LaOsGa4 crystallizes in the orthorhombic Pmma space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 16-coordinate geometry to four equivalent Os(1), two equivalent Ga(4), two equivalent Ga(6), four equivalent Ga(1), and four equivalent Ga(5) atoms. In the second La site, La(2) is bonded in a 10-coordinate geometry to one Ga(2), one Ga(4), two equivalent Ga(3), two equivalent Ga(5), two equivalent Ga(6), and four equivalent Ga(1) atoms. There are two inequivalent Os sites. In the first Os site, Os(2) is bonded in a 8-coordinate geometry to two equivalent Ga(2), two equivalent Ga(3), and four equivalent Ga(1) atoms. In the second Os site, Os(1) is bonded in a 8-coordinate geometry to two equivalent La(1), two equivalent Ga(1), two equivalent Ga(3), two equivalent Ga(4), and two equivalent Ga(5) atoms. There are six inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to one La(1), two equivalent La(2), one Os(1), one Os(2), one Ga(2), one Ga(3), one Ga(4), and one Ga(6) atom. In the second Ga site, Ga(2) is bonded in a 10-coordinate geometry to two equivalent La(2), two equivalent Os(2), two equivalent Ga(4), and four equivalent Ga(1) atoms. In the third Ga site, Ga(3) is bonded in a 10-coordinate geometry to two equivalent La(2), one Os(2), two equivalent Os(1), one Ga(3), two equivalent Ga(1), and two equivalent Ga(4) atoms. In the fourth Ga site, Ga(4) is bonded in a 10-coordinate geometry to one La(1), one La(2), two equivalent Os(1), one Ga(2), one Ga(4), two equivalent Ga(1), and two equivalent Ga(3) atoms. In the fifth Ga site, Ga(5) is bonded in a 5-coordinate geometry to two equivalent La(1), two equivalent La(2), two equivalent Os(1), and one Ga(6) atom. In the sixth Ga site, Ga(6) is bonded to two equivalent La(1), four equivalent La(2), two equivalent Ga(5), and four equivalent Ga(1) atoms to form face-sharing GaLa6Ga6 cuboctahedra.
LaOsGa4 crystallizes in the orthorhombic Pmma space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 16-coordinate geometry to four equivalent Os(1), two equivalent Ga(4), two equivalent Ga(6), four equivalent Ga(1), and four equivalent Ga(5) atoms. All La(1)-Os(1) bond lengths are 3.54 Å. Both La(1)-Ga(4) bond lengths are 3.21 Å. Both La(1)-Ga(6) bond lengths are 3.48 Å. All La(1)-Ga(1) bond lengths are 3.11 Å. There are two shorter (3.06 Å) and two longer (3.24 Å) La(1)-Ga(5) bond lengths. In the second La site, La(2) is bonded in a 10-coordinate geometry to one Ga(2), one Ga(4), two equivalent Ga(3), two equivalent Ga(5), two equivalent Ga(6), and four equivalent Ga(1) atoms. The La(2)-Ga(2) bond length is 3.16 Å. The La(2)-Ga(4) bond length is 3.10 Å. Both La(2)-Ga(3) bond lengths are 3.20 Å. Both La(2)-Ga(5) bond lengths are 3.10 Å. Both La(2)-Ga(6) bond lengths are 3.52 Å. There are two shorter (3.16 Å) and two longer (3.19 Å) La(2)-Ga(1) bond lengths. There are two inequivalent Os sites. In the first Os site, Os(2) is bonded in a 8-coordinate geometry to two equivalent Ga(2), two equivalent Ga(3), and four equivalent Ga(1) atoms. Both Os(2)-Ga(2) bond lengths are 2.65 Å. Both Os(2)-Ga(3) bond lengths are 2.69 Å. All Os(2)-Ga(1) bond lengths are 2.59 Å. In the second Os site, Os(1) is bonded in a 8-coordinate geometry to two equivalent La(1), two equivalent Ga(1), two equivalent Ga(3), two equivalent Ga(4), and two equivalent Ga(5) atoms. Both Os(1)-Ga(1) bond lengths are 2.56 Å. Both Os(1)-Ga(3) bond lengths are 2.64 Å. Both Os(1)-Ga(4) bond lengths are 2.64 Å. Both Os(1)-Ga(5) bond lengths are 2.58 Å. There are six inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to one La(1), two equivalent La(2), one Os(1), one Os(2), one Ga(2), one Ga(3), one Ga(4), and one Ga(6) atom. The Ga(1)-Ga(2) bond length is 2.70 Å. The Ga(1)-Ga(3) bond length is 2.73 Å. The Ga(1)-Ga(4) bond length is 2.78 Å. The Ga(1)-Ga(6) bond length is 2.84 Å. In the second Ga site, Ga(2) is bonded in a 10-coordinate geometry to two equivalent La(2), two equivalent Os(2), two equivalent Ga(4), and four equivalent Ga(1) atoms. Both Ga(2)-Ga(4) bond lengths are 2.81 Å. In the third Ga site, Ga(3) is bonded in a 10-coordinate geometry to two equivalent La(2), one Os(2), two equivalent Os(1), one Ga(3), two equivalent Ga(1), and two equivalent Ga(4) atoms. The Ga(3)-Ga(3) bond length is 2.73 Å. Both Ga(3)-Ga(4) bond lengths are 2.81 Å. In the fourth Ga site, Ga(4) is bonded in a 10-coordinate geometry to one La(1), one La(2), two equivalent Os(1), one Ga(2), one Ga(4), two equivalent Ga(1), and two equivalent Ga(3) atoms. The Ga(4)-Ga(4) bond length is 2.73 Å. In the fifth Ga site, Ga(5) is bonded in a 5-coordinate geometry to two equivalent La(1), two equivalent La(2), two equivalent Os(1), and one Ga(6) atom. The Ga(5)-Ga(6) bond length is 2.77 Å. In the sixth Ga site, Ga(6) is bonded to two equivalent La(1), four equivalent La(2), two equivalent Ga(5), and four equivalent Ga(1) atoms to form face-sharing GaLa6Ga6 cuboctahedra.