The material structure described by LiAl3Si9(N7O)2 crystallizes in the triclinic P1 space group. Li(1) is bonded in a 1-coordinate geometry to one N(3), one N(5), and one N(8) atom. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one N(4), one N(8), one O(1), and one O(2) atom to form AlN2O2 tetrahedra that share  a cornercorner with one Al(2)N3O tetrahedra,  a cornercorner with one Al(3)N3O tetrahedra,  a cornercorner with one Si(1)N3O tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra,  a cornercorner with one Si(6)N4 tetrahedra,  a cornercorner with one Si(8)N4 tetrahedra, and corners with two equivalent Si(4)N3O tetrahedra. In the second Al site, Al(2) is bonded to one N(12), one N(3), one N(5), and one O(2) atom to form AlN3O tetrahedra that share  a cornercorner with one Al(1)N2O2 tetrahedra,  a cornercorner with one Si(1)N3O tetrahedra,  a cornercorner with one Si(4)N3O tetrahedra,  a cornercorner with one Si(3)N4 tetrahedra,  a cornercorner with one Si(6)N4 tetrahedra,  a cornercorner with one Si(9)N4 tetrahedra, and corners with two equivalent Si(8)N4 tetrahedra. In the third Al site, Al(3) is bonded to one N(11), one N(13), one N(14), and one O(1) atom to form AlN3O tetrahedra that share  a cornercorner with one Al(1)N2O2 tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra,  a cornercorner with one Si(5)N4 tetrahedra,  a cornercorner with one Si(7)N4 tetrahedra,  a cornercorner with one Si(8)N4 tetrahedra,  a cornercorner with one Si(9)N4 tetrahedra, and corners with two equivalent Si(1)N3O tetrahedra. There are nine inequivalent Si sites. In the first Si site, Si(1) is bonded to one N(13), one N(2), one N(3), and one O(1) atom to form SiN3O tetrahedra that share  a cornercorner with one Al(1)N2O2 tetrahedra,  a cornercorner with one Al(2)N3O tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra,  a cornercorner with one Si(3)N4 tetrahedra,  a cornercorner with one Si(7)N4 tetrahedra,  a cornercorner with one Si(9)N4 tetrahedra, and corners with two equivalent Al(3)N3O tetrahedra. In the second Si site, Si(2) is bonded to one N(14), one N(2), one N(4), and one N(6) atom to form SiN4 tetrahedra that share  a cornercorner with one Al(1)N2O2 tetrahedra,  a cornercorner with one Al(3)N3O tetrahedra,  a cornercorner with one Si(1)N3O tetrahedra,  a cornercorner with one Si(3)N4 tetrahedra,  a cornercorner with one Si(5)N4 tetrahedra,  a cornercorner with one Si(6)N4 tetrahedra, and corners with two equivalent Si(9)N4 tetrahedra. In the third Si site, Si(3) is bonded to one N(3), one N(6), one N(7), and one N(9) atom to form SiN4 tetrahedra that share  a cornercorner with one Al(2)N3O tetrahedra,  a cornercorner with one Si(1)N3O tetrahedra,  a cornercorner with one Si(4)N3O tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra,  a cornercorner with one Si(6)N4 tetrahedra,  a cornercorner with one Si(7)N4 tetrahedra, and corners with two equivalent Si(5)N4 tetrahedra. In the fourth Si site, Si(4) is bonded to one N(1), one N(7), one N(8), and one O(2) atom to form SiN3O tetrahedra that share  a cornercorner with one Al(2)N3O tetrahedra,  a cornercorner with one Si(3)N4 tetrahedra,  a cornercorner with one Si(5)N4 tetrahedra,  a cornercorner with one Si(7)N4 tetrahedra,  a cornercorner with one Si(8)N4 tetrahedra,  a cornercorner with one Si(9)N4 tetrahedra, and corners with two equivalent Al(1)N2O2 tetrahedra. In the fifth Si site, Si(5) is bonded to one N(10), one N(11), one N(6), and one N(7) atom to form SiN4 tetrahedra that share  a cornercorner with