Na3Sr3GaSb4 crystallizes in the hexagonal P6_3mc space group. Na(1) is bonded in a 4-coordinate geometry to one Sb(1) and three equivalent Sb(2) atoms. Sr(1) is bonded in a 7-coordinate geometry to one Ga(1), two equivalent Sb(1), and four equivalent Sb(2) atoms. Ga(1) is bonded in a 7-coordinate geometry to three equivalent Sr(1), one Sb(1), and three equivalent Sb(2) atoms. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 10-coordinate geometry to three equivalent Na(1), six equivalent Sr(1), and one Ga(1) atom. In the second Sb site, Sb(2) is bonded in a 8-coordinate geometry to three equivalent Na(1), four equivalent Sr(1), and one Ga(1) atom.
Na3Sr3GaSb4 crystallizes in the hexagonal P6_3mc space group. Na(1) is bonded in a 4-coordinate geometry to one Sb(1) and three equivalent Sb(2) atoms. The Na(1)-Sb(1) bond length is 3.39 Å. There are two shorter (3.13 Å) and one longer (3.31 Å) Na(1)-Sb(2) bond length. Sr(1) is bonded in a 7-coordinate geometry to one Ga(1), two equivalent Sb(1), and four equivalent Sb(2) atoms. The Sr(1)-Ga(1) bond length is 3.47 Å. There is one shorter (3.46 Å) and one longer (3.75 Å) Sr(1)-Sb(1) bond length. There are two shorter (3.42 Å) and two longer (3.53 Å) Sr(1)-Sb(2) bond lengths. Ga(1) is bonded in a 7-coordinate geometry to three equivalent Sr(1), one Sb(1), and three equivalent Sb(2) atoms. The Ga(1)-Sb(1) bond length is 2.83 Å. All Ga(1)-Sb(2) bond lengths are 2.72 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 10-coordinate geometry to three equivalent Na(1), six equivalent Sr(1), and one Ga(1) atom. In the second Sb site, Sb(2) is bonded in a 8-coordinate geometry to three equivalent Na(1), four equivalent Sr(1), and one Ga(1) atom.