Materials Data on Gd3Al7Ag2 by Materials Project
Gd3Ag2Al7 is Frank-Kasper $\mu$ Phase-derived structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are two inequivalent Gd sites. In the first Gd site, Gd is bonded in a 12-coordinate geometry to twelve Al atoms. There are a spread of Gd–Al bond distances ranging from 3.19–3.29 Å. In the second Gd site, Gd is bonded in a distorted hexagonal planar geometry to six equivalent Ag and twelve equivalent Al atoms. All Gd–Ag bond lengths are 3.22 Å. All Gd–Al bond lengths are 3.56 Å. Ag is bonded in a 9-coordinate geometry to three equivalent Gd and six equivalent Al atoms. There are three shorter (2.71 Å) and three longer (2.78 Å) Ag–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 12-coordinate geometry to five Gd, two equivalent Ag, and five Al atoms. There are three shorter (2.74 Å) and two longer (2.84 Å) Al–Al bond lengths. In the second Al site, Al is bonded to six equivalent Gd and six equivalent Al atoms to form edge-sharing AlGd6Al6 cuboctahedra.