The material structure described by Gd2Ce2O7 crystallizes in the monoclinic C2 space group. There are five inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a body-centered cubic geometry to one O(1), one O(12), one O(13), one O(14), one O(2), one O(4), one O(5), and one O(9) atom. In the second Gd site, Gd(2) is bonded in a body-centered cubic geometry to one O(10), one O(13), one O(14), one O(2), one O(3), one O(5), one O(6), and one O(7) atom. In the third Gd site, Gd(3) is bonded in a body-centered cubic geometry to two equivalent O(14), two equivalent O(3), two equivalent O(4), and two equivalent O(8) atoms. In the fourth Gd site, Gd(4) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(11), two equivalent O(13), and two equivalent O(6) atoms. In the fifth Gd site, Gd(5) is bonded in a 7-coordinate geometry to one O(1), one O(13), one O(2), one O(3), one O(7), one O(8), and one O(9) atom. There are five inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to one O(10), one O(11), one O(3), one O(6), one O(7), and one O(8) atom to form distorted corner-sharing CeO6 octahedra. The corner-sharing octahedral tilt angles range from 52-55°. In the second Ce site, Ce(2) is bonded to one O(1), one O(11), one O(12), one O(4), one O(8), and one O(9) atom to form distorted corner-sharing CeO6 octahedra. The corner-sharing octahedral tilt angles range from 52-55°. In the third Ce site, Ce(3) is bonded to two equivalent O(12), two equivalent O(5), and two equivalent O(7) atoms to form distorted corner-sharing CeO6 octahedra. The corner-sharing octahedral tilt angles range from 52-55°. In the fourth Ce site, Ce(4) is bonded to two equivalent O(10), two equivalent O(2), and two equivalent O(9) atoms to form distorted corner-sharing CeO6 octahedra. The corner-sharing octahedral tilt angles range from 52-55°. In the fifth Ce site, Ce(5) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(12), one O(14), one O(4), one O(5), and one O(6) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Gd(1), one Gd(4), one Gd(5), and one Ce(2) atom to form OCeGd3 tetrahedra that share  a cornercorner with one O(5)Ce2Gd2 tetrahedra,  a cornercorner with one O(1)CeGd3 tetrahedra,  a cornercorner with one O(14)CeGd3 tetrahedra,  a cornercorner with one O(3)CeGd3 tetrahedra, corners with two equivalent O(4)Ce2Gd2 tetrahedra, corners with two equivalent O(6)Ce2Gd2 tetrahedra, corners with two equivalent O(2)CeGd3 tetrahedra,  a cornercorner with one O(7)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(9)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(11)Ce3Gd trigonal pyramid, edges with two equivalent O(13)Gd4 tetrahedra,  an edgeedge with one O(8)Ce2Gd2 trigonal pyramid,  an edgeedge with one O(9)Ce2Gd2 trigonal pyramid,  an edgeedge with one O(11)Ce3Gd trigonal pyramid, and  an edgeedge with one O(12)Ce3Gd trigonal pyramid. In the second O site, O(2) is bonded to one Gd(1), one Gd(2), one Gd(5), and one Ce(4) atom to form OCeGd3 tetrahedra that share  a cornercorner with one O(4)Ce2Gd2 tetrahedra,  a cornercorner with one O(6)Ce2Gd2 tetrahedra,  a cornercorner with one O(2)CeGd3 tetrahedra,  a cornercorner with one O(13)Gd4 tetrahedra, corners with two equivalent O(5)Ce2Gd2 tetrahedra, corners with two equivalent O(1)CeGd3 tetrahedra, corners with two equivalent O(3)CeGd3 tetrahedra,  a cornercorner with one O(8)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(10)Ce3Gd trigonal pyramid,  a cornercorner with one O(12)Ce3Gd trigonal pyramid,  an edgeedge with one O(14)CeGd3 tetrahedra,  an edgeedge with one O(13)Gd4 tetrahedra,  an edgeedge with one O(7)Ce2Gd2 trigonal pyramid,  an edgeedge with one O(10)Ce3Gd trigonal pyramid, and edges with two equivalent O(9)Ce2Gd2 trigonal pyramids. In the third O site, O(3) is bonded to one Gd(2), one Gd(3), one Gd(5), and one Ce(1) atom to form OCeGd3 tetrahedra that share  a cornercorner with one O(5)Ce2Gd2 tetrahedra,  a cornercorner with one O(1)CeGd3 tetrahedra,  a cornercorner with one O(14)CeGd3 tetrahedra,  a cornercorner with one O(3)CeGd3 tetrahedra, corners with two equivalent O(4)Ce2Gd2 tetrahedra, corners