The crystal structure described by CaHf8(N2O)4 crystallizes in the triclinic P1 space group. Ca(1) is bonded to one N(3), one N(5), one N(7), one N(8), one O(3), and one O(4) atom to form CaN4O2 octahedra that share corners with three equivalent Hf(5)N4O2 octahedra, corners with three equivalent Hf(7)N4O2 octahedra, edges with three equivalent Hf(8)N4O2 octahedra,  a faceface with one Hf(3)N4O2 octahedra, and  a faceface with one Hf(4)N4O2 octahedra. The corner-sharing octahedral tilt angles range from 41-50°. There are eight inequivalent Hf sites. In the first Hf site, Hf(1) is bonded to one N(1), one N(2), one N(4), one N(6), one O(1), and one O(2) atom to form a mixture of distorted face and corner-sharing HfN4O2 octahedra. The corner-sharing octahedral tilt angles range from 43-63°. In the second Hf site, Hf(2) is bonded in a 6-coordinate geometry to one N(3), one N(5), one N(7), one N(8), one O(3), and one O(4) atom. In the third Hf site, Hf(3) is bonded to one N(2), one N(5), one N(6), one N(8), one O(1), and one O(3) atom to form distorted HfN4O2 octahedra that share corners with three equivalent Hf(8)N4O2 octahedra, edges with three equivalent Hf(7)N4O2 octahedra,  a faceface with one Ca(1)N4O2 octahedra, and  a faceface with one Hf(1)N4O2 octahedra. The corner-sharing octahedral tilt angles range from 40-47°. In the fourth Hf site, Hf(4) is bonded to one N(1), one N(3), one N(4), one N(7), one O(2), and one O(4) atom to form distorted HfN4O2 octahedra that share corners with three equivalent Hf(1)N4O2 octahedra, corners with three equivalent Hf(8)N4O2 octahedra, edges with three equivalent Hf(5)N4O2 octahedra, and  a faceface with one Ca(1)N4O2 octahedra. The corner-sharing octahedral tilt angles range from 49-65°. In the fifth Hf site, Hf(5) is bonded to one N(1), one N(3), one N(4), one N(7), one O(2), and one O(4) atom to form distorted HfN4O2 octahedra that share corners with three equivalent Ca(1)N4O2 octahedra, corners with three equivalent Hf(1)N4O2 octahedra, corners with three equivalent Hf(8)N4O2 octahedra, and edges with three equivalent Hf(4)N4O2 octahedra. The corner-sharing octahedral tilt angles range from 41-63°. In the sixth Hf site, Hf(6) is bonded in a 6-coordinate geometry to one N(1), one N(2), one N(4), one N(6), one O(1), and one O(2) atom. In the seventh Hf site, Hf(7) is bonded to one N(2), one N(5), one N(6), one N(8), one O(1), and one O(3) atom to form distorted HfN4O2 octahedra that share corners with three equivalent Ca(1)N4O2 octahedra, corners with three equivalent Hf(1)N4O2 octahedra, edges with three equivalent Hf(3)N4O2 octahedra, and  a faceface with one Hf(8)N4O2 octahedra. The corner-sharing octahedral tilt angles range from 42-48°. In the eighth Hf site, Hf(8) is bonded to one N(3), one N(5), one N(7), one N(8), one O(3), and one O(4) atom to form distorted HfN4O2 octahedra that share corners with three equivalent Hf(3)N4O2 octahedra, corners with three equivalent Hf(4)N4O2 octahedra, corners with three equivalent Hf(5)N4O2 octahedra, edges with three equivalent Ca(1)N4O2 octahedra, and  a faceface