The material structure described by Ca2Bi2O5 crystallizes in the triclinic P-1 space group. There are six inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(12), one O(14), one O(15), one O(8), and two equivalent O(6) atoms to form a mixture of distorted corner and edge-sharing CaO6 octahedra. The corner-sharing octahedral tilt angles are 27°. In the second Ca site, Ca(2) is bonded in a 6-coordinate geometry to one O(3), one O(5), one O(7), one O(8), and two equivalent O(10) atoms. In the third Ca site, Ca(3) is bonded to one O(11), one O(12), one O(3), one O(6), and two equivalent O(13) atoms to form a mixture of distorted corner and edge-sharing CaO6 octahedra. The corner-sharing octahedral tilt angles range from 4-27°. In the fourth Ca site, Ca(4) is bonded to one O(12), one O(15), one O(2), one O(9), and two equivalent O(11) atoms to form a mixture of distorted corner and edge-sharing CaO6 octahedra. The corner-sharing octahedral tilt angles are 4°. In the fifth Ca site, Ca(5) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(14), one O(2), one O(7), and one O(9) atom. In the sixth Ca site, Ca(6) is bonded in a 6-coordinate geometry to one O(3), one O(4), one O(5), one O(9), and two equivalent O(7) atoms. There are six inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(14), one O(4), and one O(7) atom. In the second Bi site, Bi(2) is bonded in a rectangular see-saw-like geometry to one O(1), one O(10), one O(2), and one O(8) atom. In the third Bi site, Bi(3) is bonded in a 4-coordinate geometry to one O(12), one O(13), one O(3), and one O(4) atom. In the fourth Bi site, Bi(4) is bonded in a distorted T-shaped geometry to one O(11), one O(13), and one O(9) atom. In the fifth Bi site, Bi(5) is bonded in a distorted see-saw-like geometry to one O(2), one O(4), one O(5), and one O(8) atom. In the sixth Bi site, Bi(6) is bonded in a rectangular see-saw-like geometry to one O(14), one O(15), one O(5), and one O(6) atom. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Bi(1) and one Bi(2) atom. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to one Ca(4), one Ca(5), one Bi(2), and one Bi(5) atom. In the third O site, O(3) is bonded to one Ca(2), one Ca(3), one Ca(6), and one Bi(3) atom to form distorted OCa3Bi trigonal pyramids that share corners with two equivalent O(12)Ca3Bi tetrahedra,  a cornercorner with one O(11)Ca4Bi trigonal bipyramid,  a cornercorner with one O(7)Ca4Bi trigonal bipyramid,  a cornercorner with one O(8)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(6)Ca3Bi trigonal pyramid,  a cornercorner with one O(9)Ca3Bi trigonal pyramid, corners with two equivalent O(10)Ca3Bi trigonal pyramids,  an edgeedge with one O(4)CaBi3 tetrahedra,  an edgeedge with one O(7)Ca4Bi trigonal bipyramid, and  an edgeedge with one O(5)Ca2Bi2 trigonal pyramid. In the fourth O site, O(4) is bonded to one Ca(6), one Bi(1), one Bi(3), and one Bi(5) atom to form distorted OCaBi3 tetrahedra that share  a cornercorner with one O(14)Ca2Bi2 tetrahedra,  a cornercorner with one O(12)Ca3Bi tetrahedra,  a cornercorner with one O(7)Ca4Bi trigonal bipyramid,  a cornercorner with one O(8)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(9)Ca3Bi trigonal pyramid, corners with two equivalent O(5)Ca2Bi2 trigonal pyramids,  an edgeedge with one O(7)Ca4Bi trigonal bipyramid, and  an edgeedge with one O(3)Ca3Bi trigonal pyramid. In the fifth O site, O(5) is bonded to one Ca(2), one