with two equivalent O(6)Ce2Gd2 tetrahedra, corners with two equivalent O(2)CeGd3 tetrahedra,  a cornercorner with one O(7)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(9)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(11)Ce3Gd trigonal pyramid,  an edgeedge with one O(14)CeGd3 tetrahedra,  an edgeedge with one O(13)Gd4 tetrahedra,  an edgeedge with one O(7)Ce2Gd2 trigonal pyramid,  an edgeedge with one O(10)Ce3Gd trigonal pyramid, and edges with two equivalent O(8)Ce2Gd2 trigonal pyramids. In the fourth O site, O(4) is bonded to one Gd(1), one Gd(3), one Ce(2), and one Ce(5) atom to form OCe2Gd2 tetrahedra that share  a cornercorner with one O(4)Ce2Gd2 tetrahedra,  a cornercorner with one O(6)Ce2Gd2 tetrahedra,  a cornercorner with one O(2)CeGd3 tetrahedra,  a cornercorner with one O(13)Gd4 tetrahedra, corners with two equivalent O(5)Ce2Gd2 tetrahedra, corners with two equivalent O(1)CeGd3 tetrahedra, corners with two equivalent O(3)CeGd3 tetrahedra,  a cornercorner with one O(8)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(10)Ce3Gd trigonal pyramid,  a cornercorner with one O(12)Ce3Gd trigonal pyramid, edges with two equivalent O(14)CeGd3 tetrahedra,  an edgeedge with one O(8)Ce2Gd2 trigonal pyramid,  an edgeedge with one O(9)Ce2Gd2 trigonal pyramid,  an edgeedge with one O(11)Ce3Gd trigonal pyramid, and  an edgeedge with one O(12)Ce3Gd trigonal pyramid. In the fifth O site, O(5) is bonded to one Gd(1), one Gd(2), one Ce(3), and one Ce(5) atom to form OCe2Gd2 tetrahedra that share  a cornercorner with one O(5)Ce2Gd2 tetrahedra,  a cornercorner with one O(1)CeGd3 tetrahedra,  a cornercorner with one O(14)CeGd3 tetrahedra,  a cornercorner with one O(3)CeGd3 tetrahedra, corners with two equivalent O(4)Ce2Gd2 tetrahedra, corners with two equivalent O(6)Ce2Gd2 tetrahedra, corners with two equivalent O(2)CeGd3 tetrahedra,  a cornercorner with one O(7)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(9)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(11)Ce3Gd trigonal pyramid,  an edgeedge with one O(14)CeGd3 tetrahedra,  an edgeedge with one O(13)Gd4 tetrahedra,  an edgeedge with one O(7)Ce2Gd2 trigonal pyramid,  an edgeedge with one O(10)Ce3Gd trigonal pyramid, and edges with two equivalent O(12)Ce3Gd trigonal pyramids. In the sixth O site, O(6) is bonded to one Gd(2), one Gd(4), one Ce(1), and one Ce(5) atom to form OCe2Gd2 tetrahedra that share  a cornercorner with one O(4)Ce2Gd2 tetrahedra,  a cornercorner with one O(6)Ce2Gd2 tetrahedra,  a cornercorner with one O(2)CeGd3 tetrahedra,  a cornercorner with one O(13)Gd4 tetrahedra, corners with two equivalent O(5)Ce2Gd2 tetrahedra, corners with two equivalent O(1)CeGd3 tetrahedra, corners with two equivalent O(3)CeGd3 tetrahedra,  a cornercorner with one O(8)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(10)Ce3Gd trigonal pyramid,  a cornercorner with one O(12)Ce3Gd trigonal pyramid,  an edgeedge with one O(14)CeGd3 tetrahedra,  an edgeedge with one O(13)Gd4 tetrahedra,  an edgeedge with one O(7)Ce2Gd2 trigonal pyramid,  an edgeedge with one O(10)Ce3Gd trigonal pyramid, and edges with two equivalent O(11)Ce3Gd trigonal pyramids. In the seventh O site, O(7) is bonded to one Gd(2), one Gd(5), one Ce(1), and one Ce(3) atom to form distorted OCe2Gd2 trigonal pyramids that share  a cornercorner with one O(5)Ce2Gd2 tetrahedra,  a cornercorner with one O(1)CeGd3 tetrahedra,  a cornercorner with one O(14)CeGd3 tetrahedra,  a cornercorner with one O(3)CeGd3 tetrahedra, corners with two equivalent O(13)Gd4 tetrahedra,  a cornercorner with one O(7)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(9)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(11)Ce3Gd trigonal pyramid, corners with two equivalent O(8)Ce2Gd2 trigonal pyramids, corners with two equivalent O(10)Ce3Gd trigonal pyramids, corners with two equivalent O(12)Ce3Gd trigonal pyramids,  an edgeedge with one O(5)Ce2Gd2 tetrahedra,  an edgeedge with one O(6)Ce2Gd2 tetrahedra,  an edgeedge with one O(2)CeGd3 tetrahedra, and  an edgeedge with one O(3)CeGd3 tetrahedra. In the eighth O site, O(8) is bonded to one