The material described by Sr4NdNb2Al3O15 is (Cubic) Perovskite-derived structured and crystallizes in the trigonal R-3m space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to three equivalent O(1), three equivalent O(5), and six equivalent O(2) atoms to form SrO12 cuboctahedra that share corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Nd(1)O12 cuboctahedra, corners with six equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(3)O12 cuboctahedra, faces with three equivalent Nd(1)O12 cuboctahedra,  a faceface with one Al(2)O6 octahedra,  a faceface with one Al(4)O6 octahedra, faces with three equivalent Nb(1)O6 octahedra, and faces with three equivalent Al(1)O6 octahedra. In the second Sr site, Sr(2) is bonded to three equivalent O(1), three equivalent O(4), and six equivalent O(3) atoms to form SrO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(4)O12 cuboctahedra, corners with six equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Sr(3)O12 cuboctahedra, faces with three equivalent Sr(4)O12 cuboctahedra,  a faceface with one Nb(1)O6 octahedra,  a faceface with one Al(3)O6 octahedra, faces with three equivalent Nb(2)O6 octahedra, and faces with three equivalent Al(2)O6 octahedra. In the third Sr site, Sr(3) is bonded to three equivalent O(2), three equivalent O(3), and six equivalent O(1) atoms to form SrO12 cuboctahedra that share corners with three equivalent Sr(4)O12 cuboctahedra, corners with three equivalent Nd(1)O12 cuboctahedra, corners with six equivalent Sr(3)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra,  a faceface with one Nb(2)O6 octahedra,  a faceface with one Al(1)O6 octahedra, faces with three equivalent Nb(1)O6 octahedra, and faces with three equivalent Al(2)O6 octahedra. In the fourth Sr site, Sr(4) is bonded to three equivalent O(3) and nine equivalent O(4) atoms to form SrO12 cuboctahedra that share corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Sr(3)O12 cuboctahedra, corners with six equivalent Sr(4)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Sr(4)O12 cuboctahedra,  a faceface with one Al(2)O6 octahedra, faces with three equivalent Al(3)O6 octahedra, and faces with four equivalent Nb(2)O6 octahedra. Nd(1) is bonded to three equivalent O(2) and nine equivalent O(5) atoms to form NdO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(3)O12 cuboctahedra, corners with six equivalent Nd(1)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Nd(1)O12 cuboctahedra,  a faceface with one Nb(1)O6 octahedra, faces with three equivalent Al(4)O6 octahedra, and faces with four equivalent Al(1)O6 octahedra. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form NbO6 octahedra that share corners with three equivalent Al(1)O6 octahedra, corners with three equivalent Al(2)O6 octahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Nd(1)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, and faces with three equivalent Sr(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the second Nb site, Nb(2) is bonded to three equivalent O(3) and three equivalent O(4) atoms to form NbO6 octahedra that share corners with three equivalent Al(2)O6 octahedra, corners with three equivalent Al(3)O6 octahedra,  a faceface with one Sr(3)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra, and faces with four equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedra are not tilted. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to three equivalent O(2) and three equivalent O(5) atoms to form AlO6 octahedra that share corners with three equivalent Nb(1)O6 octahedra, corners with three equivalent Al(4)O6 octahedra,  a faceface with one Sr(3)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, and faces with four equivalent Nd(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-3°. In the second Al site, Al(2) is bonded to three equivalent O(1) and three equivalent O(3) atoms to form AlO6 octahedra that share corners with three equivalent Nb(1)O6 octahedra, corners with three equivalent Nb(2)O6 octahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra, and faces with three equivalent Sr(3)O12 cuboctahedra. The corner-sharing octahedra are not tilted. In the third Al site, Al(3) is bonded to six equivalent O(4) atoms to form AlO6 octahedra that share corners with six equivalent Nb(2)O6 octahedra, faces with two equivalent Sr(2)O12 cuboctahedra, and faces with six equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedra are not tilted. In the fourth Al site, Al(4) is bonded to six equivalent O(5) atoms to form AlO6 octahedra that share corners with six equivalent Al(1)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with six equivalent Nd(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 3°. There are five inequivalent O sites. In the first O site, O(3) is bonded in a distorted linear geometry to one Sr(3), one Sr(4), two equivalent Sr(2), one Nb(2), and one Al(2) atom. In the second O site, O(4) is bonded in a distorted linear geometry to one Sr(2), three equivalent Sr(4), one Nb(2), and one Al(3) atom. In the third O site, O(5) is bonded to one Sr(1), three equivalent Nd(1), one Al(1), and one Al(4) atom to form a mixture of distorted corner, face, and edge-sharing OSrNd3Al2 octahedra. The corner-sharing octahedral tilt angles range from 0-60°. In the fourth O site, O(1) is bonded in a distorted linear geometry to one Sr(1), one Sr(2), two equivalent Sr(3), one Nb(1), and one Al(2) atom. In the fifth O site, O(2) is bonded in a distorted linear geometry to one Sr(3), two equivalent Sr(1), one Nd(1), one Nb(1), and one Al(1) atom. is represented by the CIF card [CIF]
data_Sr4NdNb2Al3O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   22.842
_cell_length_b   22.842
_cell_length_c   22.842
_cell_angle_alpha   13.901
_cell_angle_beta   13.901
_cell_angle_gamma   13.901
_symmetry_Int_Tables_number   1
_cell_volume   598.663
_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  0.048  0.048  0.048  1.0
  Sr  Sr1  1  0.450  0.450  0.450  1.0
  Sr  Sr2  1  0.750  0.750  0.750  1.0
  Sr  Sr3  1  0.850  0.850  0.850  1.0
  Sr  Sr4  1  0.150  0.150  0.150  1.0
  Sr  Sr5  1  0.250  0.250  0.250  1.0
  Sr  Sr6  1  0.550  0.550  0.550  1.0
  Sr  Sr7  1  0.952  0.952  0.952  1.0
  Nd  Nd8  1  0.652  0.652  0.652  1.0
  Nd  Nd9  1  0.348  0.348  0.348  1.0
  Nb  Nb10  1  0.400  0.400  0.400  1.0
  Nb  Nb11  1  0.800  0.800  0.800  1.0
  Nb  Nb12  1  0.200  0.200  0.200  1.0
  Nb  Nb13  1  0.600  0.600  0.600  1.0
  Al  Al14  1  0.699  0.699  0.699  1.0
  Al  Al15  1  0.100  0.100  0.100  1.0
  Al  Al16  1  0.500  0.500  0.500  1.0
  Al  Al17  1  0.900  0.900  0.900  1.0
  Al  Al18  1  0.301  0.301  0.301  1.0
  Al  Al19  1  0.000  0.000  0.000  1.0
  O  O20  1  0.247  0.247  0.756  1.0
  O  O21  1  0.551  0.043  0.551  1.0
  O  O22  1  0.043  0.551  0.551  1.0
  O  O23  1  0.756  0.247  0.247  1.0
  O  O24  1  0.953  0.442  0.953  1.0
  O  O25  1  0.647  0.647  0.158  1.0
  O  O26  1  0.247  0.756  0.247  1.0
  O  O27  1  0.551  0.551  0.043  1.0
  O  O28  1  0.442  0.953  0.953  1.0
  O  O29  1  0.158  0.647  0.647  1.0
  O  O30  1  0.353  0.842  0.353  1.0
  O  O31  1  0.047  0.047  0.558  1.0
  O  O32  1  0.953  0.953  0.442  1.0
  O  O33  1  0.647  0.158  0.647  1.0
  O  O34  1  0.842  0.353  0.353  1.0
  O  O35  1  0.558  0.047  0.047  1.0
  O  O36  1  0.753  0.244  0.753  1.0
  O  O37  1  0.449  0.449  0.957  1.0
  O  O38  1  0.353  0.353  0.842  1.0
  O  O39  1  0.047  0.558  0.047  1.0
  O  O40  1  0.244  0.753  0.753  1.0
  O  O41  1  0.957  0.449  0.449  1.0
  O  O42  1  0.155  0.645  0.155  1.0
  O  O43  1  0.845  0.845  0.355  1.0
  O  O44  1  0.449  0.957  0.449  1.0
  O  O45  1  0.753  0.753  0.244  1.0
  O  O46  1  0.645  0.155  0.155  1.0
  O  O47  1  0.355  0.845  0.845  1.0
  O  O48  1  0.155  0.155  0.645  1.0
  O  O49  1  0.845  0.355  0.845  1.0
[/CIF]
.