Ca(6), one Bi(5), and one Bi(6) atom to form distorted OCa2Bi2 trigonal pyramids that share  a cornercorner with one O(14)Ca2Bi2 tetrahedra, corners with two equivalent O(4)CaBi3 tetrahedra,  a cornercorner with one O(7)Ca4Bi trigonal bipyramid,  a cornercorner with one O(6)Ca3Bi trigonal pyramid,  a cornercorner with one O(9)Ca3Bi trigonal pyramid, corners with two equivalent O(10)Ca3Bi trigonal pyramids,  an edgeedge with one O(7)Ca4Bi trigonal bipyramid,  an edgeedge with one O(8)Ca2Bi2 trigonal pyramid, and  an edgeedge with one O(3)Ca3Bi trigonal pyramid. In the sixth O site, O(6) is bonded to one Ca(3), two equivalent Ca(1), and one Bi(6) atom to form distorted OCa3Bi trigonal pyramids that share  a cornercorner with one O(14)Ca2Bi2 tetrahedra,  a cornercorner with one O(12)Ca3Bi tetrahedra,  a cornercorner with one O(11)Ca4Bi trigonal bipyramid,  a cornercorner with one O(5)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(3)Ca3Bi trigonal pyramid, corners with two equivalent O(8)Ca2Bi2 trigonal pyramids,  an edgeedge with one O(14)Ca2Bi2 tetrahedra,  an edgeedge with one O(12)Ca3Bi tetrahedra, and  an edgeedge with one O(6)Ca3Bi trigonal pyramid. In the seventh O site, O(7) is bonded to one Ca(2), one Ca(5), two equivalent Ca(6), and one Bi(1) atom to form distorted OCa4Bi trigonal bipyramids that share  a cornercorner with one O(4)CaBi3 tetrahedra,  a cornercorner with one O(11)Ca4Bi trigonal bipyramid,  a cornercorner with one O(5)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(8)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(10)Ca3Bi trigonal pyramid,  a cornercorner with one O(3)Ca3Bi trigonal pyramid,  a cornercorner with one O(9)Ca3Bi trigonal pyramid,  an edgeedge with one O(14)Ca2Bi2 tetrahedra,  an edgeedge with one O(4)CaBi3 tetrahedra,  an edgeedge with one O(7)Ca4Bi trigonal bipyramid,  an edgeedge with one O(5)Ca2Bi2 trigonal pyramid,  an edgeedge with one O(10)Ca3Bi trigonal pyramid,  an edgeedge with one O(3)Ca3Bi trigonal pyramid, and  an edgeedge with one O(9)Ca3Bi trigonal pyramid. In the eighth O site, O(8) is bonded to one Ca(1), one Ca(2), one Bi(2), and one Bi(5) atom to form distorted OCa2Bi2 trigonal pyramids that share  a cornercorner with one O(14)Ca2Bi2 tetrahedra,  a cornercorner with one O(12)Ca3Bi tetrahedra,  a cornercorner with one O(4)CaBi3 tetrahedra,  a cornercorner with one O(7)Ca4Bi trigonal bipyramid,  a cornercorner with one O(10)Ca3Bi trigonal pyramid,  a cornercorner with one O(3)Ca3Bi trigonal pyramid, corners with two equivalent O(6)Ca3Bi trigonal pyramids,  an edgeedge with one O(5)Ca2Bi2 trigonal pyramid, and  an edgeedge with one O(10)Ca3Bi trigonal pyramid. In the ninth O site, O(9) is bonded to one Ca(4), one Ca(5), one Ca(6), and one Bi(4) atom to form OCa3Bi trigonal pyramids that share  a cornercorner with one O(14)Ca2Bi2 tetrahedra,  a cornercorner with one O(12)Ca3Bi tetrahedra,  a cornercorner with one O(4)CaBi3 tetrahedra,  a cornercorner with one O(7)Ca4Bi trigonal bipyramid,  a cornercorner with one O(5)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(10)Ca3Bi trigonal pyramid,  a cornercorner with one O(3)Ca3Bi trigonal pyramid,  an edgeedge with one O(7)Ca4Bi trigonal bipyramid, and edges with two equivalent O(11)Ca4Bi trigonal bipyramids. In the tenth O site, O(10) is bonded to one Ca(5), two equivalent Ca(2), and one Bi(2) atom to form distorted OCa3Bi trigonal pyramids that share  a cornercorner with