The structure described by Ta3Os2 crystallizes in the orthorhombic Cmm2 space group. There are seven inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 15-coordinate geometry to one Ta(1), one Ta(6), two equivalent Ta(3), two equivalent Ta(5), two equivalent Ta(7), one Os(5), two equivalent Os(2), and four equivalent Os(4) atoms. In the second Ta site, Ta(2) is bonded in a 11-coordinate geometry to one Ta(2), two equivalent Ta(4), two equivalent Os(1), two equivalent Os(5), and four equivalent Os(3) atoms. In the third Ta site, Ta(3) is bonded in a 4-coordinate geometry to one Ta(1), two equivalent Os(3), and two equivalent Os(4) atoms. In the fourth Ta site, Ta(4) is bonded in a 4-coordinate geometry to one Ta(2), two equivalent Os(3), and two equivalent Os(4) atoms. In the fifth Ta site, Ta(5) is bonded in a 7-coordinate geometry to two equivalent Ta(1), two equivalent Ta(7), one Os(2), two equivalent Os(3), and two equivalent Os(4) atoms. In the sixth Ta site, Ta(6) is bonded in a 7-coordinate geometry to one Ta(1), one Os(1), two equivalent Os(3), two equivalent Os(4), and two equivalent Os(5) atoms. In the seventh Ta site, Ta(7) is bonded in a 7-coordinate geometry to two equivalent Ta(1), two equivalent Ta(5), one Os(2), two equivalent Os(3), and two equivalent Os(4) atoms. There are five inequivalent Os sites. In the first Os site, Os(1) is bonded to two equivalent Ta(6), four equivalent Ta(2), two equivalent Os(5), and four equivalent Os(3) atoms to form distorted OsTa6Os6 cuboctahedra that share corners with eight equivalent Os(3)Ta9Os3 cuboctahedra, corners with eight equivalent Os(4)Ta9Os3 cuboctahedra, edges with two equivalent Os(1)Ta6Os6 cuboctahedra, and faces with four equivalent Os(3)Ta9Os3 cuboctahedra. In the second Os site, Os(2) is bonded to two equivalent Ta(5), two equivalent Ta(7), four equivalent Ta(1), and four equivalent Os(4) atoms to form OsTa8Os4 cuboctahedra that share corners with eight equivalent Os(3)Ta9Os3 cuboctahedra, corners with eight equivalent Os(4)Ta9Os3 cuboctahedra, edges with two equivalent Os(2)Ta8Os4 cuboctahedra, and faces with four equivalent Os(4)Ta9Os3 cuboctahedra. In the third Os site, Os(3) is bonded to one Ta(5), one Ta(6), one Ta(7), two equivalent Ta(2), two equivalent Ta(3), two equivalent Ta(4), one Os(1), one Os(3), and one Os(5) atom to form distorted OsTa9Os3 cuboctahedra that share corners with two equivalent Os(1)Ta6Os6 cuboctahedra, corners with two equivalent Os(2)Ta8Os4 cuboctahedra, corners with three equivalent Os(3)Ta9Os3 cuboctahedra, corners with four equivalent Os(4)Ta9Os3 cuboctahedra, edges with three equivalent Os(3)Ta9Os3 cuboctahedra,  a faceface with one Os(1)Ta6Os6 cuboctahedra, faces with two equivalent Os(3)Ta9Os3 cuboctahedra, and faces with four equivalent Os(4)Ta9Os3 cuboctahedra. In the fourth Os site, Os(4) is bonded to one Ta(5), one Ta(6), one Ta(7), two equivalent Ta(1), two equivalent Ta(3), two equivalent Ta(4), one Os(2), one Os(4), and one Os(5) atom to form distorted OsTa9Os3 cuboctahedra that share corners with two equivalent Os(1)Ta6Os6 cuboctahedra, corners with two equivalent Os(2)Ta8Os4 cuboctahedra, corners with three equivalent Os(4)Ta9Os3 cuboctahedra, corners with four equivalent Os(3)Ta9Os3 cuboctahedra, edges with three equivalent Os(4)Ta9Os3 cuboctahedra,  a faceface with one Os(2)Ta8Os4 cuboctahedra, faces with two equivalent Os(4)Ta9Os3 cuboctahedra, and faces with four equivalent Os(3)Ta9Os3 cuboctahedra. In the fifth Os site, Os(5) is bonded in a distorted linear geometry to one Ta(1), two equivalent Ta(2), two equivalent Ta(6), one Os(1), two equivalent Os(3), and two equivalent Os(4) atoms. is represented by the CIF card [CIF]