The material described by Sr4NdNb2Al3O15 is (Cubic) Perovskite-derived structured and crystallizes in the trigonal R-3m space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to three equivalent O(1), three equivalent O(5), and six equivalent O(2) atoms to form SrO12 cuboctahedra that share corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Nd(1)O12 cuboctahedra, corners with six equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(3)O12 cuboctahedra, faces with three equivalent Nd(1)O12 cuboctahedra,  a faceface with one Al(2)O6 octahedra,  a faceface with one Al(4)O6 octahedra, faces with three equivalent Nb(1)O6 octahedra, and faces with three equivalent Al(1)O6 octahedra. In the second Sr site, Sr(2) is bonded to three equivalent O(1), three equivalent O(4), and six equivalent O(3) atoms to form SrO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(4)O12 cuboctahedra, corners with six equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Sr(3)O12 cuboctahedra, faces with three equivalent Sr(4)O12 cuboctahedra,  a faceface with one Nb(1)O6 octahedra,  a faceface with one Al(3)O6 octahedra, faces with three equivalent Nb(2)O6 octahedra, and faces with three equivalent Al(2)O6 octahedra. In the third Sr site, Sr(3) is bonded to three equivalent O(2), three equivalent O(3), and six equivalent O(1) atoms to form SrO12 cuboctahedra that share corners with three equivalent Sr(4)O12 cuboctahedra, corners with three equivalent Nd(1)O12 cuboctahedra, corners with six equivalent Sr(3)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra,  a faceface with one Nb(2)O6 octahedra,  a faceface with one Al(1)O6 octahedra, faces with three equivalent Nb(1)O6 octahedra, and faces with three equivalent Al(2)O6 octahedra. In the fourth Sr site, Sr(4) is bonded to three equivalent O(3) and nine equivalent O(4) atoms to form SrO12 cuboctahedra that share corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Sr(3)O12 cuboctahedra, corners with six equivalent Sr(4)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Sr(4)O12 cuboctahedra,  a faceface with one Al(2)O6 octahedra, faces with three equivalent Al(3)O6 octahedra, and faces with four equivalent Nb(2)O6 octahedra. Nd(1) is bonded to three equivalent O(2) and nine equivalent O(5) atoms to form NdO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(3)O12 cuboctahedra, corners with six equivalent Nd(1)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Nd(1)O12 cuboctahedra,  a faceface with one Nb(1)O6 octahedra, faces with three equivalent Al(4)O6 octahedra, and faces with four equivalent Al(1)O6 octahedra. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form NbO6 octahedra that share corners with three equivalent Al(1)O6 octahedra, corners with three equivalent Al(2)O6 octahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Nd(1)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, and faces with three equivalent Sr(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the second Nb site, Nb(2) is bonded to three equivalent O(3) and three equivalent O(4) atoms to form NbO6 octahedra that share corners with three equivalent Al(2)O6 octahedra, corners with three equivalent Al(3)O6 octahedra,  a faceface with one Sr(3)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra, and faces with four equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedra are not tilted. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to three equivalent O(2) and three equivalent O(5) atoms to form AlO6 octahedra that share corners with three equivalent Nb(1)O6 octahedra, corners with three equivalent Al(4)O6 octahedra,  a faceface with one Sr(3)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, and faces with four equivalent Nd(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-3°. In the second Al site, Al(2) is bonded to three equivalent O(1) and three equivalent O(3) atoms to form AlO6 octahedra that share corners with three equivalent Nb(1)O6 octahedra, corners with three equivalent Nb(2)O6 octahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra, and faces with three equivalent Sr(3)O12 cuboctahedra. The corner-sharing octahedra are not tilted. In the third Al site, Al(3) is bonded to six equivalent O(4) atoms to form AlO6 octahedra that share corners with six equivalent Nb(2)O6 octahedra, faces with two equivalent Sr(2)O12 cuboctahedra, and faces with six equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedra are not tilted. In the fourth Al site, Al(4) is bonded to six equivalent O(5) atoms to form AlO6 octahedra that share corners with six equivalent Al(1)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with six equivalent Nd(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 3°. There are five inequivalent O sites. In the first O site, O(3) is bonded in a distorted linear geometry to one Sr(3), one Sr(4), two equivalent Sr(2), one Nb(2), and one Al(2) atom. In the second O site, O(4) is bonded in a distorted linear geometry to one Sr(2), three equivalent Sr(4), one Nb(2), and one Al(3) atom. In the third O site, O(5) is bonded to one Sr(1), three equivalent Nd(1), one Al(1), and one Al(4) atom to form a mixture of distorted corner, face, and edge-sharing OSrNd3Al2 octahedra. The corner-sharing octahedral tilt angles range from 0-60°. In the fourth O site, O(1) is bonded in a distorted linear geometry to one Sr(1), one Sr(2), two equivalent Sr(3), one Nb(1), and one Al(2) atom. In the fifth O site, O(2) is bonded in a distorted linear geometry to one Sr(3), two equivalent Sr(1), one Nd(1), one Nb(1), and one Al(1) atom. is represented by the CIF card [CIF]
data_Sr4NdNb2Al3O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   22.842
_cell_length_b   22.842
_cell_length_c   22.842
_cell_angle_alpha   13.901
_cell_angle_beta   13.901
_cell_angle_gamma   13.901
_symmetry_Int_Tables_number   1
_cell_volume   598.663
_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  0.048  0.048  0.048  1.0
  Sr  Sr1  1  0.450  0.450  0.450  1.0
  Sr  Sr2  1  0.750  0.750  0.750  1.0
  Sr  Sr3  1  0.850  0.850  0.850  1.0
  Sr  Sr4  1  0.150  0.150  0.150  1.0
  Sr  Sr5  1  0.250  0.250  0.250  1.0
  Sr  Sr6  1  0.550  0.550  0.550  1.0
  Sr  Sr7  1  0.952  0.952  0.952  1.0
  Nd  Nd8  1  0.652  0.652  0.652  1.0
  Nd  Nd9  1  0.348  0.348  0.348  1.0
  Nb  Nb10  1  0.400  0.400  0.400  1.0
  Nb  Nb11  1  0.800  0.800  0.800  1.0
  Nb  Nb12  1  0.200  0.200  0.200  1.0
  Nb  Nb13  1  0.600  0.600  0.600  1.0
  Al  Al14  1  0.699  0.699  0.699  1.0
  Al  Al15  1  0.100  0.100  0.100  1.0
  Al  Al16  1  0.500  0.500  0.500  1.0
  Al  Al17  1  0.900  0.900  0.900  1.0
  Al  Al18  1  0.301  0.301  0.301  1.0
  Al  Al19  1  0.000  0.000  0.000  1.0
  O  O20  1  0.247  0.247  0.756  1.0
  O  O21  1  0.551  0.043  0.551  1.0
  O  O22  1  0.043  0.551  0.551  1.0
  O  O23  1  0.756  0.247  0.247  1.0
  O  O24  1  0.953  0.442  0.953  1.0
  O  O25  1  0.647  0.647  0.158  1.0
  O  O26  1  0.247  0.756  0.247  1.0
  O  O27  1  0.551  0.551  0.043  1.0
  O  O28  1  0.442  0.953  0.953  1.0
  O  O29  1  0.158  0.647  0.647  1.0
  O  O30  1  0.353  0.842  0.353  1.0
  O  O31  1  0.047  0.047  0.558  1.0
  O  O32  1  0.953  0.953  0.442  1.0
  O  O33  1  0.647  0.158  0.647  1.0
  O  O34  1  0.842  0.353  0.353  1.0
  O  O35  1  0.558  0.047  0.047  1.0
  O  O36  1  0.753  0.244  0.753  1.0
  O  O37  1  0.449  0.449  0.957  1.0
  O  O38  1  0.353  0.353  0.842  1.0
  O  O39  1  0.047  0.558  0.047  1.0
  O  O40  1  0.244  0.753  0.753  1.0
  O  O41  1  0.957  0.449  0.449  1.0
  O  O42  1  0.155  0.645  0.155  1.0
  O  O43  1  0.845  0.845  0.355  1.0
  O  O44  1  0.449  0.957  0.449  1.0
  O  O45  1  0.753  0.753  0.244  1.0
  O  O46  1  0.645  0.155  0.155  1.0
  O  O47  1  0.355  0.845  0.845  1.0
  O  O48  1  0.155  0.155  0.645  1.0
  O  O49  1  0.845  0.355  0.845  1.0
[/CIF]
.