one Al(3)N3O tetrahedra,  a cornercorner with one Si(4)N3O tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra,  a cornercorner with one Si(6)N4 tetrahedra,  a cornercorner with one Si(7)N4 tetrahedra,  a cornercorner with one Si(8)N4 tetrahedra, and corners with two equivalent Si(3)N4 tetrahedra. In the sixth Si site, Si(6) is bonded to one N(10), one N(4), one N(5), and one N(9) atom to form SiN4 tetrahedra that share  a cornercorner with one Al(1)N2O2 tetrahedra,  a cornercorner with one Al(2)N3O tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra,  a cornercorner with one Si(3)N4 tetrahedra,  a cornercorner with one Si(5)N4 tetrahedra,  a cornercorner with one Si(8)N4 tetrahedra, and corners with two equivalent Si(7)N4 tetrahedra. In the seventh Si site, Si(7) is bonded to one N(1), one N(10), one N(13), and one N(9) atom to form SiN4 tetrahedra that share  a cornercorner with one Al(3)N3O tetrahedra,  a cornercorner with one Si(1)N3O tetrahedra,  a cornercorner with one Si(4)N3O tetrahedra,  a cornercorner with one Si(3)N4 tetrahedra,  a cornercorner with one Si(5)N4 tetrahedra,  a cornercorner with one Si(9)N4 tetrahedra, and corners with two equivalent Si(6)N4 tetrahedra. In the eighth Si site, Si(8) is bonded to one N(11), one N(12), one N(5), and one N(8) atom to form SiN4 tetrahedra that share  a cornercorner with one Al(1)N2O2 tetrahedra,  a cornercorner with one Al(3)N3O tetrahedra,  a cornercorner with one Si(4)N3O tetrahedra,  a cornercorner with one Si(5)N4 tetrahedra,  a cornercorner with one Si(6)N4 tetrahedra,  a cornercorner with one Si(9)N4 tetrahedra, and corners with two equivalent Al(2)N3O tetrahedra. In the ninth Si site, Si(9) is bonded to one N(1), one N(12), one N(14), and one N(2) atom to form SiN4 tetrahedra that share  a cornercorner with one Al(2)N3O tetrahedra,  a cornercorner with one Al(3)N3O tetrahedra,  a cornercorner with one Si(1)N3O tetrahedra,  a cornercorner with one Si(4)N3O tetrahedra,  a cornercorner with one Si(7)N4 tetrahedra,  a cornercorner with one Si(8)N4 tetrahedra, and corners with two equivalent Si(2)N4 tetrahedra. There are fourteen inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Si(4), one Si(7), and one Si(9) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one Si(1), one Si(2), and one Si(9) atom. In the third N site, N(3) is bonded in a tetrahedral geometry to one Li(1), one Al(2), one Si(1), and one Si(3) atom. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one Al(1), one Si(2), and one Si(6) atom. In the fifth N site, N(5) is bonded in a 4-coordinate geometry to one Li(1), one Al(2), one Si(6), and one Si(8) atom. In the sixth N site, N(6) is bonded in a trigonal planar geometry to one Si(2), one Si(3), and one Si(5) atom. In the seventh N site, N(7) is bonded in a trigonal planar geometry to one Si(3), one Si(4), and one Si(5) atom. In the eighth N site, N(8) is bonded in a 4-coordinate geometry to one Li(1), one Al(1), one Si(4), and one Si(8) atom. In the ninth N site, N(9) is bonded in a trigonal planar geometry to one Si(3), one Si(6), and one Si(7) atom. In the tenth N site, N(10) is bonded in a trigonal planar geometry to one Si(5), one Si(6), and one Si(7) atom. In the eleventh N site, N(11) is bonded in a trigonal non-coplanar geometry to one Al(3), one Si(5), and one Si(8) atom. In the twelfth N site, N(12) is bonded in a trigonal planar geometry to one Al(2), one Si(8), and one Si(9) atom. In the thirteenth N site, N(13) is bonded in a trigonal planar geometry to one Al(3), one Si(1), and one Si(7) atom. In the fourteenth N site, N(14) is bonded in a 3-coordinate geometry to one Al(3), one Si(2), and one Si(9) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Al(1), one Al(3), and one Si(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Al(1), one Al(2), and one Si(4) atom. is represented by the CIF card [CIF]