with one Hf(7)N4O2 octahedra. The corner-sharing octahedral tilt angles range from 40-65°. There are eight inequivalent N sites. In the first N site, N(1) is bonded in a distorted see-saw-like geometry to one Hf(1), one Hf(4), one Hf(5), and one Hf(6) atom. In the second N site, N(2) is bonded in a rectangular see-saw-like geometry to one Hf(1), one Hf(3), one Hf(6), and one Hf(7) atom. In the third N site, N(3) is bonded to one Ca(1), one Hf(2), one Hf(4), one Hf(5), and one Hf(8) atom to form distorted NCaHf4 trigonal bipyramids that share  a cornercorner with one N(5)CaHf4 trigonal bipyramid,  a cornercorner with one N(7)CaHf4 trigonal bipyramid,  a cornercorner with one N(8)CaHf4 trigonal bipyramid,  a cornercorner with one O(3)CaHf4 trigonal bipyramid,  a cornercorner with one O(4)CaHf4 trigonal bipyramid,  an edgeedge with one N(5)CaHf4 trigonal bipyramid,  an edgeedge with one N(8)CaHf4 trigonal bipyramid,  an edgeedge with one O(3)CaHf4 trigonal bipyramid, edges with two equivalent N(7)CaHf4 trigonal bipyramids, edges with two equivalent O(4)CaHf4 trigonal bipyramids, and  an edgeedge with one N(4)Hf4 trigonal pyramid. In the fourth N site, N(4) is bonded to one Hf(1), one Hf(4), one Hf(5), and one Hf(6) atom to form distorted NHf4 trigonal pyramids that share corners with two equivalent N(7)CaHf4 trigonal bipyramids, corners with two equivalent O(4)CaHf4 trigonal bipyramids, corners with two equivalent N(6)Hf4 trigonal pyramids,  an edgeedge with one N(3)CaHf4 trigonal bipyramid, and  an edgeedge with one O(1)Hf4 trigonal pyramid. In the fifth N site, N(5) is bonded to one Ca(1), one Hf(2), one Hf(3), one Hf(7), and one Hf(8) atom to form distorted NCaHf4 trigonal bipyramids that share  a cornercorner with one N(3)CaHf4 trigonal bipyramid,  a cornercorner with one N(7)CaHf4 trigonal bipyramid,  a cornercorner with one N(8)CaHf4 trigonal bipyramid,  a cornercorner with one O(3)CaHf4 trigonal bipyramid,  a cornercorner with one O(4)CaHf4 trigonal bipyramid, corners with two equivalent N(6)Hf4 trigonal pyramids, corners with two equivalent O(1)Hf4 trigonal pyramids,  an edgeedge with one N(3)CaHf4 trigonal bipyramid,  an edgeedge with one N(7)CaHf4 trigonal bipyramid,  an edgeedge with one O(4)CaHf4 trigonal bipyramid, edges with two equivalent N(8)CaHf4 trigonal bipyramids, and edges with two equivalent O(3)CaHf4 trigonal bipyramids. In the sixth N site, N(6) is bonded to one Hf(1), one Hf(3), one Hf(6), and one Hf(7) atom to form distorted NHf4 trigonal pyramids that share corners with two equivalent N(5)CaHf4 trigonal bipyramids, corners with two equivalent N(8)CaHf4 trigonal bipyramids, corners with two equivalent N(4)Hf4 trigonal pyramids, corners with two equivalent O(1)Hf4 trigonal pyramids,  an edgeedge with one O(3)CaHf4 trigonal bipyramid, and  an edgeedge with one O(1)Hf4 trigonal pyramid. In the seventh N site, N(7) is bonded to one Ca(1), one Hf(2), one Hf(4), one Hf(5), and one Hf(8) atom to form distorted NCaHf4 trigonal bipyramids that share  a cornercorner with one N(3)CaHf4 trigonal bipyramid,  a cornercorner with