YNi3Ga2 crystallizes in the hexagonal P6/mmm space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a hexagonal planar geometry to six equivalent Ni(1) atoms. In the second Y site, Y(2) is bonded in a 18-coordinate geometry to six equivalent Ni(1), six equivalent Ni(2), and six equivalent Ga(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 11-coordinate geometry to one Y(1), two equivalent Y(2), two equivalent Ni(1), two equivalent Ni(2), and four equivalent Ga(1) atoms. In the second Ni site, Ni(2) is bonded to four equivalent Y(2), four equivalent Ni(1), and four equivalent Ga(1) atoms to form a mixture of face and corner-sharing NiY4Ga4Ni4 cuboctahedra. Ga(1) is bonded in a 8-coordinate geometry to two equivalent Y(2), two equivalent Ni(2), and four equivalent Ni(1) atoms.
YNi3Ga2 crystallizes in the hexagonal P6/mmm space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a hexagonal planar geometry to six equivalent Ni(1) atoms. All Y(1)-Ni(1) bond lengths are 2.76 Å. In the second Y site, Y(2) is bonded in a 18-coordinate geometry to six equivalent Ni(1), six equivalent Ni(2), and six equivalent Ga(1) atoms. All Y(2)-Ni(1) bond lengths are 3.05 Å. All Y(2)-Ni(2) bond lengths are 3.21 Å. All Y(2)-Ga(1) bond lengths are 3.03 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 11-coordinate geometry to one Y(1), two equivalent Y(2), two equivalent Ni(1), two equivalent Ni(2), and four equivalent Ga(1) atoms. Both Ni(1)-Ni(1) bond lengths are 2.76 Å. Both Ni(1)-Ni(2) bond lengths are 2.46 Å. All Ni(1)-Ga(1) bond lengths are 2.42 Å. In the second Ni site, Ni(2) is bonded to four equivalent Y(2), four equivalent Ni(1), and four equivalent Ga(1) atoms to form a mixture of face and corner-sharing NiY4Ga4Ni4 cuboctahedra. All Ni(2)-Ga(1) bond lengths are 2.53 Å. Ga(1) is bonded in a 8-coordinate geometry to two equivalent Y(2), two equivalent Ni(2), and four equivalent Ni(1) atoms.