one O(14)Ca2Bi2 tetrahedra,  a cornercorner with one O(11)Ca4Bi trigonal bipyramid,  a cornercorner with one O(7)Ca4Bi trigonal bipyramid,  a cornercorner with one O(8)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(9)Ca3Bi trigonal pyramid, corners with two equivalent O(5)Ca2Bi2 trigonal pyramids, corners with two equivalent O(3)Ca3Bi trigonal pyramids,  an edgeedge with one O(7)Ca4Bi trigonal bipyramid,  an edgeedge with one O(8)Ca2Bi2 trigonal pyramid, and  an edgeedge with one O(10)Ca3Bi trigonal pyramid. In the eleventh O site, O(11) is bonded to one Ca(3), one Ca(5), two equivalent Ca(4), and one Bi(4) atom to form distorted OCa4Bi trigonal bipyramids that share  a cornercorner with one O(14)Ca2Bi2 tetrahedra,  a cornercorner with one O(12)Ca3Bi tetrahedra,  a cornercorner with one O(7)Ca4Bi trigonal bipyramid,  a cornercorner with one O(10)Ca3Bi trigonal pyramid,  a cornercorner with one O(3)Ca3Bi trigonal pyramid,  a cornercorner with one O(6)Ca3Bi trigonal pyramid,  an edgeedge with one O(12)Ca3Bi tetrahedra,  an edgeedge with one O(11)Ca4Bi trigonal bipyramid, and edges with two equivalent O(9)Ca3Bi trigonal pyramids. In the twelfth O site, O(12) is bonded to one Ca(1), one Ca(3), one Ca(4), and one Bi(3) atom to form OCa3Bi tetrahedra that share  a cornercorner with one O(14)Ca2Bi2 tetrahedra,  a cornercorner with one O(4)CaBi3 tetrahedra,  a cornercorner with one O(11)Ca4Bi trigonal bipyramid,  a cornercorner with one O(8)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(6)Ca3Bi trigonal pyramid,  a cornercorner with one O(9)Ca3Bi trigonal pyramid, corners with two equivalent O(3)Ca3Bi trigonal pyramids,  an edgeedge with one O(11)Ca4Bi trigonal bipyramid, and  an edgeedge with one O(6)Ca3Bi trigonal pyramid. In the thirteenth O site, O(13) is bonded in a rectangular see-saw-like geometry to two equivalent Ca(3), one Bi(3), and one Bi(4) atom. In the fourteenth O site, O(14) is bonded to one Ca(1), one Ca(5), one Bi(1), and one Bi(6) atom to form OCa2Bi2 tetrahedra that share  a cornercorner with one O(12)Ca3Bi tetrahedra,  a cornercorner with one O(4)CaBi3 tetrahedra,  a cornercorner with one O(11)Ca4Bi trigonal bipyramid,  a cornercorner with one O(5)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(8)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(10)Ca3Bi trigonal pyramid,  a cornercorner with one O(6)Ca3Bi trigonal pyramid,  a cornercorner with one O(9)Ca3Bi trigonal pyramid,  an edgeedge with one O(7)Ca4Bi trigonal bipyramid, and  an edgeedge with one O(6)Ca3Bi trigonal pyramid. In the fifteenth O site, O(15) is bonded in a distorted T-shaped geometry to one Ca(1), one Ca(4), and one Bi(6) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ca2Bi2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.236
_cell_length_b   10.284
_cell_length_c   10.663
_cell_angle_alpha   107.273
_cell_angle_beta   116.963
_cell_angle_gamma   93.728
_symmetry_Int_Tables_number   1
_cell_volume   928.653
_cell_formula_units_Z   6
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Ca  Ca0  1  0.429  0.832  0.840  1.0
  Ca  Ca1  1  0.571  0.168  0.160  1.0
  Ca  Ca2  1  0.346  0.593  0.024  1.0
  Ca  Ca3  1  0.654  0.407  0.976  1.0
  Ca  Ca4  1  0.521  0.942  0.338  1.0
  Ca  Ca5  1  0.479  0.058  0.662  1.0
  Ca  Ca6  1  0.893  0.152  0.484  1.0
  Ca  Ca7  1  0.107  0.848  0.516  1.0
  Ca  Ca8  1  0.798  0.785  0.183  1.0
  Ca  Ca9  1  0.202  0.215  0.817  1.0
