The crystal structure described by Ta2CoZn2O8 crystallizes in the triclinic P1 space group. There are eight inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(17), one O(2), one O(21), one O(31), one O(8), and one O(9) atom to form distorted TaO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Ta(7)O6 octahedra, and  an edgeedge with one Ta(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. In the second Ta site, Ta(2) is bonded to one O(1), one O(10), one O(18), one O(22), one O(32), and one O(7) atom to form distorted TaO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Ta(7)O6 octahedra, and  an edgeedge with one Ta(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. In the third Ta site, Ta(3) is bonded to one O(11), one O(19), one O(24), one O(29), one O(3), and one O(6) atom to form distorted TaO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Ta(5)O6 octahedra, and  an edgeedge with one Ta(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. In the fourth Ta site, Ta(4) is bonded to one O(12), one O(20), one O(23), one O(30), one O(4), and one O(5) atom to form distorted TaO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Ta(5)O6 octahedra, and  an edgeedge with one Ta(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. In the fifth Ta site, Ta(5) is bonded to one O(13), one O(19), one O(23), one O(27), one O(4), and one O(6) atom to form distorted TaO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Ta(3)O6 octahedra, and  an edgeedge with one Ta(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. In the sixth Ta site, Ta(6) is bonded to one O(14), one O(20), one O(24), one O(28), one O(3), and one O(5) atom to form distorted TaO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Ta(3)O6 octahedra, and  an edgeedge with one Ta(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. In the seventh Ta site, Ta(7) is bonded to one O(15), one O(18), one O(2), one O(21), one O(25), and one O(7) atom to form distorted TaO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Ta(1)O6 octahedra, and  an edgeedge with one Ta(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. In the eighth Ta site, Ta(8) is bonded to one O(1), one O(16), one O(17), one O(22), one O(26), and one O(8) atom to form distorted TaO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Ta(1)O6 octahedra, and  an edgeedge with one Ta(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(10), one O(12), one O(14), one O(15), one O(6), and one O(8) atom to form CoO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra,  a cornercorner with one Ta(6)O6 octahedra,  a cornercorner with one Ta(7)O6 octahedra,  a cornercorner with one Ta(8)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. In the second Co site, Co(2) is bonded to one O(1), one O(12), one O(13), one O(15), one O(3), and one O(9) atom to form CoO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra,  a cornercorner with one Ta(6)O6 octahedra,  a cornercorner with one Ta(7)O6 octahedra,  a cornercorner with one Ta(8)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. In the third Co site, Co(3) is bonded to one O(11), one O(13), one O(16), one O(5), one O(7), and one O(9) atom to form CoO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra,  a cornercorner with one Ta(6)O6 octahedra,  a cornercorner with one Ta(7)O6 octahedra,  a cornercorner with one Ta(8)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. In the fourth Co site, Co(4) is bonded to one O(10), one O(11), one O(14), one O(16), one O(2), and one O(4) atom to form CoO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra,  a cornercorner with one Ta(6)O6 octahedra,  a cornercorner with one Ta(7)O6 octahedra,  a cornercorner with one Ta(8)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. There are eight inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a distorted see-saw-like geometry to one O(23), one O(28), one O(29), and one O(31) atom. In the second Zn site, Zn(2) is