data_LiAl3Si9(N7O)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.712
_cell_length_b   7.865
_cell_length_c   7.877
_cell_angle_alpha   60.367
_cell_angle_beta   89.766
_cell_angle_gamma   89.874
_symmetry_Int_Tables_number   1
_cell_volume   307.581
_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
  Li  Li0  1  0.277  0.332  0.338  1.0
  Al  Al1  1  0.544  0.755  0.166  1.0
  Al  Al2  1  0.844  0.423  0.498  1.0
  Al  Al3  1  0.339  0.576  0.909  1.0
  Si  Si4  1  0.850  0.482  0.080  1.0
  Si  Si5  1  0.544  0.171  0.082  1.0
  Si  Si6  1  0.838  0.084  0.427  1.0
  Si  Si7  1  0.053  0.832  0.253  1.0
  Si  Si8  1  0.341  0.911  0.514  1.0
  Si  Si9  1  0.540  0.094  0.741  1.0
  Si  Si10  1  0.039  0.916  0.832  1.0
  Si  Si11  1  0.332  0.512  0.572  1.0
  Si  Si12  1  0.052  0.250  0.923  1.0
  N  N13  1  0.045  0.996  0.004  1.0
  N  N14  1  0.797  0.316  0.001  1.0
  N  N15  1  0.913  0.332  0.324  1.0
  N  N16  1  0.547  0.014  0.988  1.0
  N  N17  1  0.543  0.346  0.592  1.0
  N  N18  1  0.563  0.051  0.343  1.0
  N  N19  1  0.066  0.950  0.392  1.0
  N  N20  1  0.283  0.668  0.321  1.0
  N  N21  1  0.799  0.015  0.676  1.0
  N  N22  1  0.297  0.993  0.685  1.0
  N  N23  1  0.414  0.670  0.653  1.0
  N  N24  1  0.075  0.386  0.672  1.0
  N  N25  1  0.053  0.663  0.955  1.0
  N  N26  1  0.293  0.309  0.019  1.0
  O  O27  1  0.581  0.596  0.058  1.0
  O  O28  1  0.808  0.690  0.315  1.0
[/CIF]
.
The material structure described by LiAl3Si9(N7O)2 crystallizes in the triclinic P1 space group. Li(1) is bonded in a 1-coordinate geometry to one N(3), one N(5), and one N(8) atom. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one N(4), one N(8), one O(1), and one O(2) atom to form AlN2O2 tetrahedra that share  a cornercorner with one Al(2)N3O tetrahedra,  a cornercorner with one Al(3)N3O tetrahedra,  a cornercorner with one Si(1)N3O tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra,  a cornercorner with one Si(6)N4 tetrahedra,  a cornercorner with one Si(8)N4 tetrahedra, and corners with two equivalent Si(4)N3O tetrahedra. In the second Al site, Al(2) is bonded to one N(12), one N(3), one N(5), and one O(2) atom to form AlN3O tetrahedra that share  a cornercorner with one Al(1)N2O2 tetrahedra,  a cornercorner with one Si(1)N3O tetrahedra,  a cornercorner with one Si(4)N3O tetrahedra,  a cornercorner with one Si(3)N4 tetrahedra,  a cornercorner with one Si(6)N4 tetrahedra,  a cornercorner with one Si(9)N4 tetrahedra, and corners with two equivalent Si(8)N4 tetrahedra. In the third Al site, Al(3) is bonded to one N(11), one N(13), one N(14), and one O(1) atom to form AlN3O tetrahedra that share  a cornercorner with one Al(1)N2O2 tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra,  a cornercorner with one Si(5)N4 tetrahedra,  a cornercorner with one Si(7)N4 tetrahedra,  a cornercorner with one Si(8)N4 tetrahedra,  a cornercorner with one Si(9)N4 tetrahedra, and corners with two equivalent Si(1)N3O tetrahedra. There are nine inequivalent Si sites. In the first Si site, Si(1) is bonded to one N(13), one N(2), one N(3), and one O(1) atom to form SiN3O tetrahedra that share  a cornercorner with one Al(1)N2O2 tetrahedra,  a