The material described by NdZr9O20 is Fluorite-derived structured and crystallizes in the triclinic P-1 space group. Nd(1) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms. There are five inequivalent Zr sites. In the first Zr site, Zr(1) is bonded in a body-centered cubic geometry to one O(4), one O(5), one O(7), one O(9), two equivalent O(2), and two equivalent O(8) atoms. In the second Zr site, Zr(2) is bonded in a body-centered cubic geometry to one O(2), one O(3), one O(5), one O(6), one O(7), one O(8), and two equivalent O(1) atoms. In the third Zr site, Zr(3) is bonded in a body-centered cubic geometry to one O(10), one O(4), one O(5), one O(8), two equivalent O(6), and two equivalent O(9) atoms. In the fourth Zr site, Zr(4) is bonded in a body-centered cubic geometry to one O(1), one O(10), one O(2), one O(4), one O(6), one O(9), and two equivalent O(3) atoms. In the fifth Zr site, Zr(5) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(10), two equivalent O(5), and two equivalent O(7) atoms. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Zr(4), one Zr(5), and two equivalent Zr(2) atoms to form OZr4 tetrahedra that share  a cornercorner with one O(10)NdZr3 tetrahedra,  a cornercorner with one O(4)NdZr3 tetrahedra,  a cornercorner with one O(1)Zr4 tetrahedra,  a cornercorner with one O(6)Zr4 tetrahedra,  a cornercorner with one O(9)Zr4 tetrahedra, corners with two equivalent O(3)NdZr3 tetrahedra, corners with two equivalent O(7)NdZr3 tetrahedra, corners with two equivalent O(5)Zr4 tetrahedra, corners with two equivalent O(8)Zr4 tetrahedra, corners with three equivalent O(2)Zr4 tetrahedra,  an edgeedge with one O(10)NdZr3 tetrahedra,  an edgeedge with one O(3)NdZr3 tetrahedra,  an edgeedge with one O(7)NdZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra,  an edgeedge with one O(5)Zr4 tetrahedra, and  an edgeedge with one O(6)Zr4 tetrahedra. In the second O site, O(2) is bonded to one Zr(2), one Zr(4), and two equivalent Zr(1) atoms to form OZr4 tetrahedra that share  a cornercorner with one O(10)NdZr3 tetrahedra,  a cornercorner with one O(3)NdZr3 tetrahedra,  a cornercorner with one O(4)NdZr3 tetrahedra,  a cornercorner with one O(5)Zr4 tetrahedra,  a cornercorner with one O(9)Zr4 tetrahedra, corners with two equivalent O(6)Zr4 tetrahedra, corners with three equivalent O(7)NdZr3 tetrahedra, corners with three equivalent O(1)Zr4 tetrahedra, corners with three equivalent O(8)Zr4 tetrahedra,  an edgeedge with one O(3)NdZr3 tetrahedra,  an edgeedge with one O(4)NdZr3 tetrahedra,  an edgeedge with one O(2)Zr4 tetrahedra,  an edgeedge with one O(5)Zr4 tetrahedra,  an edgeedge with one O(8)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. In the third O site, O(3) is bonded to one Nd(1), one Zr(2), and two equivalent Zr(4) atoms to form ONdZr3 tetrahedra that share  a cornercorner with one O(3)NdZr3 tetrahedra,  a cornercorner with one O(7)NdZr3 tetrahedra,  a cornercorner with one O(2)Zr4 tetrahedra,  a cornercorner with one O(5)Zr4 tetrahedra,  a cornercorner with one O(8)Zr4 tetrahedra, corners with two equivalent O(10)NdZr3 tetrahedra, corners