The material described by SrYbAl2Si2N5O2 crystallizes in the triclinic P1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to one N(6), one N(7), one N(8), two equivalent N(4), two equivalent N(9), one O(1), one O(3), and one O(4) atom. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one N(1), one N(5), one N(7), one N(8), two equivalent N(3), one O(1), one O(2), one O(3), and one O(4) atom. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded to one N(1), one N(3), one N(5), one N(7), one N(8), and one O(4) atom to form YbN5O octahedra that share  a cornercorner with one Al(1)N2O2 tetrahedra,  a cornercorner with one Al(2)N2O2 tetrahedra,  a cornercorner with one Al(3)N2O2 tetrahedra, corners with two equivalent Al(4)N3O tetrahedra, corners with two equivalent Si(3)N3O tetrahedra, corners with two equivalent Si(4)N4 tetrahedra, and corners with three equivalent Si(1)N4 tetrahedra. In the second Yb site, Yb(2) is bonded to one N(4), one N(6), one N(9), one O(1), one O(2), and one O(3) atom to form YbN3O3 octahedra that share  a cornercorner with one Al(4)N3O tetrahedra,  a cornercorner with one Si(3)N3O tetrahedra,  a cornercorner with one Si(4)N4 tetrahedra, corners with two equivalent Al(1)N2O2 tetrahedra, corners with two equivalent Al(2)N2O2 tetrahedra, corners with two equivalent Al(3)N2O2 tetrahedra, and corners with three equivalent Si(2)N4 tetrahedra. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to one N(1), one N(2), one O(1), and one O(2) atom to form AlN2O2 tetrahedra that share  a cornercorner with one Yb(1)N5O octahedra, corners with two equivalent Yb(2)N3O3 octahedra,  a cornercorner with one Si(1)N4 tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra, corners with two equivalent Al(2)N2O2 tetrahedra, and corners with two equivalent Al(3)N2O2 tetrahedra. The corner-sharing octahedral tilt angles range from 57-62°. In the second Al site, Al(2) is bonded to one N(2), one N(3), one O(1), and one O(3) atom to form AlN2O2 tetrahedra that share  a cornercorner with one Yb(1)N5O octahedra, corners with two equivalent Yb(2)N3O3 octahedra,  a cornercorner with one Si(1)N4 tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra, corners with two equivalent Al(1)N2O2 tetrahedra, and corners with two equivalent Al(3)N2O2 tetrahedra. The corner-sharing octahedral tilt angles range from 60-61°. In the third Al site, Al(3) is bonded to one N(2), one N(5), one O(2), and one O(3) atom to form AlN2O2 tetrahedra that share  a cornercorner with one Yb(1)N5O octahedra, corners with two equivalent Yb(2)N3O3 octahedra,  a cornercorner with one Si(1)N4 tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra, corners with two equivalent Al(1)N2O2 tetrahedra, and corners with two equivalent Al(2)N2O2 tetrahedra. The corner-sharing octahedral tilt angles range from 57-63°. In the fourth Al site, Al(4) is bonded to one N(10), one N(6), one N(8), and one O(4) atom to form AlN3O tetrahedra that share  a cornercorner with one Yb(2)N3O3 octahedra, corners with two equivalent Yb(1)N5O octahedra,  a cornercorner with one Si(1)N4 tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra, corners with two equivalent Si(3)N3O tetrahedra, and corners with two equivalent Si(4)N4 tetrahedra. The corner-sharing octahedral tilt angles range from 63-65°. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one N(1), one N(10), one N(3), and one N(5) atom to form SiN4 tetrahedra that share corners with three equivalent Yb(1)N5O octahedra,  a cornercorner with one Al(1)N2O2 tetrahedra,  a cornercorner with one Al(2)N2O2 tetrahedra,  a cornercorner with one Al(3)N2O2 tetrahedra,  a cornercorner with one Al(4)N3O tetrahedra,  a cornercorner with one Si(3)N3O tetrahedra, and  a cornercorner with one Si(4)N4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-56°. In the second Si site, Si(2) is bonded to one N(2), one N(4), one N(6), and one N(9) atom to form SiN4 tetrahedra that share corners with three equivalent Yb(2)N3O3 octahedra,  a cornercorner with one Al(1)N2O2 tetrahedra,  a cornercorner with one Al(2)N2O2 tetrahedra,  a cornercorner with one Al(3)N2O2 tetrahedra,  a