The crystal structure described by TaPt3 is beta Cu3Ti-like structured and crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one Pt(1), two equivalent Pt(2), three equivalent Pt(4), and six equivalent Pt(3) atoms to form TaPt12 cuboctahedra that share  a cornercorner with one Ta(2)Pt12 cuboctahedra, corners with two equivalent Ta(1)Pt12 cuboctahedra, corners with four equivalent Pt(2)Ta4Pt8 cuboctahedra, edges with three equivalent Ta(2)Pt12 cuboctahedra, edges with four equivalent Ta(1)Pt12 cuboctahedra, edges with six equivalent Pt(2)Ta4Pt8 cuboctahedra, edges with eight equivalent Pt(3)Ta4Pt8 cuboctahedra, faces with two equivalent Ta(1)Pt12 cuboctahedra, faces with two equivalent Pt(2)Ta4Pt8 cuboctahedra, faces with three equivalent Ta(2)Pt12 cuboctahedra, and faces with six equivalent Pt(3)Ta4Pt8 cuboctahedra. In the second Ta site, Ta(2) is bonded to one Pt(4), two equivalent Pt(3), three equivalent Pt(1), and six equivalent Pt(2) atoms to form TaPt12 cuboctahedra that share  a cornercorner with one Ta(1)Pt12 cuboctahedra, corners with two equivalent Ta(2)Pt12 cuboctahedra, corners with four equivalent Pt(3)Ta4Pt8 cuboctahedra, edges with three equivalent Ta(1)Pt12 cuboctahedra, edges with four equivalent Ta(2)Pt12 cuboctahedra, edges with six equivalent Pt(3)Ta4Pt8 cuboctahedra, edges with eight equivalent Pt(2)Ta4Pt8 cuboctahedra, faces with two equivalent Ta(2)Pt12 cuboctahedra, faces with two equivalent Pt(3)Ta4Pt8 cuboctahedra, faces with three equivalent Ta(1)Pt12 cuboctahedra, and faces with six equivalent Pt(2)Ta4Pt8 cuboctahedra. There are four inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a distorted square co-planar geometry to one Ta(1), three equivalent Ta(2), two equivalent Pt(3), and six equivalent Pt(2) atoms. In the second Pt site, Pt(2) is bonded to one Ta(1), three equivalent Ta(2), one Pt(3), one Pt(4), three equivalent Pt(1), and three equivalent Pt(2) atoms to form distorted PtTa4Pt8 cuboctahedra that share corners with two equivalent Ta(1)Pt12 cuboctahedra, corners with five equivalent Pt(3)Ta4Pt8 cuboctahedra, corners with six equivalent Pt(2)Ta4Pt8 cuboctahedra, edges with three equivalent Ta(1)Pt12 cuboctahedra, edges with three equivalent Pt(3)Ta4Pt8 cuboctahedra, edges with four equivalent Ta(2)Pt12 cuboctahedra, edges with four equivalent Pt(2)Ta4Pt8 cuboctahedra,  a faceface with one Ta(1)Pt12 cuboctahedra, faces with three equivalent Ta(2)Pt12 cuboctahedra, faces with five equivalent Pt(3)Ta4Pt8 cuboctahedra, and faces with six equivalent Pt(2)Ta4Pt8 cuboctahedra. In the third Pt site, Pt(3) is bonded to one Ta(2), three equivalent Ta(1), one Pt(1), one Pt(2), three equivalent Pt(3), and three equivalent Pt(4) atoms to form distorted PtTa4Pt8 cuboctahedra that share corners with two equivalent Ta(2)Pt12 cuboctahedra, corners with five equivalent Pt(2)Ta4Pt8 cuboctahedra, corners with six equivalent Pt(3)Ta4Pt8 cuboctahedra, edges with three equivalent Ta(2)Pt12 cuboctahedra, edges with three equivalent Pt(2)Ta4Pt8 