Gd(3), one Gd(5), one Ce(1), and one Ce(2) atom to form distorted OCe2Gd2 trigonal pyramids that share  a cornercorner with one O(4)Ce2Gd2 tetrahedra,  a cornercorner with one O(6)Ce2Gd2 tetrahedra,  a cornercorner with one O(2)CeGd3 tetrahedra,  a cornercorner with one O(13)Gd4 tetrahedra, corners with two equivalent O(14)CeGd3 tetrahedra,  a cornercorner with one O(8)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(10)Ce3Gd trigonal pyramid,  a cornercorner with one O(12)Ce3Gd trigonal pyramid, corners with two equivalent O(7)Ce2Gd2 trigonal pyramids, corners with two equivalent O(9)Ce2Gd2 trigonal pyramids, corners with two equivalent O(11)Ce3Gd trigonal pyramids,  an edgeedge with one O(4)Ce2Gd2 tetrahedra,  an edgeedge with one O(1)CeGd3 tetrahedra, and edges with two equivalent O(3)CeGd3 tetrahedra. In the ninth O site, O(9) is bonded to one Gd(1), one Gd(5), one Ce(2), and one Ce(4) atom to form distorted OCe2Gd2 trigonal pyramids that share  a cornercorner with one O(5)Ce2Gd2 tetrahedra,  a cornercorner with one O(1)CeGd3 tetrahedra,  a cornercorner with one O(14)CeGd3 tetrahedra,  a cornercorner with one O(3)CeGd3 tetrahedra, corners with two equivalent O(13)Gd4 tetrahedra,  a cornercorner with one O(7)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(9)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(11)Ce3Gd trigonal pyramid, corners with two equivalent O(8)Ce2Gd2 trigonal pyramids, corners with two equivalent O(10)Ce3Gd trigonal pyramids, corners with two equivalent O(12)Ce3Gd trigonal pyramids,  an edgeedge with one O(4)Ce2Gd2 tetrahedra,  an edgeedge with one O(1)CeGd3 tetrahedra, and edges with two equivalent O(2)CeGd3 tetrahedra. In the tenth O site, O(10) is bonded to one Gd(2), one Ce(1), one Ce(4), and one Ce(5) atom to form distorted OCe3Gd trigonal pyramids that share  a cornercorner with one O(4)Ce2Gd2 tetrahedra,  a cornercorner with one O(6)Ce2Gd2 tetrahedra,  a cornercorner with one O(2)CeGd3 tetrahedra,  a cornercorner with one O(13)Gd4 tetrahedra, corners with two equivalent O(14)CeGd3 tetrahedra,  a cornercorner with one O(8)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(10)Ce3Gd trigonal pyramid,  a cornercorner with one O(12)Ce3Gd trigonal pyramid, corners with two equivalent O(7)Ce2Gd2 trigonal pyramids, corners with two equivalent O(9)Ce2Gd2 trigonal pyramids, corners with two equivalent O(11)Ce3Gd trigonal pyramids,  an edgeedge with one O(5)Ce2Gd2 tetrahedra,  an edgeedge with one O(6)Ce2Gd2 tetrahedra,  an edgeedge with one O(2)CeGd3 tetrahedra, and  an edgeedge with one O(3)CeGd3 tetrahedra. In the eleventh O site, O(11) is bonded to one Gd(4), one Ce(1), one Ce(2), and one Ce(5) atom to form distorted OCe3Gd trigonal pyramids that share  a cornercorner with one O(5)Ce2Gd2 tetrahedra,  a cornercorner with one O(1)CeGd3 tetrahedra,  a cornercorner with one O(14)CeGd3 tetrahedra,  a cornercorner with one O(3)CeGd3 tetrahedra, corners with two equivalent O(13)Gd4 tetrahedra,  a cornercorner with one O(7)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(9)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(11)Ce3Gd trigonal pyramid, corners with two equivalent O(8)Ce2Gd2 trigonal pyramids, corners with two equivalent O(10)Ce3Gd trigonal pyramids, corners with two equivalent O(12)Ce3Gd trigonal pyramids,  an edgeedge with one O(4)Ce2Gd2 tetrahedra,  an edgeedge with one O(1)CeGd3 tetrahedra, and edges with two equivalent O(6)Ce2Gd2 tetrahedra. In the twelfth O site, O(12) is bonded to one Gd(1), one Ce(2), one Ce(3), and one Ce(5) atom to form distorted OCe3Gd trigonal pyramids that share  a cornercorner with one O(4)Ce2Gd2 tetrahedra,  a cornercorner with one O(6)Ce2Gd2 tetrahedra,  a cornercorner with one O(2)CeGd3 tetrahedra,  a cornercorner with one O(13)Gd4 tetrahedra, corners with two equivalent O(14)CeGd3 tetrahedra,  a cornercorner with one O(8)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(10)Ce3Gd trigonal pyramid,  a cornercorner with one O(12)Ce3Gd trigonal pyramid, corners with two equivalent O(7)Ce2Gd2 trigonal pyramids, corners with two equivalent O(9)Ce2Gd2 trigonal pyramids, corners