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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on PmHf by Materials Project

PmHf crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Pm is bonded to six equivalent Pm and six equivalent Hf atoms to form PmPm6Hf6 cuboctahedra that share corners with eighteen equivalent PmPm6Hf6 cuboctahedra, edges with six equivalent PmPm6Hf6 cuboctahedra, edges with twelve equivalent HfPm6Hf6 cuboctahedra, faces with eight equivalent PmPm6Hf6 cuboctahedra, and faces with twelve equivalent HfPm6Hf6 cuboctahedra. All Pm–Pm bond lengths are 3.37 Å. All Pm–Hf bond lengths are 3.39 Å. Hf is bonded to six equivalent Pm and six equivalent Hf atoms to form HfPm6Hf6 cuboctahedra that share corners with eighteen equivalent HfPm6Hf6 cuboctahedra, edges with six equivalent HfPm6Hf6 cuboctahedra, edges with twelve equivalent PmPm6Hf6 cuboctahedra, faces with eight equivalent HfPm6Hf6 cuboctahedra, and faces with twelve equivalent PmPm6Hf6 cuboctahedra. All Hf–Hf bond lengths are 3.37 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pm3Hf by Materials Project

Pm3Hf is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Pm sites. In the first Pm site, Pm is bonded to eight Pm and four equivalent Hf atoms to form PmPm8Hf4 cuboctahedra that share corners with twelve equivalent PmPm8Hf4 cuboctahedra, edges with eight equivalent HfPm12 cuboctahedra, edges with sixteen PmPm8Hf4 cuboctahedra, faces with four equivalent HfPm12 cuboctahedra, and faces with fourteen PmPm8Hf4 cuboctahedra. All Pm–Pm bond lengths are 3.51 Å. All Pm–Hf bond lengths are 3.51 Å. In the second Pm site, Pm is bonded to eight equivalent Pm and four equivalent Hf atoms to form PmPm8Hf4 cuboctahedra that share corners with four equivalent PmPm8Hf4 cuboctahedra, corners with eight equivalent HfPm12 cuboctahedra, edges with twenty-four PmPm8Hf4 cuboctahedra, faces with six equivalent HfPm12 cuboctahedra, and faces with twelve PmPm8Hf4 cuboctahedra. All Pm–Hf bond lengths are 3.51 Å. Hf is bonded to twelve Pm atoms to form HfPm12 cuboctahedra that share corners with four equivalent HfPm12 cuboctahedra, corners with eight equivalent PmPm8Hf4 cuboctahedra, edges with eight equivalent HfPm12 cuboctahedra, edges with sixteen equivalent PmPm8Hf4 cuboctahedra, faces with four equivalent HfPm12 cuboctahedra, and faces with fourteen PmPm8Hf4 cuboctahedra.

36 MATERIALS SCIENCE↗