The structure described by YAl2N3 crystallizes in the orthorhombic Cmc2_1 space group. Y(1) is bonded to two equivalent N(1) and three equivalent N(2) atoms to form distorted YN5 trigonal bipyramids that share corners with eight equivalent Al(1)N4 tetrahedra, corners with two equivalent Y(1)N5 trigonal bipyramids, edges with two equivalent Al(1)N4 tetrahedra, and edges with two equivalent Y(1)N5 trigonal bipyramids. Al(1) is bonded to one N(2) and three equivalent N(1) atoms to form AlN4 tetrahedra that share corners with seven equivalent Al(1)N4 tetrahedra, corners with four equivalent Y(1)N5 trigonal bipyramids, and  an edgeedge with one Y(1)N5 trigonal bipyramid. There are two inequivalent N sites. In the first N site, N(2) is bonded to three equivalent Y(1) and two equivalent Al(1) atoms to form distorted NY3Al2 trigonal bipyramids that share corners with eight equivalent N(1)YAl3 tetrahedra, corners with two equivalent N(2)Y3Al2 trigonal bipyramids, edges with two equivalent N(1)YAl3 tetrahedra, and edges with two equivalent N(2)Y3Al2 trigonal bipyramids. In the second N site, N(1) is bonded to one Y(1) and three equivalent Al(1) atoms to form NYAl3 tetrahedra that share corners with seven equivalent N(1)YAl3 tetrahedra, corners with four equivalent N(2)Y3Al2 trigonal bipyramids, and  an edgeedge with one N(2)Y3Al2 trigonal bipyramid. is represented by the Crystallographic Information File (CIF) [CIF]
data_YAl2N3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.857
_cell_length_b   5.784
_cell_length_c   5.162
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   119.586
_symmetry_Int_Tables_number   1
_cell_volume   152.065
_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
  Y  Y0  1  0.000  0.692  0.465  1.0
  Y  Y1  1  0.000  0.308  0.965  1.0
  Al  Al2  1  0.351  0.341  0.490  1.0
  Al  Al3  1  0.649  0.990  0.490  1.0
  Al  Al4  1  0.649  0.659  0.990  1.0
  Al  Al5  1  0.351  0.010  0.990  1.0
  N  N6  1  0.388  0.332  0.855  1.0
  N  N7  1  0.612  0.944  0.855  1.0
  N  N8  1  0.612  0.668  0.355  1.0
  N  N9  1  0.388  0.056  0.355  1.0
  N  N10  1  0.000  0.710  0.934  1.0
  N  N11  1  0.000  0.290  0.434  1.0
[/CIF]
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The structure described by YAl2N3 crystallizes in the orthorhombic Cmc2_1 space group. Y(1) is bonded to two equivalent N(1) and three equivalent N(2) atoms to form distorted YN5 trigonal bipyramids that share corners with eight equivalent Al(1)N4 tetrahedra, corners with two equivalent Y(1)N5 trigonal bipyramids, edges with two equivalent Al(1)N4 tetrahedra, and edges with two equivalent Y(1)N5 trigonal bipyramids. Al(1) is bonded to one N(2) and three equivalent N(1) atoms to form AlN4 tetrahedra that share corners with seven equivalent Al(1)N4 tetrahedra, corners with four equivalent Y(1)N5 trigonal bipyramids, and  an edgeedge with one Y(1)N5 trigonal bipyramid. There are two inequivalent N sites. In the first N site, N(2) is bonded to three equivalent Y(1) and two equivalent Al(1) atoms to form distorted NY3Al2 trigonal bipyramids that share corners with eight equivalent N(1)YAl3 tetrahedra, corners with two equivalent N(2)Y3Al2 trigonal bipyramids, edges with two equivalent N(1)YAl3 tetrahedra, and edges with two equivalent N(2)Y3Al2 trigonal bipyramids. In the second N site, N(1) is bonded to one Y(1) and three equivalent Al(1) atoms to form NYAl3 tetrahedra that share corners with seven equivalent N(1)YAl3 tetrahedra, corners with four equivalent N(2)Y3Al2 trigonal bipyramids, and  an edgeedge with one N(2)Y3Al2 trigonal bipyramid. is represented by the Crystallographic Information File (CIF) [CIF]
data_YAl2N3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.857
_cell_length_b   5.784
_cell_length_c   5.162
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   119.586
_symmetry_Int_Tables_number   1
_cell_volume   152.065
_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
  Y  Y0  1  0.000  0.692  0.465  1.0
  Y  Y1  1  0.000  0.308  0.965  1.0
  Al  Al2  1  0.351  0.341  0.490  1.0
  Al  Al3  1  0.649  0.990  0.490  1.0
  Al  Al4  1  0.649  0.659  0.990  1.0
  Al  Al5  1  0.351  0.010  0.990  1.0
  N  N6  1  0.388  0.332  0.855  1.0
  N  N7  1  0.612  0.944  0.855  1.0
  N  N8  1  0.612  0.668  0.355  1.0
  N  N9  1  0.388  0.056  0.355  1.0
  N  N10  1  0.000  0.710  0.934  1.0
  N  N11  1  0.000  0.290  0.434  1.0
[/CIF]
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