with two equivalent O(11)Ce3Gd trigonal pyramids,  an edgeedge with one O(4)Ce2Gd2 tetrahedra,  an edgeedge with one O(1)CeGd3 tetrahedra, and edges with two equivalent O(5)Ce2Gd2 tetrahedra. In the thirteenth O site, O(13) is bonded to one Gd(1), one Gd(2), one Gd(4), and one Gd(5) atom to form OGd4 tetrahedra that share  a cornercorner with one O(4)Ce2Gd2 tetrahedra,  a cornercorner with one O(6)Ce2Gd2 tetrahedra,  a cornercorner with one O(2)CeGd3 tetrahedra,  a cornercorner with one O(13)Gd4 tetrahedra, corners with two equivalent O(14)CeGd3 tetrahedra,  a cornercorner with one O(8)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(10)Ce3Gd trigonal pyramid,  a cornercorner with one O(12)Ce3Gd trigonal pyramid, corners with two equivalent O(7)Ce2Gd2 trigonal pyramids, corners with two equivalent O(9)Ce2Gd2 trigonal pyramids, corners with two equivalent O(11)Ce3Gd trigonal pyramids,  an edgeedge with one O(5)Ce2Gd2 tetrahedra,  an edgeedge with one O(6)Ce2Gd2 tetrahedra,  an edgeedge with one O(2)CeGd3 tetrahedra,  an edgeedge with one O(3)CeGd3 tetrahedra, and edges with two equivalent O(1)CeGd3 tetrahedra. In the fourteenth O site, O(14) is bonded to one Gd(1), one Gd(2), one Gd(3), and one Ce(5) atom to form OCeGd3 tetrahedra that share  a cornercorner with one O(5)Ce2Gd2 tetrahedra,  a cornercorner with one O(1)CeGd3 tetrahedra,  a cornercorner with one O(14)CeGd3 tetrahedra,  a cornercorner with one O(3)CeGd3 tetrahedra, corners with two equivalent O(13)Gd4 tetrahedra,  a cornercorner with one O(7)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(9)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(11)Ce3Gd trigonal pyramid, corners with two equivalent O(8)Ce2Gd2 trigonal pyramids, corners with two equivalent O(10)Ce3Gd trigonal pyramids, corners with two equivalent O(12)Ce3Gd trigonal pyramids,  an edgeedge with one O(5)Ce2Gd2 tetrahedra,  an edgeedge with one O(6)Ce2Gd2 tetrahedra,  an edgeedge with one O(2)CeGd3 tetrahedra,  an edgeedge with one O(3)CeGd3 tetrahedra, and edges with two equivalent O(4)Ce2Gd2 tetrahedra. is represented by the CIF card [CIF]
data_Ce2Gd2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.539
_cell_length_b   9.539
_cell_length_c   11.026
_cell_angle_alpha   54.813
_cell_angle_beta   54.813
_cell_angle_gamma   70.601
_symmetry_Int_Tables_number   1
_cell_volume   670.163
_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
  Ce  Ce0  1  0.747  0.751  0.228  1.0
  Ce  Ce1  1  0.024  0.522  0.476  1.0
  Ce  Ce2  1  0.772  0.228  0.500  1.0
  Ce  Ce3  1  0.249  0.253  0.772  1.0
  Ce  Ce4  1  0.478  0.976  0.524  1.0
  Ce  Ce5  1  0.726  0.274  0.000  1.0
  Ce  Ce6  1  0.025  1.000  0.250  1.0
  Ce  Ce7  1  0.000  0.975  0.750  1.0
  Gd  Gd8  1  0.746  0.749  0.754  1.0
  Gd  Gd9  1  0.500  0.999  0.001  1.0
  Gd  Gd10  1  0.252  0.748  0.500  1.0
  Gd  Gd11  1  0.251  0.254  0.246  1.0
  Gd  Gd12  1  0.001  0.500  0.999  1.0
  Gd  Gd13  1  0.253  0.747  0.000  1.0
  Gd  Gd14  1  0.476  0.499  0.774  1.0
  Gd  Gd15  1  0.501  0.524  0.226  1.0
  O  O16  1  0.492  0.749  0.750  1.0
  O  O17  1  0.498  0.258  0.001  1.0
  O  O18  1  0.249  0.494  0.758  1.0
  O  O19  1  0.251  0.508  0.250  1.0
  O  O20  1  0.742  0.502  0.999  1.0
  O  O21  1  0.506  0.751  0.242  1.0
  O  O22  1  0.010  0.757  0.487  1.0
  O  O23  1  0.003  0.238  0.255  1.0
  O  O24  1  0.246  0.007  0.007  1.0
  O  O25  1  0.243  0.990  0.513  1.0
  O  O26  1  0.762  0.997  0.745  1.0
  O  O27  1  0.993  0.754  0.993  1.0
  O  O28  1  0.519  0.263  0.710  1.0
  O  O29  1  0.538  0.757  0.475  1.0
  O  O30  1  0.777  0.480  0.729  1.0
  O  O31  1  0.737  0.481  0.290  1.0
  O  O32  1  0.243  0.462  0.525  1.0
  O  O33  1  0.520  0.223  0.271  1.0
  O  O34  1  0.982  0.232  0.998  1.0
  O  O35  1  0.960  0.748  0.270  1.0
  O  O36  1  0.731  0.021  0.483  1.0
  O  O37  1  0.768  0.018  0.002  1.0
  O  O38  1  0.252  0.040  0.730  1.0
  O  O39  1  0.979  0.269  0.517  1.0
  O  O40  1  0.240  0.500  0.009  1.0
  O  O41  1  0.500  0.760  0.991  1.0
  O  O42  1  0.254  1.000  0.251  1.0
  O  O43  1  0.000  0.746  0.749  1.0
[/CIF]
.
