The material described by La4Al6O15 crystallizes in the monoclinic C2/c space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one O(2), one O(5), one O(8), two equivalent O(3), and two equivalent O(6) atoms. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and two equivalent O(7) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form corner-sharing AlO4 tetrahedra. In the second Al site, Al(2) is bonded to one O(1), one O(3), one O(6), and one O(8) atom to form corner-sharing AlO4 tetrahedra. In the third Al site, Al(3) is bonded to one O(2), one O(4), and two equivalent O(7) atoms to form a mixture of edge and corner-sharing AlO4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(8) is bonded in a 4-coordinate geometry to two equivalent La(1) and two equivalent Al(2) atoms. In the second O site, O(1) is bonded in a 3-coordinate geometry to one La(2), one Al(1), and one Al(2) atom. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to one La(1), one La(2), one Al(1), and one Al(3) atom. In the fourth O site, O(3) is bonded in a 4-coordinate geometry to one La(2), two equivalent La(1), and one Al(2) atom. In the fifth O site, O(4) is bonded in a 3-coordinate geometry to one La(2), one Al(1), and one Al(3) atom. In the sixth O site, O(5) is bonded in a distorted trigonal planar geometry to one La(1), one La(2), and one Al(1) atom. In the seventh O site, O(6) is bonded in a 4-coordinate geometry to one La(2), two equivalent La(1), and one Al(2) atom. In the eighth O site, O(7) is bonded in a distorted L-shaped geometry to two equivalent La(2) and two equivalent Al(3) atoms. is represented by the CIF card [CIF]
data_La4Al6O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.965
_cell_length_b   6.965
_cell_length_c   21.226
_cell_angle_alpha   86.983
_cell_angle_beta   86.983
_cell_angle_gamma   42.601
_symmetry_Int_Tables_number   1
_cell_volume   695.816
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  La  La0  1  0.670  0.053  0.799  1.0
  La  La1  1  0.644  0.068  0.602  1.0
  La  La2  1  0.053  0.670  0.299  1.0
  La  La3  1  0.068  0.644  0.102  1.0
  La  La4  1  0.932  0.356  0.898  1.0
  La  La5  1  0.947  0.330  0.701  1.0
  La  La6  1  0.356  0.932  0.398  1.0
  La  La7  1  0.330  0.947  0.201  1.0
  Al  Al8  1  0.204  0.624  0.914  1.0
  Al  Al9  1  0.191  0.650  0.695  1.0
  Al  Al10  1  0.651  0.021  0.974  1.0
  Al  Al11  1  0.624  0.204  0.414  1.0
  Al  Al12  1  0.650  0.191  0.195  1.0
  Al  Al13  1  0.021  0.651  0.474  1.0
  Al  Al14  1  0.979  0.349  0.526  1.0
  Al  Al15  1  0.350  0.809  0.805  1.0
  Al  Al16  1  0.376  0.796  0.586  1.0
  Al  Al17  1  0.349  0.979  0.026  1.0
  Al  Al18  1  0.809  0.350  0.305  1.0
  Al  Al19  1  0.796  0.376  0.086  1.0
  O  O20  1  0.130  0.808  0.620  1.0
  O  O21  1  0.558  0.279  0.919  1.0
  O  O22  1  0.540  0.308  0.698  1.0
  O  O23  1  0.019  0.743  0.988  1.0
  O  O24  1  0.808  0.130  0.120  1.0
  O  O25  1  0.279  0.558  0.419  1.0
  O  O26  1  0.013  0.620  0.863  1.0
  O  O27  1  0.308  0.540  0.198  1.0
  O  O28  1  0.743  0.019  0.488  1.0
  O  O29  1  0.914  0.686  0.708  1.0
  O  O30  1  0.103  0.486  0.551  1.0
  O  O31  1  0.514  0.897  0.949  1.0
  O  O32  1  0.620  0.013  0.363  1.0
  O  O33  1  0.686  0.914  0.208  1.0
  O  O34  1  0.314  0.086  0.792  1.0
  O  O35  1  0.380  0.987  0.637  1.0
  O  O36  1  0.486  0.103  0.051  1.0
  O  O37  1  0.897  0.514  0.449  1.0
  O  O38  1  0.086  0.314  0.292  1.0
  O  O39  1  0.257  0.981  0.512  1.0
  O  O40  1  0.692  0.460  0.802  1.0
  O  O41  1  0.987  0.380  0.137  1.0
  O  O42  1  0.721  0.442  0.581  1.0
  O  O43  1  0.192  0.870  0.880  1.0
  O  O44  1  0.123  0.877  0.750  1.0
  O  O45  1  0.981  0.257  0.012  1.0
  O  O46  1  0.460  0.692  0.302  1.0
  O  O47  1  0.442  0.721  0.081  1.0
  O  O48  1  0.870  0.192  0.380  1.0
  O  O49  1  0.877  0.123  0.250  1.0
[/CIF]
.