cuboctahedra, edges with four equivalent Ta(1)Pt12 cuboctahedra, edges with four equivalent Pt(3)Ta4Pt8 cuboctahedra,  a faceface with one Ta(2)Pt12 cuboctahedra, faces with three equivalent Ta(1)Pt12 cuboctahedra, faces with five equivalent Pt(2)Ta4Pt8 cuboctahedra, and faces with six equivalent Pt(3)Ta4Pt8 cuboctahedra. In the fourth Pt site, Pt(4) is bonded in a distorted see-saw-like geometry to one Ta(2), three equivalent Ta(1), two equivalent Pt(2), and six equivalent Pt(3) atoms. is represented by the CIF card [CIF]
data_TaPt3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.896
_cell_length_b   5.569
_cell_length_c   9.336
_cell_angle_alpha   90.000
_cell_angle_beta   79.406
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   250.220
_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
  Pt  Pt0  1  0.207  0.750  0.372  1.0
  Pt  Pt1  1  0.708  0.999  0.377  1.0
  Pt  Pt2  1  0.120  0.501  0.126  1.0
  Pt  Pt3  1  0.708  0.501  0.377  1.0
  Pt  Pt4  1  0.292  0.499  0.623  1.0
  Pt  Pt5  1  0.608  0.250  0.124  1.0
  Pt  Pt6  1  0.880  0.499  0.874  1.0
  Pt  Pt7  1  0.793  0.250  0.628  1.0
  Pt  Pt8  1  0.392  0.750  0.876  1.0
  Pt  Pt9  1  0.880  0.001  0.874  1.0
  Pt  Pt10  1  0.292  0.001  0.623  1.0
  Pt  Pt11  1  0.120  0.999  0.126  1.0
  Ta  Ta12  1  0.379  0.250  0.878  1.0
  Ta  Ta13  1  0.788  0.750  0.627  1.0
  Ta  Ta14  1  0.212  0.250  0.373  1.0
  Ta  Ta15  1  0.621  0.750  0.122  1.0
[/CIF]
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The crystal structure described by TaPt3 is beta Cu3Ti-like structured and crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one Pt(1), two equivalent Pt(2), three equivalent Pt(4), and six equivalent Pt(3) atoms to form TaPt12 cuboctahedra that share  a cornercorner with one Ta(2)Pt12 cuboctahedra, corners with two equivalent Ta(1)Pt12 cuboctahedra, corners with four equivalent Pt(2)Ta4Pt8 cuboctahedra, edges with three equivalent Ta(2)Pt12 cuboctahedra, edges with four equivalent Ta(1)Pt12 cuboctahedra, edges with six equivalent Pt(2)Ta4Pt8 cuboctahedra, edges with eight equivalent Pt(3)Ta4Pt8 cuboctahedra, faces with two equivalent Ta(1)Pt12 cuboctahedra, faces with two equivalent Pt(2)Ta4Pt8 cuboctahedra, faces with three equivalent Ta(2)Pt12 cuboctahedra, and faces with six equivalent Pt(3)Ta4Pt8 cuboctahedra. In the second Ta site, Ta(2) is bonded to one Pt(4), two equivalent Pt(3), three equivalent Pt(1), and six equivalent Pt(2) atoms to form TaPt12 cuboctahedra that share  a cornercorner with one Ta(1)Pt12 cuboctahedra, corners with two equivalent Ta(2)Pt12 cuboctahedra, corners with four equivalent Pt(3)Ta4Pt8 cuboctahedra, edges with three equivalent Ta(1)Pt12 cuboctahedra, edges with four equivalent Ta(2)Pt12 cuboctahedra, edges with six equivalent Pt(3)Ta4Pt8 cuboctahedra, edges with eight equivalent Pt(2)Ta4Pt8 cuboctahedra, faces with two equivalent Ta(2)Pt12 cuboctahedra, faces with two equivalent Pt(3)Ta4Pt8 cuboctahedra, faces with three equivalent Ta(1)Pt12 