The material structure described by Gd2Ce2O7 crystallizes in the monoclinic C2 space group. There are five inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a body-centered cubic geometry to one O(1), one O(12), one O(13), one O(14), one O(2), one O(4), one O(5), and one O(9) atom. In the second Gd site, Gd(2) is bonded in a body-centered cubic geometry to one O(10), one O(13), one O(14), one O(2), one O(3), one O(5), one O(6), and one O(7) atom. In the third Gd site, Gd(3) is bonded in a body-centered cubic geometry to two equivalent O(14), two equivalent O(3), two equivalent O(4), and two equivalent O(8) atoms. In the fourth Gd site, Gd(4) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(11), two equivalent O(13), and two equivalent O(6) atoms. In the fifth Gd site, Gd(5) is bonded in a 7-coordinate geometry to one O(1), one O(13), one O(2), one O(3), one O(7), one O(8), and one O(9) atom. There are five inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to one O(10), one O(11), one O(3), one O(6), one O(7), and one O(8) atom to form distorted corner-sharing CeO6 octahedra. The corner-sharing octahedral tilt angles range from 52-55°. In the second Ce site, Ce(2) is bonded to one O(1), one O(11), one O(12), one O(4), one O(8), and one O(9) atom to form distorted corner-sharing CeO6 octahedra. The corner-sharing octahedral tilt angles range from 52-55°. In the third Ce site, Ce(3) is bonded to two equivalent O(12), two equivalent O(5), and two equivalent O(7) atoms to form distorted corner-sharing CeO6 octahedra. The corner-sharing octahedral tilt angles range from 52-55°. In the fourth Ce site, Ce(4) is bonded to two equivalent O(10), two equivalent O(2), and two equivalent O(9) atoms to form distorted corner-sharing CeO6 octahedra. The corner-sharing octahedral tilt angles range from 52-55°. In the fifth Ce site, Ce(5) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(12), one O(14), one O(4), one O(5), and one O(6) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Gd(1), one Gd(4), one Gd(5), and one Ce(2) atom to form OCeGd3 tetrahedra that share  a cornercorner with one O(5)Ce2Gd2 tetrahedra,  a cornercorner with one O(1)CeGd3 tetrahedra,  a cornercorner with one O(14)CeGd3 tetrahedra,  a cornercorner with one O(3)CeGd3 tetrahedra, corners with two equivalent O(4)Ce2Gd2 tetrahedra, corners with two equivalent O(6)Ce2Gd2 tetrahedra, corners with two equivalent O(2)CeGd3 tetrahedra,  a cornercorner with one O(7)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(9)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(11)Ce3Gd trigonal pyramid, edges with two equivalent O(13)Gd4 tetrahedra,  an edgeedge with one O(8)Ce2Gd2 trigonal pyramid,  an edgeedge with one O(9)Ce2Gd2 trigonal pyramid,  an edgeedge with one O(11)Ce3Gd trigonal pyramid, and  an edgeedge with one O(12)Ce3Gd trigonal pyramid. In the second O site, O(2) is bonded to one Gd(1), one Gd(2), one Gd(5), and one Ce(4) atom to form OCeGd3 tetrahedra that share  a cornercorner with one O(4)Ce2Gd2 tetrahedra,  a cornercorner with one O(6)Ce2Gd2 tetrahedra,  a cornercorner with one O(2)CeGd3 tetrahedra,  a cornercorner with one O(13)Gd4 tetrahedra, corners with two equivalent O(5)Ce2Gd2 tetrahedra, corners with two equivalent O(1)CeGd3 tetrahedra, corners with two equivalent O(3)CeGd3 tetrahedra,  a cornercorner with one O(8)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(10)Ce3Gd trigonal pyramid,  a cornercorner with one O(12)Ce3Gd trigonal pyramid,  an edgeedge with one O(14)CeGd3 tetrahedra,  an edgeedge with one O(13)Gd4 tetrahedra,  an edgeedge with one O(7)Ce2Gd2 trigonal pyramid,  an edgeedge with one O(10)Ce3Gd trigonal pyramid, and edges with two equivalent O(9)Ce2Gd2 trigonal pyramids. In the third O site, O(3) is bonded to one Gd(2), one Gd(3), one Gd(5), and one Ce(1) atom to form OCeGd3 tetrahedra that share  a cornercorner with one O(5)Ce2Gd2 tetrahedra,  a cornercorner with one O(1)CeGd3 tetrahedra,  a cornercorner with one O(14)CeGd3 tetrahedra,  a cornercorner with one O(3)CeGd3 tetrahedra, corners with two equivalent O(4)Ce2Gd2 tetrahedra, corners