cornercorner with one Al(2)N3O tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra,  a cornercorner with one Si(3)N4 tetrahedra,  a cornercorner with one Si(7)N4 tetrahedra,  a cornercorner with one Si(9)N4 tetrahedra, and corners with two equivalent Al(3)N3O tetrahedra. In the second Si site, Si(2) is bonded to one N(14), one N(2), one N(4), and one N(6) atom to form SiN4 tetrahedra that share  a cornercorner with one Al(1)N2O2 tetrahedra,  a cornercorner with one Al(3)N3O tetrahedra,  a cornercorner with one Si(1)N3O tetrahedra,  a cornercorner with one Si(3)N4 tetrahedra,  a cornercorner with one Si(5)N4 tetrahedra,  a cornercorner with one Si(6)N4 tetrahedra, and corners with two equivalent Si(9)N4 tetrahedra. In the third Si site, Si(3) is bonded to one N(3), one N(6), one N(7), and one N(9) atom to form SiN4 tetrahedra that share  a cornercorner with one Al(2)N3O tetrahedra,  a cornercorner with one Si(1)N3O tetrahedra,  a cornercorner with one Si(4)N3O tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra,  a cornercorner with one Si(6)N4 tetrahedra,  a cornercorner with one Si(7)N4 tetrahedra, and corners with two equivalent Si(5)N4 tetrahedra. In the fourth Si site, Si(4) is bonded to one N(1), one N(7), one N(8), and one O(2) atom to form SiN3O tetrahedra that share  a cornercorner with one Al(2)N3O tetrahedra,  a cornercorner with one Si(3)N4 tetrahedra,  a cornercorner with one Si(5)N4 tetrahedra,  a cornercorner with one Si(7)N4 tetrahedra,  a cornercorner with one Si(8)N4 tetrahedra,  a cornercorner with one Si(9)N4 tetrahedra, and corners with two equivalent Al(1)N2O2 tetrahedra. In the fifth Si site, Si(5) is bonded to one N(10), one N(11), one N(6), and one N(7) atom to form SiN4 tetrahedra that share  a cornercorner with one Al(3)N3O tetrahedra,  a cornercorner with one Si(4)N3O tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra,  a cornercorner with one Si(6)N4 tetrahedra,  a cornercorner with one Si(7)N4 tetrahedra,  a cornercorner with one Si(8)N4 tetrahedra, and corners with two equivalent Si(3)N4 tetrahedra. In the sixth Si site, Si(6) is bonded to one N(10), one N(4), one N(5), and one N(9) atom to form SiN4 tetrahedra that share  a cornercorner with one Al(1)N2O2 tetrahedra,  a cornercorner with one Al(2)N3O tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra,  a cornercorner with one Si(3)N4 tetrahedra,  a cornercorner with one Si(5)N4 tetrahedra,  a cornercorner with one Si(8)N4 tetrahedra, and corners with two equivalent Si(7)N4 tetrahedra. In the seventh Si site, Si(7) is bonded to one N(1), one N(10), one N(13), and one N(9) atom to form SiN4 tetrahedra that share  a cornercorner with one Al(3)N3O tetrahedra,  a cornercorner with one Si(1)N3O tetrahedra,  a cornercorner with one Si(4)N3O tetrahedra,  a cornercorner with one Si(3)N4 tetrahedra,  a cornercorner with one Si(5)N4 tetrahedra,  a cornercorner with one Si(9)N4 tetrahedra, and corners with two equivalent Si(6)N4 tetrahedra. In the eighth Si site, Si(8) is bonded to one N(11), one N(12), one N(5), and one N(8) atom to form SiN4 tetrahedra that share  a cornercorner with one Al(1)N2O2 tetrahedra,  a cornercorner with one Al(3)N3O tetrahedra,  a cornercorner with one Si(4)N3O tetrahedra,  a cornercorner with one Si(5)N4 tetrahedra,  a cornercorner with one Si(6)N4 tetrahedra,  a cornercorner with one Si(9)N4 tetrahedra, and corners with two equivalent Al(2)N3O tetrahedra. In the ninth Si site, Si(9) is bonded to one N(1), one N(12), one N(14), and one N(2) atom to form SiN4 tetrahedra