  Ca  Ca10  1  0.898  0.340  0.854  1.0
  Ca  Ca11  1  0.102  0.660  0.146  1.0
  Bi  Bi12  1  0.751  0.664  0.821  1.0
  Bi  Bi13  1  0.249  0.336  0.179  1.0
  Bi  Bi14  1  0.693  0.575  0.333  1.0
  Bi  Bi15  1  0.307  0.425  0.667  1.0
  Bi  Bi16  1  0.574  0.312  0.534  1.0
  Bi  Bi17  1  0.426  0.688  0.466  1.0
  Bi  Bi18  1  0.850  0.924  0.647  1.0
  Bi  Bi19  1  0.150  0.076  0.353  1.0
  Bi  Bi20  1  0.978  0.427  0.304  1.0
  Bi  Bi21  1  0.022  0.573  0.696  1.0
  Bi  Bi22  1  0.794  0.059  0.013  1.0
  Bi  Bi23  1  0.206  0.941  0.987  1.0
  O  O24  1  0.522  0.556  0.705  1.0
  O  O25  1  0.478  0.444  0.295  1.0
  O  O26  1  0.930  0.633  0.348  1.0
  O  O27  1  0.070  0.367  0.652  1.0
  O  O28  1  0.637  0.268  0.739  1.0
  O  O29  1  0.363  0.732  0.261  1.0
  O  O30  1  0.807  0.461  0.682  1.0
  O  O31  1  0.193  0.539  0.318  1.0
  O  O32  1  0.896  0.323  0.069  1.0
  O  O33  1  0.104  0.677  0.931  1.0
  O  O34  1  0.571  0.085  0.923  1.0
  O  O35  1  0.429  0.915  0.077  1.0
  O  O36  1  0.831  0.588  0.999  1.0
  O  O37  1  0.169  0.412  0.001  1.0
  O  O38  1  0.720  0.381  0.216  1.0
  O  O39  1  0.280  0.619  0.784  1.0
  O  O40  1  0.942  0.139  0.726  1.0
  O  O41  1  0.058  0.861  0.274  1.0
  O  O42  1  0.603  0.621  0.137  1.0
  O  O43  1  0.397  0.379  0.863  1.0
  O  O44  1  0.826  0.903  0.432  1.0
  O  O45  1  0.174  0.097  0.568  1.0
  O  O46  1  0.652  0.170  0.405  1.0
  O  O47  1  0.348  0.830  0.595  1.0
  O  O48  1  0.382  0.080  0.423  1.0
  O  O49  1  0.618  0.920  0.577  1.0
  O  O50  1  0.307  0.162  0.036  1.0
  O  O51  1  0.693  0.838  0.964  1.0
  O  O52  1  0.167  0.892  0.765  1.0
  O  O53  1  0.833  0.108  0.235  1.0
[/CIF]
.
The material structure described by Ca2Bi2O5 crystallizes in the triclinic P-1 space group. There are six inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(12), one O(14), one O(15), one O(8), and two equivalent O(6) atoms to form a mixture of distorted corner and edge-sharing CaO6 octahedra. The corner-sharing octahedral tilt angles are 27°. In the second Ca site, Ca(2) is bonded in a 6-coordinate geometry to one O(3), one O(5), one O(7), one O(8), and two equivalent O(10) atoms. In the third Ca site, Ca(3) is bonded to one O(11), one O(12), one O(3), one O(6), and two equivalent O(13) atoms to form a mixture of distorted corner and edge-sharing CaO6 octahedra. The corner-sharing octahedral tilt angles range from 4-27°. In the fourth Ca site, Ca(4) is bonded to one O(12), one O(15), one O(2), one O(9), and two equivalent O(11) atoms to form a mixture of distorted corner and edge-sharing CaO6 octahedra. The corner-sharing octahedral tilt angles are 4°. In the fifth Ca site, Ca(5) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(14), one O(2), one O(7), and one O(9) atom. In the sixth Ca site, Ca(6) is bonded in a 6-coordinate geometry to one O(3), one O(4), one O(5), one O(9), and two equivalent O(7) atoms. There are six inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(14), one O(4), and one O(7) atom. In the second Bi site, Bi(2) is bonded in a rectangular see-saw-like geometry to one O(1), one O(10), one O(2), and one O(8) atom. In the third Bi site, Bi(3) is bonded in a 4-coordinate geometry to one O(12), one O(13), one O(3), and one O(4) atom. In the fourth Bi site, Bi(4) is bonded in a distorted T-shaped geometry to one O(11), one O(13), and one O(9) atom. In the fifth Bi site, Bi(5) is bonded in a distorted see-saw-like geometry to one O(2), one O(4), one O(5), and one O(8) atom. In the sixth Bi site, Bi(6) is bonded in a rectangular see-saw-like geometry to one O(14), one O(15), one O(5), and one O(6) atom. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Bi(1) and one Bi(2) atom. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to one Ca(4), one Ca(5), one Bi(2), and one Bi(5) atom. In the third O site, O(3) is bonded to one Ca(2), one Ca(3), one Ca(6), and one Bi(3) atom to form distorted OCa3Bi trigonal pyramids that share corners with two equivalent O(12)Ca3Bi tetrahedra,  a cornercorner with one O(11)Ca4Bi trigonal bipyramid,  a cornercorner with one O(7)Ca4Bi trigonal bipyramid,  a cornercorner with one O(8)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(6)Ca3Bi trigonal pyramid,  a cornercorner with one O(9)Ca3Bi trigonal pyramid, corners with two equivalent O(10)Ca3Bi trigonal pyramids,  an edgeedge with one O(4)CaBi3 tetrahedra,  an edgeedge with one O(7)Ca4Bi trigonal bipyramid, and  an edgeedge with one O(5)Ca2Bi2 trigonal pyramid. In the fourth O site, O(4) is bonded to one Ca(6), one Bi(1), one Bi(3), and one Bi(5) atom to form distorted OCaBi3 tetrahedra that share  a cornercorner with one O(14)Ca2Bi2 tetrahedra,  a cornercorner with one O(12)Ca3Bi tetrahedra,  a cornercorner with one O(7)Ca4Bi trigonal bipyramid,  a cornercorner with one O(8)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(9)Ca3Bi trigonal pyramid, corners with two equivalent O(5)Ca2Bi2 trigonal pyramids,  an edgeedge with one O(7)Ca4Bi trigonal bipyramid, and  an edgeedge with one O(3)Ca3Bi trigonal pyramid. In the fifth O site, O(5) is bonded to one Ca(2), one Ca(6), one Bi(5), and one Bi(6) atom to form distorted OCa2Bi2 trigonal pyramids that share  a cornercorner with one O(14)Ca2Bi2 tetrahedra, corners with two equivalent O(4)CaBi3 tetrahedra,  a cornercorner with one O(7)Ca4Bi trigonal bipyramid,  a cornercorner with one O(6)Ca3Bi trigonal pyramid,  a cornercorner with one O(9)Ca3Bi trigonal pyramid, corners with two equivalent O(10)Ca3Bi trigonal pyramids,  an edgeedge with one O(7)Ca4Bi trigonal bipyramid,  an edgeedge with one O(8)Ca2Bi2 trigonal pyramid, and  an edgeedge with one O(3)Ca3Bi trigonal pyramid. In the sixth O site, O(6) is bonded to one Ca(3), two equivalent Ca(1), and one Bi(6) atom to form distorted OCa3Bi trigonal pyramids that share  a cornercorner with one O(14)Ca2Bi2 tetrahedra,  a cornercorner with one O(12)Ca3Bi tetrahedra,  a cornercorner with one O(11)Ca4Bi trigonal bipyramid,  a cornercorner with one O(5)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(3)Ca3Bi trigonal pyramid, corners with two equivalent O(8)Ca2Bi2 trigonal pyramids,  an edgeedge with one O(14)Ca2Bi2 tetrahedra,  an edgeedge with one O(12)Ca3Bi tetrahedra, and  an edgeedge with one O(6)Ca3Bi trigonal pyramid. In the seventh O site, O(7) is bonded to one Ca(2), one Ca(5), two equivalent Ca(6), and one Bi(1) atom to form distorted OCa4Bi trigonal bipyramids that share  a cornercorner with one O(4)CaBi3 tetrahedra,  a cornercorner with one O(11)Ca4Bi trigonal bipyramid,  a cornercorner with one O(5)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(8)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(10)Ca3Bi trigonal pyramid,  a cornercorner with one O(3)Ca3Bi trigonal pyramid,  a cornercorner with one O(9)Ca3Bi trigonal pyramid,  an edgeedge with one O(14)Ca2Bi2 tetrahedra,  