YNi2Ga3 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 18-coordinate geometry to four equivalent Ni(1), eight equivalent Ni(2), two equivalent Ga(1), and four equivalent Ga(2) atoms. In the second Y site, Y(2) is bonded in a 18-coordinate geometry to two equivalent Ni(1), four equivalent Ni(2), two equivalent Ga(1), two equivalent Ga(3), four equivalent Ga(2), and four equivalent Ga(4) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 12-coordinate geometry to two equivalent Y(1), two equivalent Y(2), two equivalent Ni(2), two equivalent Ga(3), and four equivalent Ga(2) atoms. In the second Ni site, Ni(2) is bonded in a 12-coordinate geometry to two equivalent Y(1), two equivalent Y(2), one Ni(1), one Ni(2), two equivalent Ga(1), two equivalent Ga(2), and two equivalent Ga(4) atoms. There are four inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to one Y(1), two equivalent Y(2), four equivalent Ni(2), and two equivalent Ga(4) atoms. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to one Y(1), two equivalent Y(2), two equivalent Ni(1), two equivalent Ni(2), one Ga(3), and one Ga(4) atom. In the third Ga site, Ga(3) is bonded to four equivalent Y(2), four equivalent Ni(1), and four equivalent Ga(2) atoms to form a mixture of corner and face-sharing GaY4Ga4Ni4 cuboctahedra. In the fourth Ga site, Ga(4) is bonded to four equivalent Y(2), four equivalent Ni(2), two equivalent Ga(1), and two equivalent Ga(2) atoms to form a mixture of corner and face-sharing GaY4Ga4Ni4 cuboctahedra.
YNi2Ga3 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 18-coordinate geometry to four equivalent Ni(1), eight equivalent Ni(2), two equivalent Ga(1), and four equivalent Ga(2) atoms. All Y(1)-Ni(1) bond lengths are 3.31 Å. All Y(1)-Ni(2) bond lengths are 3.30 Å. Both Y(1)-Ga(1) bond lengths are 2.99 Å. All Y(1)-Ga(2) bond lengths are 2.99 Å. In the second Y site, Y(2) is bonded in a 18-coordinate geometry to two equivalent Ni(1), four equivalent Ni(2), two equivalent Ga(1), two equivalent Ga(3), four equivalent Ga(2), and four equivalent Ga(4) atoms. Both Y(2)-Ni(1) bond lengths are 3.35 Å. All Y(2)-Ni(2) bond lengths are 3.35 Å. Both Y(2)-Ga(1) bond lengths are 3.07 Å. Both Y(2)-Ga(3) bond lengths are 3.31 Å. All Y(2)-Ga(2) bond lengths are 3.08 Å. All Y(2)-Ga(4) bond lengths are 3.30 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 12-coordinate geometry to two equivalent Y(1), two equivalent Y(2), two equivalent Ni(2), two equivalent Ga(3), and four equivalent Ga(2) atoms. Both Ni(1)-Ni(2) bond lengths are 2.70 Å. Both Ni(1)-Ga(3) bond lengths are 2.74 Å. All Ni(1)-Ga(2) bond lengths are 2.42 Å. In the second Ni site, Ni(2) is bonded in a 12-coordinate geometry to two equivalent Y(1), two equivalent Y(2), one Ni(1), one Ni(2), two equivalent Ga(1), two equivalent Ga(2), and two equivalent Ga(4) atoms. The Ni(2)-Ni(2) bond length is 2.70 Å. Both Ni(2)-Ga(1) bond lengths are 2.42 Å. Both Ni(2)-Ga(2) bond lengths are 2.42 Å. Both Ni(2)-Ga(4) bond lengths are 2.75 Å. There are four inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to one Y(1), two equivalent Y(2), four equivalent Ni(2), and two equivalent Ga(4) atoms. Both Ga(1)-Ga(4) bond lengths are 2.57 Å. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to one Y(1), two equivalent Y(2), two equivalent Ni(1), two equivalent Ni(2), one Ga(3), and one Ga(4) atom. The Ga(2)-Ga(3) bond length is 2.57 Å. The Ga(2)-Ga(4) bond length is 2.58 Å. In the third Ga site, Ga(3) is bonded to four equivalent Y(2), four equivalent Ni(1), and four equivalent Ga(2) atoms to form a mixture of corner and face-sharing GaY4Ga4Ni4 cuboctahedra. In the fourth Ga site, Ga(4) is bonded to four equivalent Y(2), four equivalent Ni(2), two equivalent Ga(1), and two equivalent Ga(2) atoms to form a mixture of corner and face-sharing GaY4Ga4Ni4 cuboctahedra.