bonded in a distorted see-saw-like geometry to one O(24), one O(27), one O(30), and one O(32) atom. In the third Zn site, Zn(3) is bonded in a distorted see-saw-like geometry to one O(22), one O(25), one O(30), and one O(31) atom. In the fourth Zn site, Zn(4) is bonded in a distorted see-saw-like geometry to one O(21), one O(26), one O(29), and one O(32) atom. In the fifth Zn site, Zn(5) is bonded in a distorted see-saw-like geometry to one O(17), one O(25), one O(27), and one O(32) atom. In the sixth Zn site, Zn(6) is bonded in a distorted see-saw-like geometry to one O(18), one O(26), one O(28), and one O(31) atom. In the seventh Zn site, Zn(7) is bonded in a distorted see-saw-like geometry to one O(20), one O(26), one O(27), and one O(29) atom. In the eighth Zn site, Zn(8) is bonded in a distorted see-saw-like geometry to one O(19), one O(25), one O(28), and one O(30) atom. There are thirty-two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Ta(2), one Ta(8), and one Co(2) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Ta(1), one Ta(7), and one Co(4) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Ta(3), one Ta(6), and one Co(2) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Ta(4), one Ta(5), and one Co(4) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Ta(4), one Ta(6), and one Co(3) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Ta(3), one Ta(5), and one Co(1) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Ta(2), one Ta(7), and one Co(3) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Ta(1), one Ta(8), and one Co(1) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Ta(1), one Co(2), and one Co(3) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Ta(2), one Co(1), and one Co(4) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Ta(3), one Co(3), and one Co(4) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Ta(4), one Co(1), and one Co(2) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Ta(5), one Co(2), and one Co(3) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one Ta(6), one Co(1), and one Co(4) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Ta(7), one Co(1), and one Co(2) atom. In the sixteenth O site, O(16) is bonded in a distorted trigonal planar geometry to one Ta(8), one Co(3), and one Co(4) atom. In the seventeenth O site, O(17) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(8), and one Zn(5) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one Ta(2), one Ta(7), and one Zn(6) atom. In the nineteenth O site, O(19) is bonded in a distorted trigonal planar geometry to one Ta(3), one Ta(5), and one Zn(8) atom. In the twentieth O site, O(20) is bonded in a distorted trigonal planar geometry to one Ta(4), one Ta(6), and one Zn(7) atom. In the twenty-first O site, O(21) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(7), and one Zn(4) atom. In the twenty-second O site, O(22) is bonded in a distorted trigonal planar geometry to one Ta(2), one Ta(8), and one Zn(3) atom. In the twenty-third O site, O(23) is bonded in a 3-coordinate geometry to one Ta(4), one Ta(5), and one Zn(1) atom. In the twenty-fourth O site, O(24) is bonded in a distorted trigonal planar geometry to one Ta(3), one Ta(6), and one Zn(2) atom. In the twenty-fifth O site, O(25) is bonded to one Ta(7), one Zn(3), one Zn(5), and one Zn(8) atom to form a mixture of corner and edge-sharing OTaZn3 trigonal pyramids. In the twenty-sixth O site, O(26) is bonded to one Ta(8), one Zn(4), one Zn(6), and one Zn(7) atom to form a mixture of corner and edge-sharing OTaZn3 trigonal pyramids. In the twenty-seventh O site, O(27) is bonded to one Ta(5), one Zn(2), one Zn(5), and one Zn(7) atom to form a mixture of corner and edge-sharing OTaZn3 trigonal pyramids. In the twenty-eighth O site, O(28) is bonded to one Ta(6), one Zn(1), one Zn(6), and one Zn(8) atom to form a mixture of corner and edge-sharing OTaZn3 trigonal pyramids. In the twenty-ninth O site, O(29) is bonded to one Ta(3), one Zn(1), one