an edgeedge with one O(4)CaBi3 tetrahedra,  an edgeedge with one O(7)Ca4Bi trigonal bipyramid,  an edgeedge with one O(5)Ca2Bi2 trigonal pyramid,  an edgeedge with one O(10)Ca3Bi trigonal pyramid,  an edgeedge with one O(3)Ca3Bi trigonal pyramid, and  an edgeedge with one O(9)Ca3Bi trigonal pyramid. In the eighth O site, O(8) is bonded to one Ca(1), one Ca(2), one Bi(2), and one Bi(5) atom to form distorted OCa2Bi2 trigonal pyramids that share  a cornercorner with one O(14)Ca2Bi2 tetrahedra,  a cornercorner with one O(12)Ca3Bi tetrahedra,  a cornercorner with one O(4)CaBi3 tetrahedra,  a cornercorner with one O(7)Ca4Bi trigonal bipyramid,  a cornercorner with one O(10)Ca3Bi trigonal pyramid,  a cornercorner with one O(3)Ca3Bi trigonal pyramid, corners with two equivalent O(6)Ca3Bi trigonal pyramids,  an edgeedge with one O(5)Ca2Bi2 trigonal pyramid, and  an edgeedge with one O(10)Ca3Bi trigonal pyramid. In the ninth O site, O(9) is bonded to one Ca(4), one Ca(5), one Ca(6), and one Bi(4) atom to form OCa3Bi trigonal pyramids that share  a cornercorner with one O(14)Ca2Bi2 tetrahedra,  a cornercorner with one O(12)Ca3Bi tetrahedra,  a cornercorner with one O(4)CaBi3 tetrahedra,  a cornercorner with one O(7)Ca4Bi trigonal bipyramid,  a cornercorner with one O(5)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(10)Ca3Bi trigonal pyramid,  a cornercorner with one O(3)Ca3Bi trigonal pyramid,  an edgeedge with one O(7)Ca4Bi trigonal bipyramid, and edges with two equivalent O(11)Ca4Bi trigonal bipyramids. In the tenth O site, O(10) is bonded to one Ca(5), two equivalent Ca(2), and one Bi(2) atom to form distorted OCa3Bi trigonal pyramids that share  a cornercorner with one O(14)Ca2Bi2 tetrahedra,  a cornercorner with one O(11)Ca4Bi trigonal bipyramid,  a cornercorner with one O(7)Ca4Bi trigonal bipyramid,  a cornercorner with one O(8)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(9)Ca3Bi trigonal pyramid, corners with two equivalent O(5)Ca2Bi2 trigonal pyramids, corners with two equivalent O(3)Ca3Bi trigonal pyramids,  an edgeedge with one O(7)Ca4Bi trigonal bipyramid,  an edgeedge with one O(8)Ca2Bi2 trigonal pyramid, and  an edgeedge with one O(10)Ca3Bi trigonal pyramid. In the eleventh O site, O(11) is bonded to one Ca(3), one Ca(5), two equivalent Ca(4), and one Bi(4) atom to form distorted OCa4Bi trigonal bipyramids that share  a cornercorner with one O(14)Ca2Bi2 tetrahedra,  a cornercorner with one O(12)Ca3Bi tetrahedra,  a cornercorner with one O(7)Ca4Bi trigonal bipyramid,  a cornercorner with one O(10)Ca3Bi trigonal pyramid,  a cornercorner with one O(3)Ca3Bi trigonal pyramid,  a cornercorner with one O(6)Ca3Bi trigonal pyramid,  an edgeedge with one O(12)Ca3Bi tetrahedra,  an edgeedge with one O(11)Ca4Bi trigonal bipyramid, and edges with two equivalent O(9)Ca3Bi trigonal pyramids. In the twelfth O site, O(12) is bonded to one Ca(1), one Ca(3), one Ca(4), and one Bi(3) atom to form OCa3Bi tetrahedra that share  a cornercorner with one O(14)Ca2Bi2 tetrahedra,  a cornercorner with one O(4)CaBi3 tetrahedra,  a cornercorner with one O(11)Ca4Bi trigonal bipyramid,  a cornercorner with one O(8)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(6)Ca3Bi trigonal pyramid,  a cornercorner with one O(9)Ca3Bi trigonal pyramid, corners with two equivalent O(3)Ca3Bi trigonal pyramids,  an edgeedge with one O(11)Ca4Bi trigonal bipyramid, and  an edgeedge with one O(6)Ca3Bi trigonal