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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on HfGeMo by Materials Project

HfMoGe crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Hf is bonded in a 9-coordinate geometry to four equivalent Mo and five equivalent Ge atoms. There are two shorter (2.99 Å) and two longer (3.13 Å) Hf–Mo bond lengths. There are a spread of Hf–Ge bond distances ranging from 2.77–2.94 Å. Mo is bonded in a 12-coordinate geometry to four equivalent Hf and four equivalent Ge atoms. There are a spread of Mo–Ge bond distances ranging from 2.57–2.72 Å. Ge is bonded in a 9-coordinate geometry to five equivalent Hf and four equivalent Mo atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf3GeMo8 by Materials Project

Hf3Mo8Ge is Hexagonal Laves-derived structured and crystallizes in the trigonal P3m1 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 twelve Mo and three equivalent Ge atoms. There are a spread of Hf–Mo bond distances ranging from 3.03–3.14 Å. All Hf–Ge bond lengths are 3.27 Å. In the second Hf site, Hf is bonded in a 12-coordinate geometry to twelve Mo atoms. There are three shorter (3.10 Å) and nine longer (3.14 Å) Hf–Mo bond lengths. In the third Hf site, Hf is bonded in a 12-coordinate geometry to twelve Mo and one Ge atom. There are a spread of Hf–Mo bond distances ranging from 3.08–3.15 Å. The Hf–Ge bond length is 3.22 Å. There are four inequivalent Mo sites. In the first Mo site, Mo is bonded to three equivalent Hf, six Mo, and three equivalent Ge atoms to form MoHf3Ge3Mo6 cuboctahedra that share corners with twelve MoHf4Ge2Mo6 cuboctahedra, edges with six equivalent MoHf3Ge3Mo6 cuboctahedra, and faces with twenty MoHf6Mo6 cuboctahedra. There are three shorter (2.65 Å) and three longer (2.67 Å) Mo–Mo bond lengths. All Mo–Ge bond lengths are 3.15 Å. In the second Mo site, Mo is bonded to six Hf and six Mo atoms to form MoHf6Mo6 cuboctahedra that share corners with twelve MoHf5GeMo6 cuboctahedra, edges with six equivalent MoHf6Mo6 cuboctahedra, and faces with twenty MoHf3Ge3Mo6 cuboctahedra. There are three shorter (2.68 Å) and three longer (2.70 Å) Mo–Mo bond lengths. In the third Mo site, Mo is bonded to four Hf, six Mo, and two equivalent Ge atoms to form MoHf4Ge2Mo6 cuboctahedra that share corners with eighteen MoHf3Ge3Mo6 cuboctahedra, edges with six MoHf5GeMo6 cuboctahedra, and faces with eighteen MoHf3Ge3Mo6 cuboctahedra. There are two shorter (2.60 Å) and two longer (2.75 Å) Mo–Mo bond lengths. Both Mo–Ge bond lengths are 3.10 Å. In the fourth Mo site, Mo is bonded to five Hf, six Mo, and one Ge atom to form MoHf5GeMo6 cuboctahedra that share corners with eighteen MoHf3Ge3Mo6 cuboctahedra, edges with six MoHf4Ge2Mo6 cuboctahedra, and faces with eighteen MoHf3Ge3Mo6 cuboctahedra. There are two shorter (2.62 Å) and two longer (2.74 Å) Mo–Mo bond lengths. The Mo–Ge bond length is 3.09 Å. Ge is bonded in a 4-coordinate geometry to four Hf and twelve Mo atoms.

36 MATERIALS SCIENCE↗