cuboctahedra, and faces with six equivalent Pt(2)Ta4Pt8 cuboctahedra. There are four inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a distorted square co-planar geometry to one Ta(1), three equivalent Ta(2), two equivalent Pt(3), and six equivalent Pt(2) atoms. In the second Pt site, Pt(2) is bonded to one Ta(1), three equivalent Ta(2), one Pt(3), one Pt(4), three equivalent Pt(1), and three equivalent Pt(2) atoms to form distorted PtTa4Pt8 cuboctahedra that share corners with two equivalent Ta(1)Pt12 cuboctahedra, corners with five equivalent Pt(3)Ta4Pt8 cuboctahedra, corners with six equivalent Pt(2)Ta4Pt8 cuboctahedra, edges with three equivalent Ta(1)Pt12 cuboctahedra, edges with three equivalent Pt(3)Ta4Pt8 cuboctahedra, edges with four equivalent Ta(2)Pt12 cuboctahedra, edges with four equivalent Pt(2)Ta4Pt8 cuboctahedra,  a faceface with one Ta(1)Pt12 cuboctahedra, faces with three equivalent Ta(2)Pt12 cuboctahedra, faces with five equivalent Pt(3)Ta4Pt8 cuboctahedra, and faces with six equivalent Pt(2)Ta4Pt8 cuboctahedra. In the third Pt site, Pt(3) is bonded to one Ta(2), three equivalent Ta(1), one Pt(1), one Pt(2), three equivalent Pt(3), and three equivalent Pt(4) atoms to form distorted PtTa4Pt8 cuboctahedra that share corners with two equivalent Ta(2)Pt12 cuboctahedra, corners with five equivalent Pt(2)Ta4Pt8 cuboctahedra, corners with six equivalent Pt(3)Ta4Pt8 cuboctahedra, edges with three equivalent Ta(2)Pt12 cuboctahedra, edges with three equivalent Pt(2)Ta4Pt8 cuboctahedra, edges with four equivalent Ta(1)Pt12 cuboctahedra, edges with four equivalent Pt(3)Ta4Pt8 cuboctahedra,  a faceface with one Ta(2)Pt12 cuboctahedra, faces with three equivalent Ta(1)Pt12 cuboctahedra, faces with five equivalent Pt(2)Ta4Pt8 cuboctahedra, and faces with six equivalent Pt(3)Ta4Pt8 cuboctahedra. In the fourth Pt site, Pt(4) is bonded in a distorted see-saw-like geometry to one Ta(2), three equivalent Ta(1), two equivalent Pt(2), and six equivalent Pt(3) atoms. is represented by the CIF card [CIF]
data_TaPt3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.896
_cell_length_b   5.569
_cell_length_c   9.336
_cell_angle_alpha   90.000
_cell_angle_beta   79.406
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   250.220
_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
  Pt  Pt0  1  0.207  0.750  0.372  1.0
  Pt  Pt1  1  0.708  0.999  0.377  1.0
  Pt  Pt2  1  0.120  0.501  0.126  1.0
  Pt  Pt3  1  0.708  0.501  0.377  1.0
  Pt  Pt4  1  0.292  0.499  0.623  1.0
  Pt  Pt5  1  0.608  0.250  0.124  1.0
  Pt  Pt6  1  0.880  0.499  0.874  1.0
  Pt  Pt7  1  0.793  0.250  0.628  1.0
  Pt  Pt8  1  0.392  0.750  0.876  1.0
  Pt  Pt9  1  0.880  0.001  0.874  1.0
  Pt  Pt10  1  0.292  0.001  0.623  1.0
  Pt  Pt11  1  0.120  0.999  0.126  1.0
  Ta  Ta12  1  0.379  0.250  0.878  1.0
  Ta  Ta13  1  0.788  0.750  0.627  1.0
  Ta  Ta14  1  0.212  0.250  0.373  1.0
  Ta  Ta15  1  0.621  0.750  0.122  1.0
[/CIF]
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