pyramid. In the thirteenth O site, O(13) is bonded in a rectangular see-saw-like geometry to two equivalent Ca(3), one Bi(3), and one Bi(4) atom. In the fourteenth O site, O(14) is bonded to one Ca(1), one Ca(5), one Bi(1), and one Bi(6) atom to form OCa2Bi2 tetrahedra that share  a cornercorner with one O(12)Ca3Bi tetrahedra,  a cornercorner with one O(4)CaBi3 tetrahedra,  a cornercorner with one O(11)Ca4Bi trigonal bipyramid,  a cornercorner with one O(5)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(8)Ca2Bi2 trigonal pyramid,  a cornercorner with one O(10)Ca3Bi trigonal pyramid,  a cornercorner with one O(6)Ca3Bi trigonal pyramid,  a cornercorner with one O(9)Ca3Bi trigonal pyramid,  an edgeedge with one O(7)Ca4Bi trigonal bipyramid, and  an edgeedge with one O(6)Ca3Bi trigonal pyramid. In the fifteenth O site, O(15) is bonded in a distorted T-shaped geometry to one Ca(1), one Ca(4), and one Bi(6) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ca2Bi2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.236
_cell_length_b   10.284
_cell_length_c   10.663
_cell_angle_alpha   107.273
_cell_angle_beta   116.963
_cell_angle_gamma   93.728
_symmetry_Int_Tables_number   1
_cell_volume   928.653
_cell_formula_units_Z   6
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Ca  Ca0  1  0.429  0.832  0.840  1.0
  Ca  Ca1  1  0.571  0.168  0.160  1.0
  Ca  Ca2  1  0.346  0.593  0.024  1.0
  Ca  Ca3  1  0.654  0.407  0.976  1.0
  Ca  Ca4  1  0.521  0.942  0.338  1.0
  Ca  Ca5  1  0.479  0.058  0.662  1.0
  Ca  Ca6  1  0.893  0.152  0.484  1.0
  Ca  Ca7  1  0.107  0.848  0.516  1.0
  Ca  Ca8  1  0.798  0.785  0.183  1.0
  Ca  Ca9  1  0.202  0.215  0.817  1.0
  Ca  Ca10  1  0.898  0.340  0.854  1.0
  Ca  Ca11  1  0.102  0.660  0.146  1.0
  Bi  Bi12  1  0.751  0.664  0.821  1.0
  Bi  Bi13  1  0.249  0.336  0.179  1.0
  Bi  Bi14  1  0.693  0.575  0.333  1.0
  Bi  Bi15  1  0.307  0.425  0.667  1.0
  Bi  Bi16  1  0.574  0.312  0.534  1.0
  Bi  Bi17  1  0.426  0.688  0.466  1.0
  Bi  Bi18  1  0.850  0.924  0.647  1.0
  Bi  Bi19  1  0.150  0.076  0.353  1.0
  Bi  Bi20  1  0.978  0.427  0.304  1.0
  Bi  Bi21  1  0.022  0.573  0.696  1.0
  Bi  Bi22  1  0.794  0.059  0.013  1.0
  Bi  Bi23  1  0.206  0.941  0.987  1.0
  O  O24  1  0.522  0.556  0.705  1.0
  O  O25  1  0.478  0.444  0.295  1.0
  O  O26  1  0.930  0.633  0.348  1.0
  O  O27  1  0.070  0.367  0.652  1.0
  O  O28  1  0.637  0.268  0.739  1.0
  O  O29  1  0.363  0.732  0.261  1.0
  O  O30  1  0.807  0.461  0.682  1.0
  O  O31  1  0.193  0.539  0.318  1.0
  O  O32  1  0.896  0.323  0.069  1.0
  O  O33  1  0.104  0.677  0.931  1.0
  O  O34  1  0.571  0.085  0.923  1.0
  O  O35  1  0.429  0.915  0.077  1.0
  O  O36  1  0.831  0.588  0.999  1.0
  O  O37  1  0.169  0.412  0.001  1.0
  O  O38  1  0.720  0.381  0.216  1.0
  O  O39  1  0.280  0.619  0.784  1.0
  O  O40  1  0.942  0.139  0.726  1.0
  O  O41  1  0.058  0.861  0.274  1.0
  O  O42  1  0.603  0.621  0.137  1.0
  O  O43  1  0.397  0.379  0.863  1.0
  O  O44  1  0.826  0.903  0.432  1.0
  O  O45  1  0.174  0.097  0.568  1.0
  O  O46  1  0.652  0.170  0.405  1.0
  O  O47  1  0.348  0.830  0.595  1.0
  O  O48  1  0.382  0.080  0.423  1.0
  O  O49  1  0.618  0.920  0.577  1.0
  O  O50  1  0.307  0.162  0.036  1.0
  O  O51  1  0.693  0.838  0.964  1.0
  O  O52  1  0.167  0.892  0.765  1.0
  O  O53  1  0.833  0.108  0.235  1.0
[/CIF]
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