Gd3Ni6Si2 crystallizes in the cubic Im-3m space group. Gd(1) is bonded in a 12-coordinate geometry to eight equivalent Ni(1) and four equivalent Si(1) atoms. Ni(1) is bonded in a 10-coordinate geometry to four equivalent Gd(1), four equivalent Ni(1), and two equivalent Si(1) atoms. Si(1) is bonded to six equivalent Gd(1) and six equivalent Ni(1) atoms to form a mixture of corner and face-sharing SiGd6Ni6 cuboctahedra.
Gd3Ni6Si2 crystallizes in the cubic Im-3m space group. Gd(1) is bonded in a 12-coordinate geometry to eight equivalent Ni(1) and four equivalent Si(1) atoms. There are four shorter (2.84 Å) and four longer (2.95 Å) Gd(1)-Ni(1) bond lengths. All Gd(1)-Si(1) bond lengths are 3.14 Å. Ni(1) is bonded in a 10-coordinate geometry to four equivalent Gd(1), four equivalent Ni(1), and two equivalent Si(1) atoms. All Ni(1)-Ni(1) bond lengths are 2.55 Å. Both Ni(1)-Si(1) bond lengths are 2.43 Å. Si(1) is bonded to six equivalent Gd(1) and six equivalent Ni(1) atoms to form a mixture of corner and face-sharing SiGd6Ni6 cuboctahedra.