Zn(4), and one Zn(7) atom to form a mixture of corner and edge-sharing OTaZn3 trigonal pyramids. In the thirtieth O site, O(30) is bonded to one Ta(4), one Zn(2), one Zn(3), and one Zn(8) atom to form a mixture of corner and edge-sharing OTaZn3 trigonal pyramids. In the thirty-first O site, O(31) is bonded to one Ta(1), one Zn(1), one Zn(3), and one Zn(6) atom to form a mixture of corner and edge-sharing OTaZn3 trigonal pyramids. In the thirty-second O site, O(32) is bonded to one Ta(2), one Zn(2), one Zn(4), and one Zn(5) atom to form a mixture of corner and edge-sharing OTaZn3 trigonal pyramids. is represented by the CIF card [CIF]
data_Ta2Zn2CoO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.286
_cell_length_b   5.934
_cell_length_c   10.102
_cell_angle_alpha   72.947
_cell_angle_beta   89.809
_cell_angle_gamma   89.923
_symmetry_Int_Tables_number   1
_cell_volume   302.955
_cell_formula_units_Z   2
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
  Co  Co0  1  0.250  0.640  0.000  1.0
  Co  Co1  1  0.752  0.358  0.001  1.0
  O  O2  1  0.931  0.183  0.863  1.0
  O  O3  1  0.571  0.046  0.138  1.0
  O  O4  1  0.072  0.815  0.138  1.0
  O  O5  1  0.431  0.952  0.863  1.0
  O  O6  1  0.413  0.431  0.885  1.0
  O  O7  1  0.088  0.317  0.117  1.0
  O  O8  1  0.589  0.567  0.116  1.0
  O  O9  1  0.913  0.681  0.884  1.0
  O  O10  1  0.570  0.278  0.647  1.0
  O  O11  1  0.933  0.925  0.354  1.0
  O  O12  1  0.070  0.073  0.647  1.0
  O  O13  1  0.433  0.720  0.355  1.0
  O  O14  1  0.642  0.841  0.614  1.0
  O  O15  1  0.860  0.455  0.387  1.0
  O  O16  1  0.360  0.157  0.387  1.0
  O  O17  1  0.142  0.543  0.614  1.0
  Ta  Ta18  1  0.268  0.270  0.772  1.0
  Ta  Ta19  1  0.234  0.043  0.228  1.0
  Ta  Ta20  1  0.734  0.729  0.229  1.0
  Ta  Ta21  1  0.768  0.956  0.773  1.0
  Zn  Zn22  1  0.231  0.436  0.436  1.0
  Zn  Zn23  1  0.272  0.871  0.564  1.0
  Zn  Zn24  1  0.771  0.563  0.565  1.0
  Zn  Zn25  1  0.731  0.128  0.437  1.0
[/CIF]
.
The crystal structure described by Ta2CoZn2O8 crystallizes in the triclinic P1 space group. There are eight inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(17), one O(2), one O(21), one O(31), one O(8), and one O(9) atom to form distorted TaO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Ta(7)O6 octahedra, and  an edgeedge with one Ta(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. In the second Ta site, Ta(2) is bonded to one O(1), one O(10), one O(18), one O(22), one O(32), and one O(7) atom to form distorted TaO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Ta(7)O6 octahedra, and  an edgeedge with one Ta(8)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. In the third Ta site, Ta(3) is bonded to one O(11), one O(19), one O(24), one O(29), one O(3), and one O(6) atom to form distorted TaO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Ta(5)O6 octahedra, and  an edgeedge with one Ta(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. In the fourth Ta site, Ta(4) is bonded to one O(12), one O(20), one O(23), one O(30), one O(4), and one O(5) atom to form distorted TaO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Ta(5)O6 octahedra, and  an edgeedge with one Ta(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. In the fifth Ta site, Ta(5) is bonded to one O(13), one O(19), one O(23), one O(27), one O(4), and one O(6) atom to form distorted TaO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Ta(3)O6 octahedra, and  an edgeedge with one Ta(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. In the sixth Ta site, Ta(6) is bonded to one O(14), one O(20), one O(24), one O(28), one O(3), and one O(5) atom to form distorted TaO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Ta(3)O6 octahedra, and  an edgeedge with one Ta(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. In the seventh Ta site, Ta(7) is bonded to one O(15), one O(18), one O(2), one O(21), one O(25), and one O(7) atom to form distorted