data_Ta3Os2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.063
_cell_length_b   9.877
_cell_length_c   9.877
_cell_angle_alpha   90.035
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   493.900
_cell_formula_units_Z   6
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
  Ta  Ta0  1  0.503  0.103  0.897  1.0
  Ta  Ta1  1  0.503  0.897  0.103  1.0
  Ta  Ta2  1  0.995  0.399  0.399  1.0
  Ta  Ta3  1  0.995  0.601  0.601  1.0
  Ta  Ta4  1  0.501  0.370  0.962  1.0
  Ta  Ta5  1  0.501  0.630  0.038  1.0
  Ta  Ta6  1  0.003  0.130  0.465  1.0
  Ta  Ta7  1  0.003  0.870  0.535  1.0
  Ta  Ta8  1  0.501  0.962  0.370  1.0
  Ta  Ta9  1  0.501  0.038  0.630  1.0
  Ta  Ta10  1  0.003  0.465  0.130  1.0
  Ta  Ta11  1  0.003  0.535  0.870  1.0
  Ta  Ta12  1  0.750  0.181  0.181  1.0
  Ta  Ta13  1  0.750  0.819  0.819  1.0
  Ta  Ta14  1  0.750  0.681  0.319  1.0
  Ta  Ta15  1  0.750  0.319  0.681  1.0
  Ta  Ta16  1  0.250  0.818  0.818  1.0
  Ta  Ta17  1  0.250  0.182  0.182  1.0
  Os  Os18  1  0.479  0.500  0.500  1.0
  Os  Os19  1  0.002  0.000  0.000  1.0
  Os  Os20  1  0.500  0.435  0.243  1.0
  Os  Os21  1  0.500  0.565  0.757  1.0
  Os  Os22  1  0.001  0.070  0.741  1.0
  Os  Os23  1  0.001  0.930  0.259  1.0
  Os  Os24  1  0.500  0.243  0.435  1.0
  Os  Os25  1  0.500  0.757  0.565  1.0
  Os  Os26  1  0.001  0.741  0.070  1.0
  Os  Os27  1  0.001  0.259  0.930  1.0
  Os  Os28  1  0.250  0.319  0.681  1.0
  Os  Os29  1  0.250  0.681  0.319  1.0
[/CIF]
.
The structure described by Ta3Os2 crystallizes in the orthorhombic Cmm2 space group. There are seven inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 15-coordinate geometry to one Ta(1), one Ta(6), two equivalent Ta(3), two equivalent Ta(5), two equivalent Ta(7), one Os(5), two equivalent Os(2), and four equivalent Os(4) atoms. In the second Ta site, Ta(2) is bonded in a 11-coordinate geometry to one Ta(2), two equivalent Ta(4), two equivalent Os(1), two equivalent Os(5), and four equivalent Os(3) atoms. In the third Ta site, Ta(3) is bonded in a 4-coordinate geometry to one Ta(1), two equivalent Os(3), and two equivalent Os(4) atoms. In the fourth Ta site, Ta(4) is bonded in a 4-coordinate geometry to one Ta(2), two equivalent Os(3), and two equivalent Os(4) atoms. In the fifth Ta site, Ta(5) is bonded in a 7-coordinate geometry to two equivalent Ta(1), two equivalent Ta(7), one Os(2), two equivalent Os(3), and two equivalent Os(4) atoms. In the sixth Ta site, Ta(6) is bonded in a 7-coordinate geometry to one Ta(1), one Os(1), two equivalent Os(3), two equivalent Os(4), and two equivalent Os(5) atoms. In the seventh Ta site, Ta(7) is bonded in a 7-coordinate geometry to two equivalent Ta(1), two equivalent Ta(5), one Os(2), two equivalent Os(3), and two equivalent Os(4) atoms. There are five inequivalent Os sites. In the first Os site, Os(1) is bonded to two equivalent Ta(6), four equivalent Ta(2), two equivalent Os(5), and four equivalent Os(3) atoms to form distorted OsTa6Os6 cuboctahedra that share corners with eight equivalent Os(3)Ta9Os3 cuboctahedra, corners with eight equivalent Os(4)Ta9Os3 cuboctahedra, edges with two equivalent Os(1)Ta6Os6 cuboctahedra, and faces with four equivalent