one N(5)CaHf4 trigonal bipyramid,  a cornercorner with one N(8)CaHf4 trigonal bipyramid,  a cornercorner with one O(3)CaHf4 trigonal bipyramid,  a cornercorner with one O(4)CaHf4 trigonal bipyramid, corners with two equivalent N(4)Hf4 trigonal pyramids,  an edgeedge with one N(5)CaHf4 trigonal bipyramid,  an edgeedge with one N(8)CaHf4 trigonal bipyramid,  an edgeedge with one O(3)CaHf4 trigonal bipyramid, edges with two equivalent N(3)CaHf4 trigonal bipyramids, and edges with two equivalent O(4)CaHf4 trigonal bipyramids. In the eighth N site, N(8) is bonded to one Ca(1), one Hf(2), one Hf(3), one Hf(7), and one Hf(8) atom to form distorted NCaHf4 trigonal bipyramids that share  a cornercorner with one N(3)CaHf4 trigonal bipyramid,  a cornercorner with one N(5)CaHf4 trigonal bipyramid,  a cornercorner with one N(7)CaHf4 trigonal bipyramid,  a cornercorner with one O(3)CaHf4 trigonal bipyramid,  a cornercorner with one O(4)CaHf4 trigonal bipyramid, corners with two equivalent N(6)Hf4 trigonal pyramids,  an edgeedge with one N(3)CaHf4 trigonal bipyramid,  an edgeedge with one N(7)CaHf4 trigonal bipyramid,  an edgeedge with one O(4)CaHf4 trigonal bipyramid, edges with two equivalent N(5)CaHf4 trigonal bipyramids, edges with two equivalent O(3)CaHf4 trigonal bipyramids, and  an edgeedge with one O(1)Hf4 trigonal pyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Hf(1), one Hf(3), one Hf(6), and one Hf(7) atom to form distorted OHf4 trigonal pyramids that share corners with two equivalent N(5)CaHf4 trigonal bipyramids, corners with two equivalent O(3)CaHf4 trigonal bipyramids, corners with two equivalent N(6)Hf4 trigonal pyramids,  an edgeedge with one N(8)CaHf4 trigonal bipyramid,  an edgeedge with one N(4)Hf4 trigonal pyramid, and  an edgeedge with one N(6)Hf4 trigonal pyramid. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Hf(1), one Hf(4), one Hf(5), and one Hf(6) atom. In the third O site, O(3) is bonded to one Ca(1), one Hf(2), one Hf(3), one Hf(7), and one Hf(8) atom to form distorted OCaHf4 trigonal bipyramids that share  a cornercorner with one N(3)CaHf4 trigonal bipyramid,  a cornercorner with one N(5)CaHf4 trigonal bipyramid,  a cornercorner with one N(7)CaHf4 trigonal bipyramid,  a cornercorner with one N(8)CaHf4 trigonal bipyramid,  a cornercorner with one O(4)CaHf4 trigonal bipyramid, corners with two equivalent O(1)Hf4 trigonal pyramids,  an edgeedge with one N(3)CaHf4 trigonal bipyramid,  an edgeedge with one N(7)CaHf4 trigonal bipyramid,  an edgeedge with one O(4)CaHf4 trigonal bipyramid, edges with two equivalent N(5)CaHf4 trigonal bipyramids, edges with two equivalent N(8)CaHf4 trigonal bipyramids, and  an edgeedge with one N(6)Hf4 trigonal pyramid. In the fourth O site, O(4) is bonded to one Ca(1), one Hf(2), one Hf(4), one Hf(5), and one Hf(8) atom to form distorted OCaHf4 trigonal bipyramids that share  a cornercorner with one N(3)CaHf4 trigonal bipyramid,  a cornercorner with one N(5)CaHf4 trigonal bipyramid,  a cornercorner with one N(7)CaHf4 trigonal bipyramid,  a cornercorner with one N(8)CaHf4 trigonal bipyramid,  a cornercorner with one O(3)CaHf4 trigonal bipyramid, corners with two equivalent N(4)Hf4 trigonal pyramids,  an edgeedge with one N(5)CaHf4 trigonal bipyramid,  an edgeedge with one N(8)CaHf4 trigonal bipyramid,  an edgeedge with one O(3)CaHf4 trigonal bipyramid, edges with two equivalent N(3)CaHf4 trigonal bipyramids, and edges with two equivalent N(7)CaHf4 trigonal bipyramids. is represented by the CIF file [CIF]