with two equivalent O(4)NdZr3 tetrahedra, corners with two equivalent O(1)Zr4 tetrahedra, corners with two equivalent O(9)Zr4 tetrahedra, corners with three equivalent O(6)Zr4 tetrahedra,  an edgeedge with one O(10)NdZr3 tetrahedra,  an edgeedge with one O(3)NdZr3 tetrahedra,  an edgeedge with one O(4)NdZr3 tetrahedra,  an edgeedge with one O(7)NdZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra, and  an edgeedge with one O(2)Zr4 tetrahedra. In the fourth O site, O(4) is bonded to one Nd(1), one Zr(1), one Zr(3), and one Zr(4) atom to form ONdZr3 tetrahedra that share  a cornercorner with one O(4)NdZr3 tetrahedra,  a cornercorner with one O(7)NdZr3 tetrahedra,  a cornercorner with one O(1)Zr4 tetrahedra,  a cornercorner with one O(2)Zr4 tetrahedra,  a cornercorner with one O(6)Zr4 tetrahedra,  a cornercorner with one O(8)Zr4 tetrahedra, corners with two equivalent O(10)NdZr3 tetrahedra, corners with two equivalent O(3)NdZr3 tetrahedra, corners with two equivalent O(5)Zr4 tetrahedra, corners with four equivalent O(9)Zr4 tetrahedra,  an edgeedge with one O(10)NdZr3 tetrahedra,  an edgeedge with one O(3)NdZr3 tetrahedra,  an edgeedge with one O(7)NdZr3 tetrahedra,  an edgeedge with one O(2)Zr4 tetrahedra,  an edgeedge with one O(6)Zr4 tetrahedra, and  an edgeedge with one O(8)Zr4 tetrahedra. In the fifth O site, O(5) is bonded to one Zr(1), one Zr(2), one Zr(3), and one Zr(5) atom to form OZr4 tetrahedra that share  a cornercorner with one O(10)NdZr3 tetrahedra,  a cornercorner with one O(3)NdZr3 tetrahedra,  a cornercorner with one O(2)Zr4 tetrahedra,  a cornercorner with one O(5)Zr4 tetrahedra,  a cornercorner with one O(6)Zr4 tetrahedra,  a cornercorner with one O(9)Zr4 tetrahedra, corners with two equivalent O(4)NdZr3 tetrahedra, corners with two equivalent O(7)NdZr3 tetrahedra, corners with two equivalent O(1)Zr4 tetrahedra, corners with four equivalent O(8)Zr4 tetrahedra,  an edgeedge with one O(10)NdZr3 tetrahedra,  an edgeedge with one O(7)NdZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra,  an edgeedge with one O(2)Zr4 tetrahedra,  an edgeedge with one O(6)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. In the sixth O site, O(6) is bonded to one Zr(2), one Zr(4), and two equivalent Zr(3) atoms to form OZr4 tetrahedra that share  a cornercorner with one O(4)NdZr3 tetrahedra,  a cornercorner with one O(7)NdZr3 tetrahedra,  a cornercorner with one O(1)Zr4 tetrahedra,  a cornercorner with one O(5)Zr4 tetrahedra,  a cornercorner with one O(8)Zr4 tetrahedra, corners with two equivalent O(2)Zr4 tetrahedra, corners with three equivalent O(10)NdZr3 tetrahedra, corners with three equivalent O(3)NdZr3 tetrahedra, corners with three equivalent O(9)Zr4 tetrahedra,  an edgeedge with one O(4)NdZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra,  an edgeedge with one O(5)Zr4 tetrahedra,  an edgeedge with one O(6)Zr4 tetrahedra,  an edgeedge with one O(8)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. In the seventh O site, O(7) is bonded to one Nd(1), one Zr(1), one Zr(2), and one Zr(5) atom to form ONdZr3 tetrahedra that share  a cornercorner with one