Na3Sr3GaAs4 crystallizes in the hexagonal P6_3mc space group. Na(1) is bonded in a 4-coordinate geometry to one As(2) and three equivalent As(1) atoms. Sr(1) is bonded in a 7-coordinate geometry to one Ga(1), two equivalent As(2), and four equivalent As(1) atoms. Ga(1) is bonded in a distorted tetrahedral geometry to three equivalent Sr(1), one As(2), and three equivalent As(1) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to three equivalent Na(1), four equivalent Sr(1), and one Ga(1) atom. In the second As site, As(2) is bonded in a 10-coordinate geometry to three equivalent Na(1), six equivalent Sr(1), and one Ga(1) atom.
Na3Sr3GaAs4 crystallizes in the hexagonal P6_3mc space group. Na(1) is bonded in a 4-coordinate geometry to one As(2) and three equivalent As(1) atoms. The Na(1)-As(2) bond length is 3.33 Å. There are two shorter (2.95 Å) and one longer (3.10 Å) Na(1)-As(1) bond length. Sr(1) is bonded in a 7-coordinate geometry to one Ga(1), two equivalent As(2), and four equivalent As(1) atoms. The Sr(1)-Ga(1) bond length is 3.31 Å. There is one shorter (3.23 Å) and one longer (3.58 Å) Sr(1)-As(2) bond length. There are two shorter (3.22 Å) and two longer (3.32 Å) Sr(1)-As(1) bond lengths. Ga(1) is bonded in a distorted tetrahedral geometry to three equivalent Sr(1), one As(2), and three equivalent As(1) atoms. The Ga(1)-As(2) bond length is 2.62 Å. All Ga(1)-As(1) bond lengths are 2.53 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to three equivalent Na(1), four equivalent Sr(1), and one Ga(1) atom. In the second As site, As(2) is bonded in a 10-coordinate geometry to three equivalent Na(1), six equivalent Sr(1), and one Ga(1) atom.