data_CaHf8(N2O)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.528
_cell_length_b   5.516
_cell_length_c   10.829
_cell_angle_alpha   90.494
_cell_angle_beta   74.370
_cell_angle_gamma   59.697
_symmetry_Int_Tables_number   1
_cell_volume   270.353
_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
  Ca  Ca0  1  0.496  0.223  0.751  1.0
  Hf  Hf1  1  0.138  0.436  0.292  1.0
  Hf  Hf2  1  0.128  0.899  0.789  1.0
  Hf  Hf3  1  0.344  0.354  0.010  1.0
  Hf  Hf4  1  0.659  0.194  0.492  1.0
  Hf  Hf5  1  0.349  0.842  0.474  1.0
  Hf  Hf6  1  0.842  0.086  0.210  1.0
  Hf  Hf7  1  0.660  0.681  0.028  1.0
  Hf  Hf8  1  0.853  0.550  0.713  1.0
  N  N9  1  0.456  0.117  0.369  1.0
  N  N10  1  0.551  0.390  0.131  1.0
  N  N11  1  0.254  0.559  0.630  1.0
  N  N12  1  0.749  0.436  0.370  1.0
  N  N13  1  0.449  0.610  0.874  1.0
  N  N14  1  0.931  0.684  0.132  1.0
  N  N15  1  0.950  0.164  0.624  1.0
  N  N16  1  0.741  0.922  0.881  1.0
  O  O17  1  0.257  0.068  0.132  1.0
  O  O18  1  0.072  0.817  0.376  1.0
  O  O19  1  0.051  0.303  0.875  1.0
  O  O20  1  0.578  0.850  0.617  1.0
[/CIF]
.
The crystal structure described by CaHf8(N2O)4 crystallizes in the triclinic P1 space group. Ca(1) is bonded to one N(3), one N(5), one N(7), one N(8), one O(3), and one O(4) atom to form CaN4O2 octahedra that share corners with three equivalent Hf(5)N4O2 octahedra, corners with three equivalent Hf(7)N4O2 octahedra, edges with three equivalent Hf(8)N4O2 octahedra,  a faceface with one Hf(3)N4O2 octahedra, and  a faceface with one Hf(4)N4O2 octahedra. The corner-sharing octahedral tilt angles range from 41-50°. There are eight inequivalent Hf sites. In the first Hf site, Hf(1) is bonded to one N(1), one N(2), one N(4), one N(6), one O(1), and one O(2) atom to form a mixture of distorted face and corner-sharing HfN4O2 octahedra. The corner-sharing octahedral tilt angles range from 43-63°. In the second Hf site, Hf(2) is bonded in a 6-coordinate geometry to one N(3), one N(5), one N(7), one N(8), one O(3), and one O(4) atom. In the third Hf site, Hf(3) is bonded to one N(2), one N(5), one N(6), one N(8), one O(1), and one O(3) atom to form distorted HfN4O2 octahedra that share corners with three equivalent Hf(8)N4O2 octahedra, edges with three equivalent Hf(7)N4O2 octahedra,  a faceface with one Ca(1)N4O2 octahedra, and  a faceface with one Hf(1)N4O2 octahedra. The corner-sharing octahedral tilt angles range from 40-47°. In the fourth Hf site, Hf(4) is bonded to one N(1), one N(3), one N(4), one N(7), one O(2), and one O(4) atom to form distorted HfN4O2 octahedra that share corners with three equivalent Hf(1)N4O2 octahedra, corners