with two equivalent O(6)Ce2Gd2 tetrahedra, corners with two equivalent O(2)CeGd3 tetrahedra,  a cornercorner with one O(7)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(9)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(11)Ce3Gd trigonal pyramid,  an edgeedge with one O(14)CeGd3 tetrahedra,  an edgeedge with one O(13)Gd4 tetrahedra,  an edgeedge with one O(7)Ce2Gd2 trigonal pyramid,  an edgeedge with one O(10)Ce3Gd trigonal pyramid, and edges with two equivalent O(8)Ce2Gd2 trigonal pyramids. In the fourth O site, O(4) is bonded to one Gd(1), one Gd(3), one Ce(2), and one Ce(5) atom to form OCe2Gd2 tetrahedra that share  a cornercorner with one O(4)Ce2Gd2 tetrahedra,  a cornercorner with one O(6)Ce2Gd2 tetrahedra,  a cornercorner with one O(2)CeGd3 tetrahedra,  a cornercorner with one O(13)Gd4 tetrahedra, corners with two equivalent O(5)Ce2Gd2 tetrahedra, corners with two equivalent O(1)CeGd3 tetrahedra, corners with two equivalent O(3)CeGd3 tetrahedra,  a cornercorner with one O(8)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(10)Ce3Gd trigonal pyramid,  a cornercorner with one O(12)Ce3Gd trigonal pyramid, edges with two equivalent O(14)CeGd3 tetrahedra,  an edgeedge with one O(8)Ce2Gd2 trigonal pyramid,  an edgeedge with one O(9)Ce2Gd2 trigonal pyramid,  an edgeedge with one O(11)Ce3Gd trigonal pyramid, and  an edgeedge with one O(12)Ce3Gd trigonal pyramid. In the fifth O site, O(5) is bonded to one Gd(1), one Gd(2), one Ce(3), and one Ce(5) atom to form OCe2Gd2 tetrahedra that share  a cornercorner with one O(5)Ce2Gd2 tetrahedra,  a cornercorner with one O(1)CeGd3 tetrahedra,  a cornercorner with one O(14)CeGd3 tetrahedra,  a cornercorner with one O(3)CeGd3 tetrahedra, corners with two equivalent O(4)Ce2Gd2 tetrahedra, corners with two equivalent O(6)Ce2Gd2 tetrahedra, corners with two equivalent O(2)CeGd3 tetrahedra,  a cornercorner with one O(7)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(9)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(11)Ce3Gd trigonal pyramid,  an edgeedge with one O(14)CeGd3 tetrahedra,  an edgeedge with one O(13)Gd4 tetrahedra,  an edgeedge with one O(7)Ce2Gd2 trigonal pyramid,  an edgeedge with one O(10)Ce3Gd trigonal pyramid, and edges with two equivalent O(12)Ce3Gd trigonal pyramids. In the sixth O site, O(6) is bonded to one Gd(2), one Gd(4), one Ce(1), and one Ce(5) atom to form OCe2Gd2 tetrahedra that share  a cornercorner with one O(4)Ce2Gd2 tetrahedra,  a cornercorner with one O(6)Ce2Gd2 tetrahedra,  a cornercorner with one O(2)CeGd3 tetrahedra,  a cornercorner with one O(13)Gd4 tetrahedra, corners with two equivalent O(5)Ce2Gd2 tetrahedra, corners with two equivalent O(1)CeGd3 tetrahedra, corners with two equivalent O(3)CeGd3 tetrahedra,  a cornercorner with one O(8)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(10)Ce3Gd trigonal pyramid,  a cornercorner with one O(12)Ce3Gd trigonal pyramid,  an edgeedge with one O(14)CeGd3 tetrahedra,  an edgeedge with one O(13)Gd4 tetrahedra,  an edgeedge with one O(7)Ce2Gd2 trigonal pyramid,  an edgeedge with one O(10)Ce3Gd trigonal pyramid, and edges with two equivalent O(11)Ce3Gd trigonal pyramids. In the seventh O site, O(7) is bonded to one Gd(2), one Gd(5), one Ce(1), and one Ce(3) atom to form distorted OCe2Gd2 trigonal pyramids that share  a cornercorner with one O(5)Ce2Gd2 tetrahedra,  a cornercorner with one O(1)CeGd3 tetrahedra,  a cornercorner with one O(14)CeGd3 tetrahedra,  a cornercorner with one O(3)CeGd3 tetrahedra, corners with two equivalent O(13)Gd4 tetrahedra,  a cornercorner with one O(7)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(9)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(11)Ce3Gd trigonal pyramid, corners with two equivalent O(8)Ce2Gd2 trigonal pyramids, corners with two equivalent O(10)Ce3Gd trigonal pyramids, corners with two equivalent O(12)Ce3Gd trigonal pyramids,  an edgeedge with one O(5)Ce2Gd2 tetrahedra,  an edgeedge with one O(6)Ce2Gd2 tetrahedra,  an edgeedge with one O(2)CeGd3 tetrahedra, and  an edgeedge with one O(3)CeGd3 tetrahedra. In the eighth O site, O(8) is bonded to one