cornercorner with one Al(4)N3O tetrahedra,  a cornercorner with one Si(3)N3O tetrahedra, and  a cornercorner with one Si(4)N4 tetrahedra. The corner-sharing octahedral tilt angles range from 54-60°. In the third Si site, Si(3) is bonded to one N(10), one N(4), one N(7), and one O(4) atom to form SiN3O tetrahedra that share  a cornercorner with one Yb(2)N3O3 octahedra, corners with two equivalent Yb(1)N5O octahedra,  a cornercorner with one Si(1)N4 tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra, corners with two equivalent Al(4)N3O tetrahedra, and corners with two equivalent Si(4)N4 tetrahedra. The corner-sharing octahedral tilt angles range from 56-60°. In the fourth Si site, Si(4) is bonded to one N(10), one N(7), one N(8), and one N(9) atom to form SiN4 tetrahedra that share  a cornercorner with one Yb(2)N3O3 octahedra, corners with two equivalent Yb(1)N5O octahedra,  a cornercorner with one Si(1)N4 tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra, corners with two equivalent Al(4)N3O tetrahedra, and corners with two equivalent Si(3)N3O tetrahedra. The corner-sharing octahedral tilt angles range from 57-60°. There are ten inequivalent N sites. In the first N site, N(1) is bonded in a 3-coordinate geometry to one Sr(2), one Yb(1), one Al(1), and one Si(1) atom. In the second N site, N(2) is bonded in a tetrahedral geometry to one Al(1), one Al(2), one Al(3), and one Si(2) atom. In the third N site, N(3) is bonded in a 3-coordinate geometry to two equivalent Sr(2), one Yb(1), one Al(2), and one Si(1) atom. In the fourth N site, N(4) is bonded in a distorted trigonal planar geometry to two equivalent Sr(1), one Yb(2), one Si(2), and one Si(3) atom. In the fifth N site, N(5) is bonded in a 4-coordinate geometry to one Sr(2), one Yb(1), one Al(3), and one Si(1) atom. In the sixth N site, N(6) is bonded in a 4-coordinate geometry to one Sr(1), one Yb(2), one Al(4), and one Si(2) atom. In the seventh N site, N(7) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Yb(1), one Si(3), and one Si(4) atom. In the eighth N site, N(8) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Yb(1), one Al(4), and one Si(4) atom. In the ninth N site, N(9) is bonded in a 3-coordinate geometry to two equivalent Sr(1), one Yb(2), one Si(2), and one Si(4) atom. In the tenth N site, N(10) is bonded in a tetrahedral geometry to one Al(4), one Si(1), one Si(3), and one Si(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), one Yb(2), one Al(1), and one Al(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Sr(2), one Yb(2), one Al(1), and one Al(3) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), one Yb(2), one Al(2), and one Al(3) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), one Yb(1), one Al(4), and one Si(3) atom. is represented by the CIF file [CIF]
data_SrYbAl2Si2N5O2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.048
_cell_length_b   6.151
_cell_length_c   10.040
_cell_angle_alpha   89.317
_cell_angle_beta   90.260
_cell_angle_gamma   119.313
_symmetry_Int_Tables_number   1
_cell_volume   325.625
_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
  Sr  Sr0  1  0.343  0.665  0.230  1.0
  Sr  Sr1  1  0.678  0.358  0.756  1.0
  Yb  Yb2  1  0.329  0.659  0.873  1.0
  Yb  Yb3  1  0.660  0.330  0.374  1.0
  Al  Al4  1  0.167  0.836  0.558  1.0
  Al  Al5  1  0.169  0.339  0.559  1.0
  Al  Al6  1  0.674  0.833  0.560  1.0
  Al  Al7  1  0.833  0.663  0.063  1.0
  Si  Si8  1  0.007  0.011  0.801  1.0
  Si  Si9  1  1.000  0.000  0.297  1.0
  Si  Si10  1  0.340  0.163  0.061  1.0
  Si  Si11  1  0.830  0.175  0.060  1.0
  N  N12  1  0.125  0.826  0.741  1.0
  N  N13  1  0.008  0.011  0.476  1.0
  N  N14  1  0.149  0.304  0.740  1.0
  N  N15  1  0.300  0.146  0.231  1.0
  N  N16  1  0.705  0.815  0.744  1.0
  N  N17  1  0.811  0.702  0.243  1.0
  N  N18  1  0.518  0.033  0.005  1.0
  N  N19  1  0.995  0.486  0.027  1.0
  N  N20  1  0.828  0.133  0.232  1.0
  N  N21  1  0.009  0.015  0.986  1.0
  O  O22  1  0.031  0.522  0.499  1.0
  O  O23  1  0.498  0.988  0.520  1.0
  O  O24  1  0.493  0.517  0.506  1.0
  O  O25  1  0.500  0.469  0.012  1.0
[/CIF]
.