with three equivalent Hf(8)N4O2 octahedra, edges with three equivalent Hf(5)N4O2 octahedra, and  a faceface with one Ca(1)N4O2 octahedra. The corner-sharing octahedral tilt angles range from 49-65°. In the fifth Hf site, Hf(5) is bonded to one N(1), one N(3), one N(4), one N(7), one O(2), and one O(4) atom to form distorted HfN4O2 octahedra that share corners with three equivalent Ca(1)N4O2 octahedra, corners with three equivalent Hf(1)N4O2 octahedra, corners with three equivalent Hf(8)N4O2 octahedra, and edges with three equivalent Hf(4)N4O2 octahedra. The corner-sharing octahedral tilt angles range from 41-63°. In the sixth Hf site, Hf(6) is bonded in a 6-coordinate geometry to one N(1), one N(2), one N(4), one N(6), one O(1), and one O(2) atom. In the seventh Hf site, Hf(7) is bonded to one N(2), one N(5), one N(6), one N(8), one O(1), and one O(3) atom to form distorted HfN4O2 octahedra that share corners with three equivalent Ca(1)N4O2 octahedra, corners with three equivalent Hf(1)N4O2 octahedra, edges with three equivalent Hf(3)N4O2 octahedra, and  a faceface with one Hf(8)N4O2 octahedra. The corner-sharing octahedral tilt angles range from 42-48°. In the eighth Hf site, Hf(8) is bonded to one N(3), one N(5), one N(7), one N(8), one O(3), and one O(4) atom to form distorted HfN4O2 octahedra that share corners with three equivalent Hf(3)N4O2 octahedra, corners with three equivalent Hf(4)N4O2 octahedra, corners with three equivalent Hf(5)N4O2 octahedra, edges with three equivalent Ca(1)N4O2 octahedra, and  a faceface with one Hf(7)N4O2 octahedra. The corner-sharing octahedral tilt angles range from 40-65°. There are eight inequivalent N sites. In the first N site, N(1) is bonded in a distorted see-saw-like geometry to one Hf(1), one Hf(4), one Hf(5), and one Hf(6) atom. In the second N site, N(2) is bonded in a rectangular see-saw-like geometry to one Hf(1), one Hf(3), one Hf(6), and one Hf(7) atom. In the third N site, N(3) is bonded to one Ca(1), one Hf(2), one Hf(4), one Hf(5), and one Hf(8) atom to form distorted NCaHf4 trigonal bipyramids that share  a cornercorner with one N(5)CaHf4 trigonal bipyramid,  a cornercorner with one N(7)CaHf4 trigonal bipyramid,  a cornercorner with one N(8)CaHf4 trigonal bipyramid,  a cornercorner with one O(3)CaHf4 trigonal bipyramid,  a cornercorner with one O(4)CaHf4 trigonal bipyramid,  an edgeedge with one N(5)CaHf4 trigonal bipyramid,  an edgeedge with one N(8)CaHf4 trigonal bipyramid,  an edgeedge with one O(3)CaHf4 trigonal bipyramid, edges with two equivalent N(7)CaHf4 trigonal bipyramids, edges with two equivalent O(4)CaHf4 trigonal bipyramids, and  an edgeedge with one N(4)Hf4 trigonal pyramid. In the fourth N site, N(4) is bonded to one Hf(1), one Hf(4), one Hf(5), and one Hf(6) atom to form distorted NHf4 trigonal pyramids that share corners with two equivalent N(7)CaHf4 trigonal bipyramids, corners with two equivalent O(4)CaHf4 trigonal bipyramids, corners with two equivalent N(6)Hf4 trigonal pyramids,  an edgeedge with one N(3)CaHf4 trigonal bipyramid, and  an edgeedge with one