Gd(3), one Gd(5), one Ce(1), and one Ce(2) atom to form distorted OCe2Gd2 trigonal pyramids that share  a cornercorner with one O(4)Ce2Gd2 tetrahedra,  a cornercorner with one O(6)Ce2Gd2 tetrahedra,  a cornercorner with one O(2)CeGd3 tetrahedra,  a cornercorner with one O(13)Gd4 tetrahedra, corners with two equivalent O(14)CeGd3 tetrahedra,  a cornercorner with one O(8)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(10)Ce3Gd trigonal pyramid,  a cornercorner with one O(12)Ce3Gd trigonal pyramid, corners with two equivalent O(7)Ce2Gd2 trigonal pyramids, corners with two equivalent O(9)Ce2Gd2 trigonal pyramids, corners with two equivalent O(11)Ce3Gd trigonal pyramids,  an edgeedge with one O(4)Ce2Gd2 tetrahedra,  an edgeedge with one O(1)CeGd3 tetrahedra, and edges with two equivalent O(3)CeGd3 tetrahedra. In the ninth O site, O(9) is bonded to one Gd(1), one Gd(5), one Ce(2), and one Ce(4) atom to form distorted OCe2Gd2 trigonal pyramids that share  a cornercorner with one O(5)Ce2Gd2 tetrahedra,  a cornercorner with one O(1)CeGd3 tetrahedra,  a cornercorner with one O(14)CeGd3 tetrahedra,  a cornercorner with one O(3)CeGd3 tetrahedra, corners with two equivalent O(13)Gd4 tetrahedra,  a cornercorner with one O(7)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(9)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(11)Ce3Gd trigonal pyramid, corners with two equivalent O(8)Ce2Gd2 trigonal pyramids, corners with two equivalent O(10)Ce3Gd trigonal pyramids, corners with two equivalent O(12)Ce3Gd trigonal pyramids,  an edgeedge with one O(4)Ce2Gd2 tetrahedra,  an edgeedge with one O(1)CeGd3 tetrahedra, and edges with two equivalent O(2)CeGd3 tetrahedra. In the tenth O site, O(10) is bonded to one Gd(2), one Ce(1), one Ce(4), and one Ce(5) atom to form distorted OCe3Gd trigonal pyramids that share  a cornercorner with one O(4)Ce2Gd2 tetrahedra,  a cornercorner with one O(6)Ce2Gd2 tetrahedra,  a cornercorner with one O(2)CeGd3 tetrahedra,  a cornercorner with one O(13)Gd4 tetrahedra, corners with two equivalent O(14)CeGd3 tetrahedra,  a cornercorner with one O(8)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(10)Ce3Gd trigonal pyramid,  a cornercorner with one O(12)Ce3Gd trigonal pyramid, corners with two equivalent O(7)Ce2Gd2 trigonal pyramids, corners with two equivalent O(9)Ce2Gd2 trigonal pyramids, corners with two equivalent O(11)Ce3Gd trigonal pyramids,  an edgeedge with one O(5)Ce2Gd2 tetrahedra,  an edgeedge with one O(6)Ce2Gd2 tetrahedra,  an edgeedge with one O(2)CeGd3 tetrahedra, and  an edgeedge with one O(3)CeGd3 tetrahedra. In the eleventh O site, O(11) is bonded to one Gd(4), one Ce(1), one Ce(2), and one Ce(5) atom to form distorted OCe3Gd trigonal pyramids that share  a cornercorner with one O(5)Ce2Gd2 tetrahedra,  a cornercorner with one O(1)CeGd3 tetrahedra,  a cornercorner with one O(14)CeGd3 tetrahedra,  a cornercorner with one O(3)CeGd3 tetrahedra, corners with two equivalent O(13)Gd4 tetrahedra,  a cornercorner with one O(7)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(9)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(11)Ce3Gd trigonal pyramid, corners with two equivalent O(8)Ce2Gd2 trigonal pyramids, corners with two equivalent O(10)Ce3Gd trigonal pyramids, corners with two equivalent O(12)Ce3Gd trigonal pyramids,  an edgeedge with one O(4)Ce2Gd2 tetrahedra,  an edgeedge with one O(1)CeGd3 tetrahedra, and edges with two equivalent O(6)Ce2Gd2 tetrahedra. In the twelfth O site, O(12) is bonded to one Gd(1), one Ce(2), one Ce(3), and one Ce(5) atom to form distorted OCe3Gd trigonal pyramids that share  a cornercorner with one O(4)Ce2Gd2 tetrahedra,  a cornercorner with one O(6)Ce2Gd2 tetrahedra,  a cornercorner with one O(2)CeGd3 tetrahedra,  a cornercorner with one O(13)Gd4 tetrahedra, corners with two equivalent O(14)CeGd3 tetrahedra,  a cornercorner with one O(8)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(10)Ce3Gd trigonal pyramid,  a cornercorner with one O(12)Ce3Gd trigonal pyramid, corners with two equivalent O(7)Ce2Gd2 trigonal pyramids, corners with two equivalent O(9)Ce2Gd2 trigonal pyramids, corners