The material described by SrYbAl2Si2N5O2 crystallizes in the triclinic P1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to one N(6), one N(7), one N(8), two equivalent N(4), two equivalent N(9), one O(1), one O(3), and one O(4) atom. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one N(1), one N(5), one N(7), one N(8), two equivalent N(3), one O(1), one O(2), one O(3), and one O(4) atom. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded to one N(1), one N(3), one N(5), one N(7), one N(8), and one O(4) atom to form YbN5O octahedra that share  a cornercorner with one Al(1)N2O2 tetrahedra,  a cornercorner with one Al(2)N2O2 tetrahedra,  a cornercorner with one Al(3)N2O2 tetrahedra, corners with two equivalent Al(4)N3O tetrahedra, corners with two equivalent Si(3)N3O tetrahedra, corners with two equivalent Si(4)N4 tetrahedra, and corners with three equivalent Si(1)N4 tetrahedra. In the second Yb site, Yb(2) is bonded to one N(4), one N(6), one N(9), one O(1), one O(2), and one O(3) atom to form YbN3O3 octahedra that share  a cornercorner with one Al(4)N3O tetrahedra,  a cornercorner with one Si(3)N3O tetrahedra,  a cornercorner with one Si(4)N4 tetrahedra, corners with two equivalent Al(1)N2O2 tetrahedra, corners with two equivalent Al(2)N2O2 tetrahedra, corners with two equivalent Al(3)N2O2 tetrahedra, and corners with three equivalent Si(2)N4 tetrahedra. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to one N(1), one N(2), one O(1), and one O(2) atom to form AlN2O2 tetrahedra that share  a cornercorner with one Yb(1)N5O octahedra, corners with two equivalent Yb(2)N3O3 octahedra,  a cornercorner with one Si(1)N4 tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra, corners with two equivalent Al(2)N2O2 tetrahedra, and corners with two equivalent Al(3)N2O2 tetrahedra. The corner-sharing octahedral tilt angles range from 57-62°. In the second Al site, Al(2) is bonded to one N(2), one N(3), one O(1), and one O(3) atom to form AlN2O2 tetrahedra that share  a cornercorner with one Yb(1)N5O octahedra, corners with two equivalent Yb(2)N3O3 octahedra,  a cornercorner with one Si(1)N4 tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra, corners with two equivalent Al(1)N2O2 tetrahedra, and corners with two equivalent Al(3)N2O2 tetrahedra. The corner-sharing octahedral tilt angles range from 60-61°. In the third Al site, Al(3) is bonded to one N(2), one N(5), one O(2), and one O(3) atom to form AlN2O2 tetrahedra that share  a cornercorner with one Yb(1)N5O octahedra, corners with two equivalent Yb(2)N3O3 octahedra,  a cornercorner with one Si(1)N4 tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra, corners with two equivalent Al(1)N2O2 tetrahedra, and corners with two equivalent Al(2)N2O2 tetrahedra. The corner-sharing octahedral tilt angles range from 57-63°. In the fourth Al site, Al(4) is bonded to one N(10), one N(6), one N(8), and one O(4) atom to form AlN3O tetrahedra that share  a cornercorner with one Yb(2)N3O3 octahedra, corners with two equivalent Yb(1)N5O octahedra,  a cornercorner with one Si(1)N4 tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra, corners with two equivalent Si(3)N3O tetrahedra, and corners with two equivalent Si(4)N4 tetrahedra. The corner-sharing octahedral tilt angles range from 63-65°. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one N(1), one N(10), one N(3), and one N(5) atom to form SiN4 tetrahedra that share corners with three equivalent Yb(1)N5O octahedra,  a cornercorner with one Al(1)N2O2 tetrahedra,  a cornercorner with one Al(2)N2O2 tetrahedra,  a cornercorner with one Al(3)N2O2 tetrahedra,  a cornercorner with one Al(4)N3O tetrahedra,  a cornercorner with one Si(3)N3O tetrahedra, and  a cornercorner with one Si(4)N4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-56°. In the second Si site, Si(2) is bonded to one N(2), one N(4), one N(6), and one N(9) atom to form SiN4 tetrahedra that share corners with three equivalent Yb(2)N3O3 octahedra,  a cornercorner with one Al(1)N2O2 tetrahedra,  a cornercorner with one Al(2)N2O2 tetrahedra,  a cornercorner with one Al(3)N2O2 tetrahedra,  