The compound described by Sr(Mg4Al3)4 is gamma-brass-derived structured and crystallizes in the trigonal R3m space group. Sr(1) is bonded in a 16-coordinate geometry to one Mg(4), three equivalent Mg(2), three equivalent Mg(3), three equivalent Al(1), and six equivalent Al(3) atoms. There are five inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 11-coordinate geometry to one Mg(2), one Mg(3), one Mg(4), two equivalent Mg(5), two equivalent Al(1), two equivalent Al(2), and two equivalent Al(3) atoms. In the second Mg site, Mg(2) is bonded in a 4-coordinate geometry to one Sr(1), one Mg(1), four equivalent Mg(5), one Al(2), two equivalent Al(1), and two equivalent Al(3) atoms. In the third Mg site, Mg(3) is bonded in a 3-coordinate geometry to one Sr(1), one Mg(1), four equivalent Mg(5), one Al(1), and four equivalent Al(3) atoms. In the fourth Mg site, Mg(4) is bonded in a 16-coordinate geometry to one Sr(1), three equivalent Mg(1), three equivalent Al(1), three equivalent Al(2), and six equivalent Al(3) atoms. In the fifth Mg site, Mg(5) is bonded in a 12-coordinate geometry to one Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(5), one Al(1), two equivalent Al(2), and two equivalent Al(3) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 12-coordinate geometry to one Sr(1), one Mg(3), one Mg(4), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(5), one Al(2), and two equivalent Al(1) atoms. In the second Al site, Al(2) is bonded in a 11-coordinate geometry to one Mg(2), one Mg(4), two equivalent Mg(1), four equivalent Mg(5), one Al(1), and two equivalent Al(3) atoms. In the third Al site, Al(3) is bonded in a 11-coordinate geometry to one Sr(1), one Mg(1), one Mg(2), one Mg(4), two equivalent Mg(3), two equivalent Mg(5), one Al(2), and two equivalent Al(3) atoms. is represented by the CIF file [CIF]
data_Sr(Mg4Al3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.951
_cell_length_b   9.337
_cell_length_c   9.337
_cell_angle_alpha   110.294
_cell_angle_beta   108.636
_cell_angle_gamma   108.636
_symmetry_Int_Tables_number   1
_cell_volume   606.834
_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
  Sr  Sr0  1  0.375  1.000  1.000  1.0
  Mg  Mg1  1  0.996  0.341  0.000  1.0
  Mg  Mg2  1  0.617  0.334  0.000  1.0
  Mg  Mg3  1  0.314  0.601  0.000  1.0
  Mg  Mg4  1  0.992  0.000  0.000  1.0
  Mg  Mg5  1  0.687  0.686  0.292  1.0
  Mg  Mg6  1  0.001  0.606  0.314  1.0
  Mg  Mg7  1  0.617  0.000  0.334  1.0
  Mg  Mg8  1  0.996  1.000  0.341  1.0
  Mg  Mg9  1  0.395  0.708  0.394  1.0
  Mg  Mg10  1  0.713  0.399  0.399  1.0
  Mg  Mg11  1  0.314  1.000  0.601  1.0
  Mg  Mg12  1  0.001  0.314  0.606  1.0
  Mg  Mg13  1  0.655  0.659  0.659  1.0
  Mg  Mg14  1  0.283  0.666  0.666  1.0
  Mg  Mg15  1  0.687  0.292  0.686  1.0
  Mg  Mg16  1  0.395  0.394  0.708  1.0
  Al  Al17  1  0.634  0.818  1.000  1.0
  Al  Al18  1  0.813  0.639  0.000  1.0
  Al  Al19  1  0.362  0.366  0.180  1.0
  Al  Al20  1  0.816  0.182  0.182  1.0
  Al  Al21  1  0.181  0.820  0.186  1.0
  Al  Al22  1  0.174  0.361  0.361  1.0
  Al  Al23  1  0.362  0.180  0.366  1.0
  Al  Al24  1  0.996  0.814  0.634  1.0
  Al  Al25  1  0.813  0.000  0.639  1.0
  Al  Al26  1  0.996  0.634  0.814  1.0
  Al  Al27  1  0.634  1.000  0.818  1.0
  Al  Al28  1  0.181  0.186  0.820  1.0
[/CIF]