that share  a cornercorner with one Al(2)N3O tetrahedra,  a cornercorner with one Al(3)N3O tetrahedra,  a cornercorner with one Si(1)N3O tetrahedra,  a cornercorner with one Si(4)N3O tetrahedra,  a cornercorner with one Si(7)N4 tetrahedra,  a cornercorner with one Si(8)N4 tetrahedra, and corners with two equivalent Si(2)N4 tetrahedra. There are fourteen inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Si(4), one Si(7), and one Si(9) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one Si(1), one Si(2), and one Si(9) atom. In the third N site, N(3) is bonded in a tetrahedral geometry to one Li(1), one Al(2), one Si(1), and one Si(3) atom. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one Al(1), one Si(2), and one Si(6) atom. In the fifth N site, N(5) is bonded in a 4-coordinate geometry to one Li(1), one Al(2), one Si(6), and one Si(8) atom. In the sixth N site, N(6) is bonded in a trigonal planar geometry to one Si(2), one Si(3), and one Si(5) atom. In the seventh N site, N(7) is bonded in a trigonal planar geometry to one Si(3), one Si(4), and one Si(5) atom. In the eighth N site, N(8) is bonded in a 4-coordinate geometry to one Li(1), one Al(1), one Si(4), and one Si(8) atom. In the ninth N site, N(9) is bonded in a trigonal planar geometry to one Si(3), one Si(6), and one Si(7) atom. In the tenth N site, N(10) is bonded in a trigonal planar geometry to one Si(5), one Si(6), and one Si(7) atom. In the eleventh N site, N(11) is bonded in a trigonal non-coplanar geometry to one Al(3), one Si(5), and one Si(8) atom. In the twelfth N site, N(12) is bonded in a trigonal planar geometry to one Al(2), one Si(8), and one Si(9) atom. In the thirteenth N site, N(13) is bonded in a trigonal planar geometry to one Al(3), one Si(1), and one Si(7) atom. In the fourteenth N site, N(14) is bonded in a 3-coordinate geometry to one Al(3), one Si(2), and one Si(9) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Al(1), one Al(3), and one Si(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Al(1), one Al(2), and one Si(4) atom. is represented by the CIF card [CIF]
data_LiAl3Si9(N7O)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.712
_cell_length_b   7.865
_cell_length_c   7.877
_cell_angle_alpha   60.367
_cell_angle_beta   89.766
_cell_angle_gamma   89.874
_symmetry_Int_Tables_number   1
_cell_volume   307.581
_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
  Li  Li0  1  0.277  0.332  0.338  1.0
  Al  Al1  1  0.544  0.755  0.166  1.0
  Al  Al2  1  0.844  0.423  0.498  1.0
  Al  Al3  1  0.339  0.576  0.909  1.0
  Si  Si4  1  0.850  0.482  0.080  1.0
  Si  Si5  1  0.544  0.171  0.082  1.0
  Si  Si6  1  0.838  0.084  0.427  1.0
  Si  Si7  1  0.053  0.832  0.253  1.0
  Si  Si8  1  0.341  0.911  0.514  1.0
  Si  Si9  1  0.540  0.094  0.741  1.0
  Si  Si10  1  0.039  0.916  0.832  1.0
  Si  Si11  1  0.332  0.512  0.572  1.0
  Si  Si12  1  0.052  0.250  0.923  1.0
  N  N13  1  0.045  0.996  0.004  1.0
  N  N14  1  0.797  0.316  0.001  1.0
  N  N15  1  0.913  0.332  0.324  1.0
  N  N16  1  0.547  0.014  0.988  1.0
  N  N17  1  0.543  0.346  0.592  1.0
  N  N18  1  0.563  0.051  0.343  1.0
  N  N19  1  0.066  0.950  0.392  1.0
  N  N20  1  0.283  0.668  0.321  1.0
  N  N21  1  0.799  0.015  0.676  1.0
  N  N22  1  0.297  0.993  0.685  1.0
  N  N23  1  0.414  0.670  0.653  1.0
  N  N24  1  0.075  0.386  0.672  1.0
  N  N25  1  0.053  0.663  0.955  1.0
  N  N26  1  0.293  0.309  0.019  1.0
  O  O27  1  0.581  0.596  0.058  1.0
  O  O28  1  0.808  0.690  0.315  1.0
[/CIF]
.