O(3)NdZr3 tetrahedra,  a cornercorner with one O(4)NdZr3 tetrahedra,  a cornercorner with one O(6)Zr4 tetrahedra,  a cornercorner with one O(8)Zr4 tetrahedra,  a cornercorner with one O(9)Zr4 tetrahedra, corners with two equivalent O(10)NdZr3 tetrahedra, corners with two equivalent O(7)NdZr3 tetrahedra, corners with two equivalent O(1)Zr4 tetrahedra, corners with two equivalent O(5)Zr4 tetrahedra, corners with three equivalent O(2)Zr4 tetrahedra,  an edgeedge with one O(10)NdZr3 tetrahedra,  an edgeedge with one O(3)NdZr3 tetrahedra,  an edgeedge with one O(4)NdZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra,  an edgeedge with one O(5)Zr4 tetrahedra, and  an edgeedge with one O(8)Zr4 tetrahedra. In the eighth O site, O(8) is bonded to one Zr(2), one Zr(3), and two equivalent Zr(1) atoms to form OZr4 tetrahedra that share  a cornercorner with one O(10)NdZr3 tetrahedra,  a cornercorner with one O(3)NdZr3 tetrahedra,  a cornercorner with one O(4)NdZr3 tetrahedra,  a cornercorner with one O(7)NdZr3 tetrahedra,  a cornercorner with one O(6)Zr4 tetrahedra, corners with two equivalent O(1)Zr4 tetrahedra, corners with two equivalent O(9)Zr4 tetrahedra, corners with three equivalent O(2)Zr4 tetrahedra, corners with four equivalent O(5)Zr4 tetrahedra,  an edgeedge with one O(4)NdZr3 tetrahedra,  an edgeedge with one O(7)NdZr3 tetrahedra,  an edgeedge with one O(2)Zr4 tetrahedra,  an edgeedge with one O(6)Zr4 tetrahedra,  an edgeedge with one O(8)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. In the ninth O site, O(9) is bonded to one Zr(1), one Zr(4), and two equivalent Zr(3) atoms to form OZr4 tetrahedra that share  a cornercorner with one O(10)NdZr3 tetrahedra,  a cornercorner with one O(7)NdZr3 tetrahedra,  a cornercorner with one O(1)Zr4 tetrahedra,  a cornercorner with one O(2)Zr4 tetrahedra,  a cornercorner with one O(5)Zr4 tetrahedra, corners with two equivalent O(3)NdZr3 tetrahedra, corners with two equivalent O(8)Zr4 tetrahedra, corners with three equivalent O(6)Zr4 tetrahedra, corners with four equivalent O(4)NdZr3 tetrahedra,  an edgeedge with one O(10)NdZr3 tetrahedra,  an edgeedge with one O(2)Zr4 tetrahedra,  an edgeedge with one O(5)Zr4 tetrahedra,  an edgeedge with one O(6)Zr4 tetrahedra,  an edgeedge with one O(8)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. In the tenth O site, O(10) is bonded to one Nd(1), one Zr(3), one Zr(4), and one Zr(5) atom to form ONdZr3 tetrahedra that share  a cornercorner with one O(1)Zr4 tetrahedra,  a cornercorner with one O(2)Zr4 tetrahedra,  a cornercorner with one O(5)Zr4 tetrahedra,  a cornercorner with one O(8)Zr4 tetrahedra,  a cornercorner with one O(9)Zr4 tetrahedra, corners with two equivalent O(10)NdZr3 tetrahedra, corners with two equivalent O(3)NdZr3 tetrahedra, corners with two equivalent O(4)NdZr3 tetrahedra, corners with two equivalent O(7)NdZr3 tetrahedra, corners with three equivalent O(6)Zr4 tetrahedra,  an edgeedge with one O(3)NdZr3 tetrahedra,  an edgeedge with one O(4)NdZr3 tetrahedra,  an edgeedge with one O(7)NdZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra,  an edgeedge with one O(5)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. is represented by the CIF card [CIF]