O(1)Hf4 trigonal pyramid. In the fifth N site, N(5) is bonded to one Ca(1), one Hf(2), one Hf(3), one Hf(7), and one Hf(8) atom to form distorted NCaHf4 trigonal bipyramids that share  a cornercorner with one N(3)CaHf4 trigonal bipyramid,  a cornercorner with one N(7)CaHf4 trigonal bipyramid,  a cornercorner with one N(8)CaHf4 trigonal bipyramid,  a cornercorner with one O(3)CaHf4 trigonal bipyramid,  a cornercorner with one O(4)CaHf4 trigonal bipyramid, corners with two equivalent N(6)Hf4 trigonal pyramids, corners with two equivalent O(1)Hf4 trigonal pyramids,  an edgeedge with one N(3)CaHf4 trigonal bipyramid,  an edgeedge with one N(7)CaHf4 trigonal bipyramid,  an edgeedge with one O(4)CaHf4 trigonal bipyramid, edges with two equivalent N(8)CaHf4 trigonal bipyramids, and edges with two equivalent O(3)CaHf4 trigonal bipyramids. In the sixth N site, N(6) is bonded to one Hf(1), one Hf(3), one Hf(6), and one Hf(7) atom to form distorted NHf4 trigonal pyramids that share corners with two equivalent N(5)CaHf4 trigonal bipyramids, corners with two equivalent N(8)CaHf4 trigonal bipyramids, corners with two equivalent N(4)Hf4 trigonal pyramids, corners with two equivalent O(1)Hf4 trigonal pyramids,  an edgeedge with one O(3)CaHf4 trigonal bipyramid, and  an edgeedge with one O(1)Hf4 trigonal pyramid. In the seventh N site, N(7) is bonded to one Ca(1), one Hf(2), one Hf(4), one Hf(5), and one Hf(8) atom to form distorted NCaHf4 trigonal bipyramids that share  a cornercorner with one N(3)CaHf4 trigonal bipyramid,  a cornercorner with one N(5)CaHf4 trigonal bipyramid,  a cornercorner with one N(8)CaHf4 trigonal bipyramid,  a cornercorner with one O(3)CaHf4 trigonal bipyramid,  a cornercorner with one O(4)CaHf4 trigonal bipyramid, corners with two equivalent N(4)Hf4 trigonal pyramids,  an edgeedge with one N(5)CaHf4 trigonal bipyramid,  an edgeedge with one N(8)CaHf4 trigonal bipyramid,  an edgeedge with one O(3)CaHf4 trigonal bipyramid, edges with two equivalent N(3)CaHf4 trigonal bipyramids, and edges with two equivalent O(4)CaHf4 trigonal bipyramids. In the eighth N site, N(8) is bonded to one Ca(1), one Hf(2), one Hf(3), one Hf(7), and one Hf(8) atom to form distorted NCaHf4 trigonal bipyramids that share  a cornercorner with one N(3)CaHf4 trigonal bipyramid,  a cornercorner with one N(5)CaHf4 trigonal bipyramid,  a cornercorner with one N(7)CaHf4 trigonal bipyramid,  a cornercorner with one O(3)CaHf4 trigonal bipyramid,  a cornercorner with one O(4)CaHf4 trigonal bipyramid, corners with two equivalent N(6)Hf4 trigonal pyramids,  an edgeedge with one N(3)CaHf4 trigonal bipyramid,  an edgeedge with one N(7)CaHf4 trigonal bipyramid,  an edgeedge with one O(4)CaHf4 trigonal bipyramid, edges with two equivalent N(5)CaHf4 trigonal bipyramids, edges with two equivalent O(3)CaHf4 trigonal bipyramids, and  an edgeedge with one O(1)Hf4 trigonal pyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Hf(1), one Hf(3), one Hf(6), and one Hf(7) atom to form distorted OHf4 trigonal pyramids that share corners with two equivalent N(5)CaHf4 trigonal bipyramids, corners with two equivalent O(3)CaHf4 trigonal bipyramids, corners with two equivalent N(6)Hf4 trigonal pyramids,  an edgeedge with one N(8)CaHf4 trigonal bipyramid,  an edgeedge with one N(4)Hf4 trigonal pyramid, and  an edgeedge with one N(6)Hf4 trigonal pyramid. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Hf(1), one Hf(4), one Hf(5), and one Hf(6) atom. In the third O site, O(3) is bonded to one Ca(1), one Hf(2), one Hf(3), one Hf(7), and one Hf(8) atom to form distorted OCaHf4 trigonal bipyramids that share  a cornercorner with one N(3)CaHf4 trigonal bipyramid,  a cornercorner with one N(5)CaHf4 trigonal bipyramid,  a cornercorner with one N(7)CaHf4 trigonal bipyramid,  a cornercorner with one N(8)CaHf4 trigonal bipyramid,  a cornercorner with one O(4)CaHf4 trigonal bipyramid, corners with two equivalent O(1)Hf4 trigonal pyramids,  an edgeedge with one N(3)CaHf4 trigonal bipyramid,  an edgeedge with one N(7)CaHf4 trigonal bipyramid,  an edgeedge with one O(4)CaHf4 trigonal bipyramid, edges with two equivalent N(5)CaHf4 trigonal bipyramids, edges with two equivalent N(8)CaHf4 trigonal bipyramids, and  an edgeedge with one N(6)Hf4 trigonal pyramid. In the fourth O site, O(4) is bonded to one Ca(1), one Hf(2), one Hf(4), one Hf(5), and one Hf(8) atom to form distorted OCaHf4 trigonal bipyramids that share  a cornercorner with one N(3)CaHf4 trigonal bipyramid,  a cornercorner with one N(5)CaHf4 trigonal bipyramid,  a cornercorner with one N(7)CaHf4 trigonal bipyramid,  a cornercorner with one N(8)CaHf4 trigonal bipyramid,  a cornercorner with one O(3)CaHf4 trigonal bipyramid, corners with two equivalent N(4)Hf4 trigonal pyramids,  an edgeedge with one N(5)CaHf4 trigonal bipyramid,  an edgeedge with one N(8)CaHf4 trigonal bipyramid,  an edgeedge with one O(3)CaHf4 trigonal bipyramid, edges with two equivalent N(3)CaHf4 trigonal bipyramids, and edges with two equivalent N(7)CaHf4 trigonal bipyramids. is represented by the CIF file [CIF]
data_CaHf8(N2O)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.528
_cell_length_b   5.516
_cell_length_c   10.829
_cell_angle_alpha   90.494
_cell_angle_beta   74.370
_cell_angle_gamma   59.697
_symmetry_Int_Tables_number   1
_cell_volume   270.353
_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
  Ca  Ca0  1  0.496  0.223  0.751  1.0
  Hf  Hf1  1  0.138  0.436  0.292  1.0
  Hf  Hf2  1  0.128  0.899  0.789  1.0
  Hf  Hf3  1  0.344  0.354  0.010  1.0
  Hf  Hf4  1  0.659  0.194  0.492  1.0
  Hf  Hf5  1  0.349  0.842  0.474  1.0
  Hf  Hf6  1  0.842  0.086  0.210  1.0
  Hf  Hf7  1  0.660  0.681  0.028  1.0
  Hf  Hf8  1  0.853  0.550  0.713  1.0
  N  N9  1  0.456  0.117  0.369  1.0
  N  N10  1  0.551  0.390  0.131  1.0
  N  N11  1  0.254  0.559  0.630  1.0
  N  N12  1  0.749  0.436  0.370  1.0
  N  N13  1  0.449  0.610  0.874  1.0
  N  N14  1  0.931  0.684  0.132  1.0
  N  N15  1  0.950  0.164  0.624  1.0
  N  N16  1  0.741  0.922  0.881  1.0
  O  O17  1  0.257  0.068  0.132  1.0
  O  O18  1  0.072  0.817  0.376  1.0
  O  O19  1  0.051  0.303  0.875  1.0
  O  O20  1  0.578  0.850  0.617  1.0
[/CIF]
.