedra, corners with eight equivalent Sm(1)Pm12 cuboctahedra, edges with eight equivalent Pm(2)Pm8Sm4 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Sm4 cuboctahedra, faces with four equivalent Pm(2)Pm8Sm4 cuboctahedra, faces with six equivalent Sm(1)Pm12 cuboctahedra, and faces with eight equivalent Pm(1)Pm8Sm4 cuboctahedra. is represented by the CIF file [CIF]
data_Pm3Sm
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.327
_cell_length_b   6.327
_cell_length_c   6.327
_cell_angle_alpha   131.880
_cell_angle_beta   131.880
_cell_angle_gamma   70.419
_symmetry_Int_Tables_number   1
_cell_volume   137.557
_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
  Pm  Pm0  1  0.750  0.250  0.500  1.0
  Pm  Pm1  1  0.250  0.750  0.500  1.0
  Pm  Pm2  1  0.500  0.500  0.000  1.0
  Sm  Sm3  1  0.000  0.000  0.000  1.0
[/CIF]
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The material described by SmPm3 is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. Sm(1) is bonded to four equivalent Pm(2) and eight equivalent Pm(1) atoms to form SmPm12 cuboctahedra that share corners with four equivalent Sm(1)Pm12 cuboctahedra, corners with eight equivalent Pm(2)Pm8Sm4 cuboctahedra, edges with eight equivalent Sm(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Sm4 cuboctahedra, faces with four equivalent Sm(1)Pm12 cuboctahedra, faces with six equivalent Pm(2)Pm8Sm4 cuboctahedra, and faces with eight equivalent Pm(1)Pm8Sm4 cuboctahedra. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to four equivalent Sm(1), four equivalent Pm(1), and four equivalent Pm(2) atoms to form PmPm8Sm4 cuboctahedra that share corners with twelve equivalent Pm(1)Pm8Sm4 cuboctahedra, edges with eight equivalent Sm(1)Pm12 cuboctahedra, edges with eight equivalent Pm(1)Pm8Sm4 cuboctahedra, edges with eight equivalent Pm(2)Pm8Sm4 cuboctahedra, faces with four equivalent Sm(1)Pm12 cuboctahedra, faces with four equivalent Pm(2)Pm8Sm4 cuboctahedra, and faces with ten equivalent Pm(1)Pm8Sm4 cuboctahedra. In the second Pm site, Pm(2) is bonded to four equivalent Sm(1) and eight equivalent Pm(1) atoms to form PmPm8Sm4 cuboctahedra that share corners with four equivalent Pm(2)Pm8Sm4 cuboctahedra, corners with eight equivalent Sm(1)Pm12 cuboctahedra, edges with eight equivalent Pm(2)Pm8Sm4 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Sm4 cuboctahedra, faces with four equivalent Pm(2)Pm8Sm4 cuboctahedra, faces with six equivalent Sm(1)Pm12 cuboctahedra, and faces with eight equivalent Pm(1)Pm8Sm4 cuboctahedra. is represented by the CIF file [CIF]
data_Pm3Sm
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.327
_cell_length_b   6.327
_cell_length_c   6.327
_cell_angle_alpha   131.880
_cell_angle_beta   131.880
_cell_angle_gamma   70.419
_symmetry_Int_Tables_number   1
_cell_volume   137.557
_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
  Pm  Pm0  1  0.750  0.250  0.500  1.0
  Pm  Pm1  1  0.250  0.750  0.500  1.0
  Pm  Pm2  1  0.500  0.500  0.000  1.0
  Sm  Sm3  1  0.000  0.000  0.000  1.0
[/CIF]
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