data_NdZr9O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.300
_cell_length_b   7.276
_cell_length_c   8.135
_cell_angle_alpha   102.986
_cell_angle_beta   97.407
_cell_angle_gamma   106.734
_symmetry_Int_Tables_number   1
_cell_volume   340.390
_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
  Nd  Nd0  1  0.000  0.500  0.000  1.0
  Zr  Zr1  1  0.797  0.600  0.598  1.0
  Zr  Zr2  1  0.601  0.199  0.201  1.0
  Zr  Zr3  1  0.799  0.098  0.598  1.0
  Zr  Zr4  1  0.399  0.801  0.799  1.0
  Zr  Zr5  1  0.601  0.702  0.200  1.0
  Zr  Zr6  1  0.203  0.400  0.402  1.0
  Zr  Zr7  1  0.399  0.298  0.800  1.0
  Zr  Zr8  1  0.000  0.000  0.000  1.0
  Zr  Zr9  1  0.201  0.902  0.402  1.0
  O  O10  1  0.645  0.926  0.049  1.0
  O  O11  1  0.444  0.525  0.646  1.0
  O  O12  1  0.630  0.420  0.056  1.0
  O  O13  1  0.730  0.365  0.735  1.0
  O  O14  1  0.262  0.126  0.250  1.0
  O  O15  1  0.443  0.020  0.648  1.0
  O  O16  1  0.557  0.980  0.352  1.0
  O  O17  1  0.048  0.739  0.840  1.0
  O  O18  1  0.738  0.874  0.750  1.0
  O  O19  1  0.370  0.580  0.944  1.0
  O  O20  1  0.855  0.328  0.453  1.0
  O  O21  1  0.270  0.635  0.265  1.0
  O  O22  1  0.556  0.475  0.354  1.0
  O  O23  1  0.150  0.174  0.545  1.0
  O  O24  1  0.052  0.206  0.838  1.0
  O  O25  1  0.948  0.794  0.162  1.0
  O  O26  1  0.850  0.826  0.455  1.0
  O  O27  1  0.355  0.074  0.951  1.0
  O  O28  1  0.145  0.672  0.547  1.0
  O  O29  1  0.952  0.261  0.160  1.0
[/CIF]
.
The material described by NdZr9O20 is Fluorite-derived structured and crystallizes in the triclinic P-1 space group. Nd(1) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms. There are five inequivalent Zr sites. In the first Zr site, Zr(1) is bonded in a body-centered cubic geometry to one O(4), one O(5), one O(7), one O(9), two equivalent O(2), and two equivalent O(8) atoms. In the second Zr site, Zr(2) is bonded in a body-centered cubic geometry to one O(2), one O(3), one O(5), one O(6), one O(7), one O(8), and two equivalent O(1) atoms. In the third Zr site, Zr(3) is bonded in a body-centered cubic geometry to one O(10), one O(4), one O(5), one O(8), two equivalent O(6), and two equivalent O(9) atoms. In the fourth Zr site, Zr(4) is bonded in a body-centered cubic geometry to one O(1), one O(10), one O(2), one O(4), one O(6), one O(9), and two equivalent O(3) atoms. In the fifth Zr site, Zr(5) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(10), two equivalent O(5), and two equivalent O(7) atoms. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Zr(4), one Zr(5), and two equivalent Zr(2) atoms to form OZr4 tetrahedra that share  a cornercorner with one O(10)NdZr3 tetrahedra,  a cornercorner with one O(4)NdZr3 tetrahedra,  a cornercorner with one O(1)Zr4 tetrahedra,  a cornercorner with one O(6)Zr4 tetrahedra,  a cornercorner with one O(9)Zr4 tetrahedra, corners with two equivalent O(3)NdZr3 tetrahedra, corners with two equivalent O(7)NdZr3 tetrahedra, corners with two equivalent O(5)Zr4 tetrahedra, corners with two equivalent