The material described by La4Al6O15 crystallizes in the monoclinic C2/c space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one O(2), one O(5), one O(8), two equivalent O(3), and two equivalent O(6) atoms. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and two equivalent O(7) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form corner-sharing AlO4 tetrahedra. In the second Al site, Al(2) is bonded to one O(1), one O(3), one O(6), and one O(8) atom to form corner-sharing AlO4 tetrahedra. In the third Al site, Al(3) is bonded to one O(2), one O(4), and two equivalent O(7) atoms to form a mixture of edge and corner-sharing AlO4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(8) is bonded in a 4-coordinate geometry to two equivalent La(1) and two equivalent Al(2) atoms. In the second O site, O(1) is bonded in a 3-coordinate geometry to one La(2), one Al(1), and one Al(2) atom. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to one La(1), one La(2), one Al(1), and one Al(3) atom. In the fourth O site, O(3) is bonded in a 4-coordinate geometry to one La(2), two equivalent La(1), and one Al(2) atom. In the fifth O site, O(4) is bonded in a 3-coordinate geometry to one La(2), one Al(1), and one Al(3) atom. In the sixth O site, O(5) is bonded in a distorted trigonal planar geometry to one La(1), one La(2), and one Al(1) atom. In the seventh O site, O(6) is bonded in a 4-coordinate geometry to one La(2), two equivalent La(1), and one Al(2) atom. In the eighth O site, O(7) is bonded in a distorted L-shaped geometry to two equivalent La(2) and two equivalent Al(3) atoms. is represented by the CIF card [CIF]
data_La4Al6O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.965
_cell_length_b   6.965
_cell_length_c   21.226
_cell_angle_alpha   86.983
_cell_angle_beta   86.983
_cell_angle_gamma   42.601
_symmetry_Int_Tables_number   1
_cell_volume   695.816
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  La  La0  1  0.670  0.053  0.799  1.0
  La  La1  1  0.644  0.068  0.602  1.0
  La  La2  1  0.053  0.670  0.299  1.0
  La  La3  1  0.068  0.644  0.102  1.0
  La  La4  1  0.932  0.356  0.898  1.0
  La  La5  1  0.947  0.330  0.701  1.0
  La  La6  1  0.356  0.932  0.398  1.0
  La  La7  1  0.330  0.947  0.201  1.0
  Al  Al8  1  0.204  0.624  0.914  1.0
  Al  Al9  1  0.191  0.650  0.695  1.0
  Al  Al10  1  0.651  0.021  0.974  1.0
  Al  Al11  1  0.624  0.204  0.414  1.0
  Al  Al12  1  0.650  0.191  0.195  1.0
  Al  Al13  1  0.021  0.651  0.474  1.0
  Al  Al14  1  0.979  0.349  0.526  1.0
  Al  Al15  1  0.350  0.809  0.805  1.0
  Al  Al16  1  0.376  0.796  0.586  1.0
  Al  Al17  1  0.349  0.979  0.026  1.0
  Al  Al18  1  0.809  0.350  0.305  1.0
  Al  Al19  1  0.796  0.376  0.086  1.0
  O  O20  1  0.130  0.808  0.620  1.0
  O  O21  1  0.558  0.279  0.919  1.0
  O  O22  1  0.540  0.308  0.698  1.0
  O  O23  1  0.019  0.743  0.988  1.0
  O  O24  1  0.808  0.130  0.120  1.0
  O  O25  1  0.279  0.558  0.419  1.0
  O  O26  1  0.013  0.620  0.863  1.0
  O  O27  1  0.308  0.540  0.198  1.0
  O  O28  1  0.743  0.019  0.488  1.0
  O  O29  1  0.914  0.686  0.708  1.0
  O  O30  1  0.103  0.486  0.551  1.0
  O  O31  1  0.514  0.897  0.949  1.0
  O  O32  1  0.620  0.013  0.363  1.0
  O  O33  1  0.686  0.914  0.208  1.0
  O  O34  1  0.314  0.086  0.792  1.0
  O  O35  1  0.380  0.987  0.637  1.0
  O  O36  1  0.486  0.103  0.051  1.0
  O  O37  1  0.897  0.514  0.449  1.0
  O  O38  1  0.086  0.314  0.292  1.0
  O  O39  1  0.257  0.981  0.512  1.0
  O  O40  1  0.692  0.460  0.802  1.0
  O  O41  1  0.987  0.380  0.137  1.0
  O  O42  1  0.721  0.442  0.581  1.0
  O  O43  1  0.192  0.870  0.880  1.0
  O  O44  1  0.123  0.877  0.750  1.0
  O  O45  1  0.981  0.257  0.012  1.0
  O  O46  1  0.460  0.692  0.302  1.0
  O  O47  1  0.442  0.721  0.081  1.0
  O  O48  1  0.870  0.192  0.380  1.0
  O  O49  1  0.877  0.123  0.250  1.0
[/CIF]
.