TaO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Ta(1)O6 octahedra, and  an edgeedge with one Ta(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. In the eighth Ta site, Ta(8) is bonded to one O(1), one O(16), one O(17), one O(22), one O(26), and one O(8) atom to form distorted TaO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra,  an edgeedge with one Ta(1)O6 octahedra, and  an edgeedge with one Ta(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(10), one O(12), one O(14), one O(15), one O(6), and one O(8) atom to form CoO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra,  a cornercorner with one Ta(6)O6 octahedra,  a cornercorner with one Ta(7)O6 octahedra,  a cornercorner with one Ta(8)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. In the second Co site, Co(2) is bonded to one O(1), one O(12), one O(13), one O(15), one O(3), and one O(9) atom to form CoO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra,  a cornercorner with one Ta(6)O6 octahedra,  a cornercorner with one Ta(7)O6 octahedra,  a cornercorner with one Ta(8)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. In the third Co site, Co(3) is bonded to one O(11), one O(13), one O(16), one O(5), one O(7), and one O(9) atom to form CoO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra,  a cornercorner with one Ta(6)O6 octahedra,  a cornercorner with one Ta(7)O6 octahedra,  a cornercorner with one Ta(8)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. In the fourth Co site, Co(4) is bonded to one O(10), one O(11), one O(14), one O(16), one O(2), and one O(4) atom to form CoO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra,  a cornercorner with one Ta(6)O6 octahedra,  a cornercorner with one Ta(7)O6 octahedra,  a cornercorner with one Ta(8)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-55°. There are eight inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a distorted see-saw-like geometry to one O(23), one O(28), one O(29), and one O(31) atom. In the second Zn site, Zn(2) is bonded in a distorted see-saw-like geometry to one O(24), one O(27), one O(30), and one O(32) atom. In the third Zn site, Zn(3) is bonded in a distorted see-saw-like geometry to one O(22), one O(25), one O(30), and one O(31) atom. In the fourth Zn site, Zn(4) is bonded in a distorted see-saw-like geometry to one O(21), one O(26), one O(29), and one O(32) atom. In the fifth Zn site, Zn(5) is bonded in a distorted see-saw-like geometry to one O(17), one O(25), one O(27), and one O(32) atom. In the sixth Zn site, Zn(6) is bonded in a distorted see-saw-like geometry to one O(18), one O(26), one O(28), and one O(31) atom. In the seventh Zn site, Zn(7) is bonded in a distorted see-saw-like geometry to one O(20), one O(26), one O(27), and one O(29) atom. In the eighth Zn site, Zn(8) is bonded in a distorted see-saw-like geometry to one O(19), one O(25), one O(28), and one O(30) atom. There are thirty-two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Ta(2), one Ta(8), and one Co(2) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Ta(1), one Ta(7), and one Co(4) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Ta(3), one Ta(6), and one Co(2) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Ta(4), one Ta(5), and one Co(4) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Ta(4), one Ta(6), and one Co(3) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Ta(3), one Ta(5), and one Co(1) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Ta(2), one Ta(7), and one Co(3) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Ta(1), one Ta(8), and one Co(1) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Ta(1), one Co(2), and one Co(3) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Ta(2), one Co(1), and one Co(4) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Ta(3), one Co(3), and one Co(4) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Ta(4), one Co(1), and one Co(2) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Ta(5), one