O(8)Zr4 tetrahedra, corners with three equivalent O(2)Zr4 tetrahedra,  an edgeedge with one O(10)NdZr3 tetrahedra,  an edgeedge with one O(3)NdZr3 tetrahedra,  an edgeedge with one O(7)NdZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra,  an edgeedge with one O(5)Zr4 tetrahedra, and  an edgeedge with one O(6)Zr4 tetrahedra. In the second O site, O(2) is bonded to one Zr(2), one Zr(4), and two equivalent Zr(1) atoms to form OZr4 tetrahedra that share  a cornercorner with one O(10)NdZr3 tetrahedra,  a cornercorner with one O(3)NdZr3 tetrahedra,  a cornercorner with one O(4)NdZr3 tetrahedra,  a cornercorner with one O(5)Zr4 tetrahedra,  a cornercorner with one O(9)Zr4 tetrahedra, corners with two equivalent O(6)Zr4 tetrahedra, corners with three equivalent O(7)NdZr3 tetrahedra, corners with three equivalent O(1)Zr4 tetrahedra, corners with three equivalent O(8)Zr4 tetrahedra,  an edgeedge with one O(3)NdZr3 tetrahedra,  an edgeedge with one O(4)NdZr3 tetrahedra,  an edgeedge with one O(2)Zr4 tetrahedra,  an edgeedge with one O(5)Zr4 tetrahedra,  an edgeedge with one O(8)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. In the third O site, O(3) is bonded to one Nd(1), one Zr(2), and two equivalent Zr(4) atoms to form ONdZr3 tetrahedra that share  a cornercorner with one O(3)NdZr3 tetrahedra,  a cornercorner with one O(7)NdZr3 tetrahedra,  a cornercorner with one O(2)Zr4 tetrahedra,  a cornercorner with one O(5)Zr4 tetrahedra,  a cornercorner with one O(8)Zr4 tetrahedra, corners with two equivalent O(10)NdZr3 tetrahedra, corners with two equivalent O(4)NdZr3 tetrahedra, corners with two equivalent O(1)Zr4 tetrahedra, corners with two equivalent O(9)Zr4 tetrahedra, corners with three equivalent O(6)Zr4 tetrahedra,  an edgeedge with one O(10)NdZr3 tetrahedra,  an edgeedge with one O(3)NdZr3 tetrahedra,  an edgeedge with one O(4)NdZr3 tetrahedra,  an edgeedge with one O(7)NdZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra, and  an edgeedge with one O(2)Zr4 tetrahedra. In the fourth O site, O(4) is bonded to one Nd(1), one Zr(1), one Zr(3), and one Zr(4) atom to form ONdZr3 tetrahedra that share  a cornercorner with one O(4)NdZr3 tetrahedra,  a cornercorner with one O(7)NdZr3 tetrahedra,  a cornercorner with one O(1)Zr4 tetrahedra,  a cornercorner with one O(2)Zr4 tetrahedra,  a cornercorner with one O(6)Zr4 tetrahedra,  a cornercorner with one O(8)Zr4 tetrahedra, corners with two equivalent O(10)NdZr3 tetrahedra, corners with two equivalent O(3)NdZr3 tetrahedra, corners with two equivalent O(5)Zr4 tetrahedra, corners with four equivalent O(9)Zr4 tetrahedra,  an edgeedge with one O(10)NdZr3 tetrahedra,  an edgeedge with one O(3)NdZr3 tetrahedra,  an edgeedge with one O(7)NdZr3 tetrahedra,  an edgeedge with one O(2)Zr4 tetrahedra,  an edgeedge with one O(6)Zr4 tetrahedra, and  an edgeedge with one O(8)Zr4 tetrahedra. In the fifth O site, O(5) is bonded to one Zr(1), one Zr(2), one Zr(3), and one Zr(5) atom to form OZr4 tetrahedra that share  a cornercorner with one O(10)NdZr3 tetrahedra,  a cornercorner with one O(3)NdZr3 tetrahedra,  a cornercorner with one O(2)Zr4 