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The compound described by Sr(Mg4Al3)4 is gamma-brass-derived structured and crystallizes in the trigonal R3m space group. Sr(1) is bonded in a 16-coordinate geometry to one Mg(4), three equivalent Mg(2), three equivalent Mg(3), three equivalent Al(1), and six equivalent Al(3) atoms. There are five inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 11-coordinate geometry to one Mg(2), one Mg(3), one Mg(4), two equivalent Mg(5), two equivalent Al(1), two equivalent Al(2), and two equivalent Al(3) atoms. In the second Mg site, Mg(2) is bonded in a 4-coordinate geometry to one Sr(1), one Mg(1), four equivalent Mg(5), one Al(2), two equivalent Al(1), and two equivalent Al(3) atoms. In the third Mg site, Mg(3) is bonded in a 3-coordinate geometry to one Sr(1), one Mg(1), four equivalent Mg(5), one Al(1), and four equivalent Al(3) atoms. In the fourth Mg site, Mg(4) is bonded in a 16-coordinate geometry to one Sr(1), three equivalent Mg(1), three equivalent Al(1), three equivalent Al(2), and six equivalent Al(3) atoms. In the fifth Mg site, Mg(5) is bonded in a 12-coordinate geometry to one Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(5), one Al(1), two equivalent Al(2), and two equivalent Al(3) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 12-coordinate geometry to one Sr(1), one Mg(3), one Mg(4), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(5), one Al(2), and two equivalent Al(1) atoms. In the second Al site, Al(2) is bonded in a 11-coordinate geometry to one Mg(2), one Mg(4), two equivalent Mg(1), four equivalent Mg(5), one Al(1), and two equivalent Al(3) atoms. In the third Al site, Al(3) is bonded in a 11-coordinate geometry to one Sr(1), one Mg(1), one Mg(2), one Mg(4), two equivalent Mg(3), two equivalent Mg(5), one Al(2), and two equivalent Al(3) atoms. is represented by the CIF file [CIF]
data_Sr(Mg4Al3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.951
_cell_length_b   9.337
_cell_length_c   9.337
_cell_angle_alpha   110.294
_cell_angle_beta   108.636
_cell_angle_gamma   108.636
_symmetry_Int_Tables_number   1
_cell_volume   606.834
_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
  Sr  Sr0  1  0.375  1.000  1.000  1.0
  Mg  Mg1  1  0.996  0.341  0.000  1.0
  Mg  Mg2  1  0.617  0.334  0.000  1.0
  Mg  Mg3  1  0.314  0.601  0.000  1.0
  Mg  Mg4  1  0.992  0.000  0.000  1.0
  Mg  Mg5  1  0.687  0.686  0.292  1.0
  Mg  Mg6  1  0.001  0.606  0.314  1.0
  Mg  Mg7  1  0.617  0.000  0.334  1.0
  Mg  Mg8  1  0.996  1.000  0.341  1.0
  Mg  Mg9  1  0.395  0.708  0.394  1.0
  Mg  Mg10  1  0.713  0.399  0.399  1.0
  Mg  Mg11  1  0.314  1.000  0.601  1.0
  Mg  Mg12  1  0.001  0.314  0.606  1.0
  Mg  Mg13  1  0.655  0.659  0.659  1.0
  Mg  Mg14  1  0.283  0.666  0.666  1.0
  Mg  Mg15  1  0.687  0.292  0.686  1.0
  Mg  Mg16  1  0.395  0.394  0.708  1.0
  Al  Al17  1  0.634  0.818  1.000  1.0
  Al  Al18  1  0.813  0.639  0.000  1.0
  Al  Al19  1  0.362  0.366  0.180  1.0
  Al  Al20  1  0.816  0.182  0.182  1.0
  Al  Al21  1  0.181  0.820  0.186  1.0
  Al  Al22  1  0.174  0.361  0.361  1.0
  Al  Al23  1  0.362  0.180  0.366  1.0
  Al  Al24  1  0.996  0.814  0.634  1.0
  Al  Al25  1  0.813  0.000  0.639  1.0
  Al  Al26  1  0.996  0.634  0.814  1.0
  Al  Al27  1  0.634  1.000  0.818  1.0
  Al  Al28  1  0.181  0.186  0.820  1.0
[/CIF]
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