a cornercorner with one Al(4)N3O tetrahedra,  a cornercorner with one Si(3)N3O tetrahedra, and  a cornercorner with one Si(4)N4 tetrahedra. The corner-sharing octahedral tilt angles range from 54-60°. In the third Si site, Si(3) is bonded to one N(10), one N(4), one N(7), and one O(4) atom to form SiN3O tetrahedra that share  a cornercorner with one Yb(2)N3O3 octahedra, corners with two equivalent Yb(1)N5O octahedra,  a cornercorner with one Si(1)N4 tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra, corners with two equivalent Al(4)N3O tetrahedra, and corners with two equivalent Si(4)N4 tetrahedra. The corner-sharing octahedral tilt angles range from 56-60°. In the fourth Si site, Si(4) is bonded to one N(10), one N(7), one N(8), and one N(9) atom to form SiN4 tetrahedra that share  a cornercorner with one Yb(2)N3O3 octahedra, corners with two equivalent Yb(1)N5O octahedra,  a cornercorner with one Si(1)N4 tetrahedra,  a cornercorner with one Si(2)N4 tetrahedra, corners with two equivalent Al(4)N3O tetrahedra, and corners with two equivalent Si(3)N3O tetrahedra. The corner-sharing octahedral tilt angles range from 57-60°. There are ten inequivalent N sites. In the first N site, N(1) is bonded in a 3-coordinate geometry to one Sr(2), one Yb(1), one Al(1), and one Si(1) atom. In the second N site, N(2) is bonded in a tetrahedral geometry to one Al(1), one Al(2), one Al(3), and one Si(2) atom. In the third N site, N(3) is bonded in a 3-coordinate geometry to two equivalent Sr(2), one Yb(1), one Al(2), and one Si(1) atom. In the fourth N site, N(4) is bonded in a distorted trigonal planar geometry to two equivalent Sr(1), one Yb(2), one Si(2), and one Si(3) atom. In the fifth N site, N(5) is bonded in a 4-coordinate geometry to one Sr(2), one Yb(1), one Al(3), and one Si(1) atom. In the sixth N site, N(6) is bonded in a 4-coordinate geometry to one Sr(1), one Yb(2), one Al(4), and one Si(2) atom. In the seventh N site, N(7) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Yb(1), one Si(3), and one Si(4) atom. In the eighth N site, N(8) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Yb(1), one Al(4), and one Si(4) atom. In the ninth N site, N(9) is bonded in a 3-coordinate geometry to two equivalent Sr(1), one Yb(2), one Si(2), and one Si(4) atom. In the tenth N site, N(10) is bonded in a tetrahedral geometry to one Al(4), one Si(1), one Si(3), and one Si(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), one Yb(2), one Al(1), and one Al(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Sr(2), one Yb(2), one Al(1), and one Al(3) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), one Yb(2), one Al(2), and one Al(3) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), one Yb(1), one Al(4), and one Si(3) atom. is represented by the CIF file [CIF]
data_SrYbAl2Si2N5O2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.048
_cell_length_b   6.151
_cell_length_c   10.040
_cell_angle_alpha   89.317
_cell_angle_beta   90.260
_cell_angle_gamma   119.313
_symmetry_Int_Tables_number   1
_cell_volume   325.625
_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
  Sr  Sr0  1  0.343  0.665  0.230  1.0
  Sr  Sr1  1  0.678  0.358  0.756  1.0
  Yb  Yb2  1  0.329  0.659  0.873  1.0
  Yb  Yb3  1  0.660  0.330  0.374  1.0
  Al  Al4  1  0.167  0.836  0.558  1.0
  Al  Al5  1  0.169  0.339  0.559  1.0
  Al  Al6  1  0.674  0.833  0.560  1.0
  Al  Al7  1  0.833  0.663  0.063  1.0
  Si  Si8  1  0.007  0.011  0.801  1.0
  Si  Si9  1  1.000  0.000  0.297  1.0
  Si  Si10  1  0.340  0.163  0.061  1.0
  Si  Si11  1  0.830  0.175  0.060  1.0
  N  N12  1  0.125  0.826  0.741  1.0
  N  N13  1  0.008  0.011  0.476  1.0
  N  N14  1  0.149  0.304  0.740  1.0
  N  N15  1  0.300  0.146  0.231  1.0
  N  N16  1  0.705  0.815  0.744  1.0
  N  N17  1  0.811  0.702  0.243  1.0
  N  N18  1  0.518  0.033  0.005  1.0
  N  N19  1  0.995  0.486  0.027  1.0
  N  N20  1  0.828  0.133  0.232  1.0
  N  N21  1  0.009  0.015  0.986  1.0
  O  O22  1  0.031  0.522  0.499  1.0
  O  O23  1  0.498  0.988  0.520  1.0
  O  O24  1  0.493  0.517  0.506  1.0
  O  O25  1  0.500  0.469  0.012  1.0
[/CIF]
.