Co(2), and one Co(3) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one Ta(6), one Co(1), and one Co(4) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Ta(7), one Co(1), and one Co(2) atom. In the sixteenth O site, O(16) is bonded in a distorted trigonal planar geometry to one Ta(8), one Co(3), and one Co(4) atom. In the seventeenth O site, O(17) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(8), and one Zn(5) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one Ta(2), one Ta(7), and one Zn(6) atom. In the nineteenth O site, O(19) is bonded in a distorted trigonal planar geometry to one Ta(3), one Ta(5), and one Zn(8) atom. In the twentieth O site, O(20) is bonded in a distorted trigonal planar geometry to one Ta(4), one Ta(6), and one Zn(7) atom. In the twenty-first O site, O(21) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(7), and one Zn(4) atom. In the twenty-second O site, O(22) is bonded in a distorted trigonal planar geometry to one Ta(2), one Ta(8), and one Zn(3) atom. In the twenty-third O site, O(23) is bonded in a 3-coordinate geometry to one Ta(4), one Ta(5), and one Zn(1) atom. In the twenty-fourth O site, O(24) is bonded in a distorted trigonal planar geometry to one Ta(3), one Ta(6), and one Zn(2) atom. In the twenty-fifth O site, O(25) is bonded to one Ta(7), one Zn(3), one Zn(5), and one Zn(8) atom to form a mixture of corner and edge-sharing OTaZn3 trigonal pyramids. In the twenty-sixth O site, O(26) is bonded to one Ta(8), one Zn(4), one Zn(6), and one Zn(7) atom to form a mixture of corner and edge-sharing OTaZn3 trigonal pyramids. In the twenty-seventh O site, O(27) is bonded to one Ta(5), one Zn(2), one Zn(5), and one Zn(7) atom to form a mixture of corner and edge-sharing OTaZn3 trigonal pyramids. In the twenty-eighth O site, O(28) is bonded to one Ta(6), one Zn(1), one Zn(6), and one Zn(8) atom to form a mixture of corner and edge-sharing OTaZn3 trigonal pyramids. In the twenty-ninth O site, O(29) is bonded to one Ta(3), one Zn(1), one Zn(4), and one Zn(7) atom to form a mixture of corner and edge-sharing OTaZn3 trigonal pyramids. In the thirtieth O site, O(30) is bonded to one Ta(4), one Zn(2), one Zn(3), and one Zn(8) atom to form a mixture of corner and edge-sharing OTaZn3 trigonal pyramids. In the thirty-first O site, O(31) is bonded to one Ta(1), one Zn(1), one Zn(3), and one Zn(6) atom to form a mixture of corner and edge-sharing OTaZn3 trigonal pyramids. In the thirty-second O site, O(32) is bonded to one Ta(2), one Zn(2), one Zn(4), and one Zn(5) atom to form a mixture of corner and edge-sharing OTaZn3 trigonal pyramids. is represented by the CIF card [CIF]
data_Ta2Zn2CoO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.286
_cell_length_b   5.934
_cell_length_c   10.102
_cell_angle_alpha   72.947
_cell_angle_beta   89.809
_cell_angle_gamma   89.923
_symmetry_Int_Tables_number   1
_cell_volume   302.955
_cell_formula_units_Z   2
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
  Co  Co0  1  0.250  0.640  0.000  1.0
  Co  Co1  1  0.752  0.358  0.001  1.0
  O  O2  1  0.931  0.183  0.863  1.0
  O  O3  1  0.571  0.046  0.138  1.0
  O  O4  1  0.072  0.815  0.138  1.0
  O  O5  1  0.431  0.952  0.863  1.0
  O  O6  1  0.413  0.431  0.885  1.0
  O  O7  1  0.088  0.317  0.117  1.0
  O  O8  1  0.589  0.567  0.116  1.0
  O  O9  1  0.913  0.681  0.884  1.0
  O  O10  1  0.570  0.278  0.647  1.0
  O  O11  1  0.933  0.925  0.354  1.0
  O  O12  1  0.070  0.073  0.647  1.0
  O  O13  1  0.433  0.720  0.355  1.0
  O  O14  1  0.642  0.841  0.614  1.0
  O  O15  1  0.860  0.455  0.387  1.0
  O  O16  1  0.360  0.157  0.387  1.0
  O  O17  1  0.142  0.543  0.614  1.0
  Ta  Ta18  1  0.268  0.270  0.772  1.0
  Ta  Ta19  1  0.234  0.043  0.228  1.0
  Ta  Ta20  1  0.734  0.729  0.229  1.0
  Ta  Ta21  1  0.768  0.956  0.773  1.0
  Zn  Zn22  1  0.231  0.436  0.436  1.0
  Zn  Zn23  1  0.272  0.871  0.564  1.0
  Zn  Zn24  1  0.771  0.563  0.565  1.0
  Zn  Zn25  1  0.731  0.128  0.437  1.0
[/CIF]
.