with two equivalent O(11)Ce3Gd trigonal pyramids,  an edgeedge with one O(4)Ce2Gd2 tetrahedra,  an edgeedge with one O(1)CeGd3 tetrahedra, and edges with two equivalent O(5)Ce2Gd2 tetrahedra. In the thirteenth O site, O(13) is bonded to one Gd(1), one Gd(2), one Gd(4), and one Gd(5) atom to form OGd4 tetrahedra that share  a cornercorner with one O(4)Ce2Gd2 tetrahedra,  a cornercorner with one O(6)Ce2Gd2 tetrahedra,  a cornercorner with one O(2)CeGd3 tetrahedra,  a cornercorner with one O(13)Gd4 tetrahedra, corners with two equivalent O(14)CeGd3 tetrahedra,  a cornercorner with one O(8)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(10)Ce3Gd trigonal pyramid,  a cornercorner with one O(12)Ce3Gd trigonal pyramid, corners with two equivalent O(7)Ce2Gd2 trigonal pyramids, corners with two equivalent O(9)Ce2Gd2 trigonal pyramids, corners with two equivalent O(11)Ce3Gd trigonal pyramids,  an edgeedge with one O(5)Ce2Gd2 tetrahedra,  an edgeedge with one O(6)Ce2Gd2 tetrahedra,  an edgeedge with one O(2)CeGd3 tetrahedra,  an edgeedge with one O(3)CeGd3 tetrahedra, and edges with two equivalent O(1)CeGd3 tetrahedra. In the fourteenth O site, O(14) is bonded to one Gd(1), one Gd(2), one Gd(3), and one Ce(5) atom to form OCeGd3 tetrahedra that share  a cornercorner with one O(5)Ce2Gd2 tetrahedra,  a cornercorner with one O(1)CeGd3 tetrahedra,  a cornercorner with one O(14)CeGd3 tetrahedra,  a cornercorner with one O(3)CeGd3 tetrahedra, corners with two equivalent O(13)Gd4 tetrahedra,  a cornercorner with one O(7)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(9)Ce2Gd2 trigonal pyramid,  a cornercorner with one O(11)Ce3Gd trigonal pyramid, corners with two equivalent O(8)Ce2Gd2 trigonal pyramids, corners with two equivalent O(10)Ce3Gd trigonal pyramids, corners with two equivalent O(12)Ce3Gd trigonal pyramids,  an edgeedge with one O(5)Ce2Gd2 tetrahedra,  an edgeedge with one O(6)Ce2Gd2 tetrahedra,  an edgeedge with one O(2)CeGd3 tetrahedra,  an edgeedge with one O(3)CeGd3 tetrahedra, and edges with two equivalent O(4)Ce2Gd2 tetrahedra. is represented by the CIF card [CIF]
data_Ce2Gd2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.539
_cell_length_b   9.539
_cell_length_c   11.026
_cell_angle_alpha   54.813
_cell_angle_beta   54.813
_cell_angle_gamma   70.601
_symmetry_Int_Tables_number   1
_cell_volume   670.163
_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
  Ce  Ce0  1  0.747  0.751  0.228  1.0
  Ce  Ce1  1  0.024  0.522  0.476  1.0
  Ce  Ce2  1  0.772  0.228  0.500  1.0
  Ce  Ce3  1  0.249  0.253  0.772  1.0
  Ce  Ce4  1  0.478  0.976  0.524  1.0
  Ce  Ce5  1  0.726  0.274  0.000  1.0
  Ce  Ce6  1  0.025  1.000  0.250  1.0
  Ce  Ce7  1  0.000  0.975  0.750  1.0
  Gd  Gd8  1  0.746  0.749  0.754  1.0
  Gd  Gd9  1  0.500  0.999  0.001  1.0
  Gd  Gd10  1  0.252  0.748  0.500  1.0
  Gd  Gd11  1  0.251  0.254  0.246  1.0
  Gd  Gd12  1  0.001  0.500  0.999  1.0
  Gd  Gd13  1  0.253  0.747  0.000  1.0
  Gd  Gd14  1  0.476  0.499  0.774  1.0
  Gd  Gd15  1  0.501  0.524  0.226  1.0
  O  O16  1  0.492  0.749  0.750  1.0
  O  O17  1  0.498  0.258  0.001  1.0
  O  O18  1  0.249  0.494  0.758  1.0
  O  O19  1  0.251  0.508  0.250  1.0
  O  O20  1  0.742  0.502  0.999  1.0
  O  O21  1  0.506  0.751  0.242  1.0
  O  O22  1  0.010  0.757  0.487  1.0
  O  O23  1  0.003  0.238  0.255  1.0
  O  O24  1  0.246  0.007  0.007  1.0
  O  O25  1  0.243  0.990  0.513  1.0
  O  O26  1  0.762  0.997  0.745  1.0
  O  O27  1  0.993  0.754  0.993  1.0
  O  O28  1  0.519  0.263  0.710  1.0
  O  O29  1  0.538  0.757  0.475  1.0
  O  O30  1  0.777  0.480  0.729  1.0
  O  O31  1  0.737  0.481  0.290  1.0
  O  O32  1  0.243  0.462  0.525  1.0
  O  O33  1  0.520  0.223  0.271  1.0
  O  O34  1  0.982  0.232  0.998  1.0
  O  O35  1  0.960  0.748  0.270  1.0
  O  O36  1  0.731  0.021  0.483  1.0
  O  O37  1  0.768  0.018  0.002  1.0
  O  O38  1  0.252  0.040  0.730  1.0
  O  O39  1  0.979  0.269  0.517  1.0
  O  O40  1  0.240  0.500  0.009  1.0
  O  O41  1  0.500  0.760  0.991  1.0
  O  O42  1  0.254  1.000  0.251  1.0
  O  O43  1  0.000  0.746  0.749  1.0
[/CIF]
.