Materials Data on Hf3TaCo8 by Materials Project
Hf3TaCo8 is Hexagonal Laves-derived structured and crystallizes in the trigonal R3m space group. The structure is three-dimensional. there are three inequivalent Hf sites. In the first Hf site, Hf is bonded in a 12-coordinate geometry to four Hf and twelve Co atoms. There are three shorter (2.97 Å) and one longer (3.00 Å) Hf–Hf bond lengths. There are a spread of Hf–Co bond distances ranging from 2.84–2.86 Å. In the second Hf site, Hf is bonded in a 12-coordinate geometry to three equivalent Hf, one Ta, and twelve Co atoms. The Hf–Ta bond length is 2.93 Å. There are a spread of Hf–Co bond distances ranging from 2.83–2.89 Å. In the third Hf site, Hf is bonded in a 12-coordinate geometry to one Hf, three equivalent Ta, and twelve Co atoms. All Hf–Ta bond lengths are 2.96 Å. There are a spread of Hf–Co bond distances ranging from 2.79–2.84 Å. Ta is bonded in a 12-coordinate geometry to four Hf and twelve Co atoms. There are nine shorter (2.82 Å) and three longer (2.84 Å) Ta–Co bond lengths. There are four inequivalent Co sites. In the first Co site, Co is bonded to four Hf, two equivalent Ta, and six Co atoms to form a mixture of face, edge, and corner-sharing CoHf4Ta2Co6 cuboctahedra. There are a spread of Co–Co bond distances ranging from 2.40–2.43 Å. In the second Co site, Co is bonded to five Hf, one Ta, and six Co atoms to form a mixture of face, edge, and corner-sharing CoHf5TaCo6 cuboctahedra. There are a spread of Co–Co bond distances ranging from 2.40–2.44 Å. In the third Co site, Co is bonded to three equivalent Hf, three equivalent Ta, and six Co atoms to form CoHf3Ta3Co6 cuboctahedra that share corners with eighteen CoHf4Ta2Co6 cuboctahedra, edges with six equivalent CoHf3Ta3Co6 cuboctahedra, and faces with eighteen CoHf4Ta2Co6 cuboctahedra. In the fourth Co site, Co is bonded to six Hf and six Co atoms to form CoHf6Co6 cuboctahedra that share corners with eighteen CoHf4Ta2Co6 cuboctahedra, edges with six equivalent CoHf6Co6 cuboctahedra, and faces with eighteen CoHf4Ta2Co6 cuboctahedra.