tetrahedra,  a cornercorner with one O(5)Zr4 tetrahedra,  a cornercorner with one O(6)Zr4 tetrahedra,  a cornercorner with one O(9)Zr4 tetrahedra, corners with two equivalent O(4)NdZr3 tetrahedra, corners with two equivalent O(7)NdZr3 tetrahedra, corners with two equivalent O(1)Zr4 tetrahedra, corners with four equivalent O(8)Zr4 tetrahedra,  an edgeedge with one O(10)NdZr3 tetrahedra,  an edgeedge with one O(7)NdZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra,  an edgeedge with one O(2)Zr4 tetrahedra,  an edgeedge with one O(6)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. In the sixth O site, O(6) is bonded to one Zr(2), one Zr(4), and two equivalent Zr(3) atoms to form OZr4 tetrahedra that share  a cornercorner with one O(4)NdZr3 tetrahedra,  a cornercorner with one O(7)NdZr3 tetrahedra,  a cornercorner with one O(1)Zr4 tetrahedra,  a cornercorner with one O(5)Zr4 tetrahedra,  a cornercorner with one O(8)Zr4 tetrahedra, corners with two equivalent O(2)Zr4 tetrahedra, corners with three equivalent O(10)NdZr3 tetrahedra, corners with three equivalent O(3)NdZr3 tetrahedra, corners with three equivalent O(9)Zr4 tetrahedra,  an edgeedge with one O(4)NdZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra,  an edgeedge with one O(5)Zr4 tetrahedra,  an edgeedge with one O(6)Zr4 tetrahedra,  an edgeedge with one O(8)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. In the seventh O site, O(7) is bonded to one Nd(1), one Zr(1), one Zr(2), and one Zr(5) atom to form ONdZr3 tetrahedra that share  a cornercorner with one O(3)NdZr3 tetrahedra,  a cornercorner with one O(4)NdZr3 tetrahedra,  a cornercorner with one O(6)Zr4 tetrahedra,  a cornercorner with one O(8)Zr4 tetrahedra,  a cornercorner with one O(9)Zr4 tetrahedra, corners with two equivalent O(10)NdZr3 tetrahedra, corners with two equivalent O(7)NdZr3 tetrahedra, corners with two equivalent O(1)Zr4 tetrahedra, corners with two equivalent O(5)Zr4 tetrahedra, corners with three equivalent O(2)Zr4 tetrahedra,  an edgeedge with one O(10)NdZr3 tetrahedra,  an edgeedge with one O(3)NdZr3 tetrahedra,  an edgeedge with one O(4)NdZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra,  an edgeedge with one O(5)Zr4 tetrahedra, and  an edgeedge with one O(8)Zr4 tetrahedra. In the eighth O site, O(8) is bonded to one Zr(2), one Zr(3), and two equivalent Zr(1) atoms to form OZr4 tetrahedra that share  a cornercorner with one O(10)NdZr3 tetrahedra,  a cornercorner with one O(3)NdZr3 tetrahedra,  a cornercorner with one O(4)NdZr3 tetrahedra,  a cornercorner with one O(7)NdZr3 tetrahedra,  a cornercorner with one O(6)Zr4 tetrahedra, corners with two equivalent O(1)Zr4 tetrahedra, corners with two equivalent O(9)Zr4 tetrahedra, corners with three equivalent O(2)Zr4 tetrahedra, corners with four equivalent O(5)Zr4 tetrahedra,  an edgeedge with one O(4)NdZr3 tetrahedra,  an edgeedge with one O(7)NdZr3 tetrahedra,  an edgeedge with one O(2)Zr4 tetrahedra,  an edgeedge with one O(6)Zr4 tetrahedra,  an edgeedge with one O(8)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. In the ninth O site, O(9) is bonded to one