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GdSi2 is hexagonal omega structure structured and crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Gd is bonded to twelve equivalent Si atoms to form a mixture of edge and face-sharing GdSi12 cuboctahedra. All Gd–Si bond lengths are 3.10 Å. Si is bonded in a 9-coordinate geometry to six equivalent Gd and three equivalent Si atoms. All Si–Si bond lengths are 2.36 Å.
GdSi2 is hexagonal omega structure-like structured and crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Gd is bonded to twelve equivalent Si atoms to form a mixture of edge and face-sharing GdSi12 cuboctahedra. There are eight shorter (3.11 Å) and four longer (3.13 Å) Gd–Si bond lengths. Si is bonded in a 9-coordinate geometry to six equivalent Gd and three equivalent Si atoms. There are two shorter (2.36 Å) and one longer (2.37 Å) Si–Si bond lengths.
GdSi crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Gd is bonded in a 7-coordinate geometry to seven equivalent Si atoms. There are a spread of Gd–Si bond distances ranging from 2.99–3.18 Å. Si is bonded in a 9-coordinate geometry to seven equivalent Gd and two equivalent Si atoms. Both Si–Si bond lengths are 2.49 Å.
Gd5Si4 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are twenty inequivalent Gd sites. In the first Gd site, Gd is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Gd–Si bond distances ranging from 3.07–3.16 Å. In the second Gd site, Gd is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Gd–Si bond distances ranging from 3.09–3.18 Å. In the third Gd site, Gd is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Gd–Si bond distances ranging from 3.09–3.18 Å. In the fourth Gd site, Gd is bonded in a 6-coordinate geometry to seven Si atoms. There are a spread of Gd–Si bond distances ranging from 3.08–3.73 Å. In the fifth Gd site, Gd is bonded in a 6-coordinate geometry to seven Si atoms. There are a spread of Gd–Si bond distances ranging from 3.08–3.73 Å. In the sixth Gd site, Gd is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Gd–Si bond distances ranging from 3.08–3.18 Å. In the seventh Gd site, Gd is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Gd–Si bond distances ranging from 3.07–3.16 Å. In the eighth Gd site, Gd is bonded in a 6-coordinate geometry to seven Si atoms. There are a spread of Gd–Si bond distances ranging from 3.08–3.73 Å. In the ninth Gd site, Gd is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Gd–Si bond distances ranging from 2.88–3.05 Å. In the tenth Gd site, Gd is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Gd–Si bond distances ranging from 2.90–3.05 Å. In the eleventh Gd site, Gd is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Gd–Si bond distances ranging from 2.88–3.06 Å. In the twelfth Gd site, Gd is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Gd–Si bond distances ranging from 2.89–3.06 Å. In the thirteenth Gd site, Gd is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Gd–Si bond distances ranging from 2.88–3.06 Å. In the fourteenth Gd site, Gd is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Gd–Si bond distances ranging from 2.89–3.06 Å. In the fifteenth Gd site, Gd is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Gd–Si bond distances ranging from 2.91–3.04 Å. In the sixteenth Gd site, Gd is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Gd–Si bond distances ranging from 2.88–3.06 Å. In the seventeenth Gd site, Gd is bonded to six Si atoms to form distorted corner-sharing GdSi6 octahedra. The corner-sharing octahedra tilt angles range from 56–57°. There are a spread of Gd–Si bond distances ranging from 2.95–3.32 Å. In the eighteenth Gd site, Gd is bonded to six Si atoms to form distorted corner-sharing GdSi6 octahedra. The corner-sharing octahedra tilt angles range from 56–57°. There are a spread of Gd–Si bond distances ranging from 2.96–3.31 Å. In the nineteenth Gd site, Gd is bonded to six Si atoms to form distorted corner-sharing GdSi6 octahedra. The corner-sharing octahedra tilt angles range from 56–57°. There are a spread of Gd–Si bond distances ranging from 2.95–3.34 Å. In the twentieth Gd site, Gd is bonded to six Si atoms to form distorted corner-sharing GdSi6 octahedra. The corner-sharing octahedra tilt angles range from 56–57°. There are a spread of Gd–Si bond distances ranging from 2.94–3.33 Å. There are sixteen inequivalent Si sites. In the first Si site, Si is bonded in a 9-coordinate geometry to eight Gd and one Si atom. The Si–Si bond length is 2.50 Å. In the second Si site, Si is bonded in a 9-coordinate geometry to seven Gd and one Si atom. The Si–Si bond length is 2.50 Å. In the third Si site, Si is bonded in a 9-coordinate geometry to seven Gd and one Si atom. The Si–Si bond length is 2.50 Å. In the fourth Si site, Si is bonded in a 9-coordinate geometry to seven Gd and one Si atom. The Si–Si bond length is 2.49 Å. In the fifth Si site, Si is bonded in a 9-coordinate geometry to eight Gd and one Si atom. In the sixth Si site, Si is bonded in a 8-coordinate geometry to seven Gd and one Si atom. In the seventh Si site, Si is bonded in a 9-coordinate geometry to seven Gd and one Si atom. In the eighth Si site, Si is bonded in a 9-coordinate geometry to eight Gd and one Si atom. In the ninth Si site, Si is bonded in a 9-coordinate geometry to eight Gd and one Si atom. The Si–Si bond length is 2.50 Å. In the tenth Si site, Si is bonded in a 9-coordinate geometry to eight Gd and one Si atom. The Si–Si bond length is 2.50 Å. In the eleventh Si site, Si is bonded in a 9-coordinate geometry to eight Gd and one Si atom. The Si–Si bond length is 2.50 Å. In the twelfth Si site, Si is bonded in a 9-coordinate geometry to eight Gd and one Si atom. The Si–Si bond length is 2.51 Å. In the thirteenth Si site, Si is bonded in a 9-coordinate geometry to eight Gd and one Si atom. In the fourteenth Si site, Si is bonded in a 9-coordinate geometry to eight Gd and one Si atom. In the fifteenth Si site, Si is bonded in a 9-coordinate geometry to eight Gd and one Si atom. In the sixteenth Si site, Si is bonded in a 9-coordinate geometry to eight Gd and one Si atom.