Os(3)Ta9Os3 cuboctahedra. In the second Os site, Os(2) is bonded to two equivalent Ta(5), two equivalent Ta(7), four equivalent Ta(1), and four equivalent Os(4) atoms to form OsTa8Os4 cuboctahedra that share corners with eight equivalent Os(3)Ta9Os3 cuboctahedra, corners with eight equivalent Os(4)Ta9Os3 cuboctahedra, edges with two equivalent Os(2)Ta8Os4 cuboctahedra, and faces with four equivalent Os(4)Ta9Os3 cuboctahedra. In the third Os site, Os(3) is bonded to one Ta(5), one Ta(6), one Ta(7), two equivalent Ta(2), two equivalent Ta(3), two equivalent Ta(4), one Os(1), one Os(3), and one Os(5) atom to form distorted OsTa9Os3 cuboctahedra that share corners with two equivalent Os(1)Ta6Os6 cuboctahedra, corners with two equivalent Os(2)Ta8Os4 cuboctahedra, corners with three equivalent Os(3)Ta9Os3 cuboctahedra, corners with four equivalent Os(4)Ta9Os3 cuboctahedra, edges with three equivalent Os(3)Ta9Os3 cuboctahedra,  a faceface with one Os(1)Ta6Os6 cuboctahedra, faces with two equivalent Os(3)Ta9Os3 cuboctahedra, and faces with four equivalent Os(4)Ta9Os3 cuboctahedra. In the fourth Os site, Os(4) is bonded to one Ta(5), one Ta(6), one Ta(7), two equivalent Ta(1), two equivalent Ta(3), two equivalent Ta(4), one Os(2), one Os(4), and one Os(5) atom to form distorted OsTa9Os3 cuboctahedra that share corners with two equivalent Os(1)Ta6Os6 cuboctahedra, corners with two equivalent Os(2)Ta8Os4 cuboctahedra, corners with three equivalent Os(4)Ta9Os3 cuboctahedra, corners with four equivalent Os(3)Ta9Os3 cuboctahedra, edges with three equivalent Os(4)Ta9Os3 cuboctahedra,  a faceface with one Os(2)Ta8Os4 cuboctahedra, faces with two equivalent Os(4)Ta9Os3 cuboctahedra, and faces with four equivalent Os(3)Ta9Os3 cuboctahedra. In the fifth Os site, Os(5) is bonded in a distorted linear geometry to one Ta(1), two equivalent Ta(2), two equivalent Ta(6), one Os(1), two equivalent Os(3), and two equivalent Os(4) atoms. is represented by the CIF card [CIF]
data_Ta3Os2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.063
_cell_length_b   9.877
_cell_length_c   9.877
_cell_angle_alpha   90.035
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   493.900
_cell_formula_units_Z   6
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
  Ta  Ta0  1  0.503  0.103  0.897  1.0
  Ta  Ta1  1  0.503  0.897  0.103  1.0
  Ta  Ta2  1  0.995  0.399  0.399  1.0
  Ta  Ta3  1  0.995  0.601  0.601  1.0
  Ta  Ta4  1  0.501  0.370  0.962  1.0
  Ta  Ta5  1  0.501  0.630  0.038  1.0
  Ta  Ta6  1  0.003  0.130  0.465  1.0
  Ta  Ta7  1  0.003  0.870  0.535  1.0
  Ta  Ta8  1  0.501  0.962  0.370  1.0
  Ta  Ta9  1  0.501  0.038  0.630  1.0
  Ta  Ta10  1  0.003  0.465  0.130  1.0
  Ta  Ta11  1  0.003  0.535  0.870  1.0
  Ta  Ta12  1  0.750  0.181  0.181  1.0
  Ta  Ta13  1  0.750  0.819  0.819  1.0
  Ta  Ta14  1  0.750  0.681  0.319  1.0
  Ta  Ta15  1  0.750  0.319  0.681  1.0
  Ta  Ta16  1  0.250  0.818  0.818  1.0
  Ta  Ta17  1  0.250  0.182  0.182  1.0
  Os  Os18  1  0.479  0.500  0.500  1.0
  Os  Os19  1  0.002  0.000  0.000  1.0
  Os  Os20  1  0.500  0.435  0.243  1.0
  Os  Os21  1  0.500  0.565  0.757  1.0
  Os  Os22  1  0.001  0.070  0.741  1.0
  Os  Os23  1  0.001  0.930  0.259  1.0
  Os  Os24  1  0.500  0.243  0.435  1.0
  Os  Os25  1  0.500  0.757  0.565  1.0
  Os  Os26  1  0.001  0.741  0.070  1.0
  Os  Os27  1  0.001  0.259  0.930  1.0
  Os  Os28  1  0.250  0.319  0.681  1.0
  Os  Os29  1  0.250  0.681  0.319  1.0
[/CIF]
.