Zr(1), one Zr(4), and two equivalent Zr(3) atoms to form OZr4 tetrahedra that share  a cornercorner with one O(10)NdZr3 tetrahedra,  a cornercorner with one O(7)NdZr3 tetrahedra,  a cornercorner with one O(1)Zr4 tetrahedra,  a cornercorner with one O(2)Zr4 tetrahedra,  a cornercorner with one O(5)Zr4 tetrahedra, corners with two equivalent O(3)NdZr3 tetrahedra, corners with two equivalent O(8)Zr4 tetrahedra, corners with three equivalent O(6)Zr4 tetrahedra, corners with four equivalent O(4)NdZr3 tetrahedra,  an edgeedge with one O(10)NdZr3 tetrahedra,  an edgeedge with one O(2)Zr4 tetrahedra,  an edgeedge with one O(5)Zr4 tetrahedra,  an edgeedge with one O(6)Zr4 tetrahedra,  an edgeedge with one O(8)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. In the tenth O site, O(10) is bonded to one Nd(1), one Zr(3), one Zr(4), and one Zr(5) atom to form ONdZr3 tetrahedra that share  a cornercorner with one O(1)Zr4 tetrahedra,  a cornercorner with one O(2)Zr4 tetrahedra,  a cornercorner with one O(5)Zr4 tetrahedra,  a cornercorner with one O(8)Zr4 tetrahedra,  a cornercorner with one O(9)Zr4 tetrahedra, corners with two equivalent O(10)NdZr3 tetrahedra, corners with two equivalent O(3)NdZr3 tetrahedra, corners with two equivalent O(4)NdZr3 tetrahedra, corners with two equivalent O(7)NdZr3 tetrahedra, corners with three equivalent O(6)Zr4 tetrahedra,  an edgeedge with one O(3)NdZr3 tetrahedra,  an edgeedge with one O(4)NdZr3 tetrahedra,  an edgeedge with one O(7)NdZr3 tetrahedra,  an edgeedge with one O(1)Zr4 tetrahedra,  an edgeedge with one O(5)Zr4 tetrahedra, and  an edgeedge with one O(9)Zr4 tetrahedra. is represented by the CIF card [CIF]
data_NdZr9O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.300
_cell_length_b   7.276
_cell_length_c   8.135
_cell_angle_alpha   102.986
_cell_angle_beta   97.407
_cell_angle_gamma   106.734
_symmetry_Int_Tables_number   1
_cell_volume   340.390
_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
  Nd  Nd0  1  0.000  0.500  0.000  1.0
  Zr  Zr1  1  0.797  0.600  0.598  1.0
  Zr  Zr2  1  0.601  0.199  0.201  1.0
  Zr  Zr3  1  0.799  0.098  0.598  1.0
  Zr  Zr4  1  0.399  0.801  0.799  1.0
  Zr  Zr5  1  0.601  0.702  0.200  1.0
  Zr  Zr6  1  0.203  0.400  0.402  1.0
  Zr  Zr7  1  0.399  0.298  0.800  1.0
  Zr  Zr8  1  0.000  0.000  0.000  1.0
  Zr  Zr9  1  0.201  0.902  0.402  1.0
  O  O10  1  0.645  0.926  0.049  1.0
  O  O11  1  0.444  0.525  0.646  1.0
  O  O12  1  0.630  0.420  0.056  1.0
  O  O13  1  0.730  0.365  0.735  1.0
  O  O14  1  0.262  0.126  0.250  1.0
  O  O15  1  0.443  0.020  0.648  1.0
  O  O16  1  0.557  0.980  0.352  1.0
  O  O17  1  0.048  0.739  0.840  1.0
  O  O18  1  0.738  0.874  0.750  1.0
  O  O19  1  0.370  0.580  0.944  1.0
  O  O20  1  0.855  0.328  0.453  1.0
  O  O21  1  0.270  0.635  0.265  1.0
  O  O22  1  0.556  0.475  0.354  1.0
  O  O23  1  0.150  0.174  0.545  1.0
  O  O24  1  0.052  0.206  0.838  1.0
  O  O25  1  0.948  0.794  0.162  1.0
  O  O26  1  0.850  0.826  0.455  1.0
  O  O27  1  0.355  0.074  0.951  1.0
  O  O28  1  0.145  0.672  0.547  1.0
  O  O29  1  0.952  0.261  0.160  1.0
[/CIF]
.