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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on AcPm3 by Materials Project

AcPm3 is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ac is bonded to twelve Pm atoms to form AcPm12 cuboctahedra that share corners with four equivalent AcPm12 cuboctahedra, corners with eight equivalent PmAc4Pm8 cuboctahedra, edges with eight equivalent AcPm12 cuboctahedra, edges with sixteen equivalent PmAc4Pm8 cuboctahedra, faces with four equivalent AcPm12 cuboctahedra, and faces with fourteen PmAc4Pm8 cuboctahedra. There are four shorter (3.73 Å) and eight longer (3.74 Å) Ac–Pm bond lengths. There are two inequivalent Pm sites. In the first Pm site, Pm is bonded to four equivalent Ac and eight Pm atoms to form PmAc4Pm8 cuboctahedra that share corners with twelve equivalent PmAc4Pm8 cuboctahedra, edges with eight equivalent AcPm12 cuboctahedra, edges with sixteen PmAc4Pm8 cuboctahedra, faces with four equivalent AcPm12 cuboctahedra, and faces with fourteen PmAc4Pm8 cuboctahedra. There are four shorter (3.73 Å) and four longer (3.74 Å) Pm–Pm bond lengths. In the second Pm site, Pm is bonded to four equivalent Ac and eight equivalent Pm atoms to form PmAc4Pm8 cuboctahedra that share corners with four equivalent PmAc4Pm8 cuboctahedra, corners with eight equivalent AcPm12 cuboctahedra, edges with twenty-four PmAc4Pm8 cuboctahedra, faces with six equivalent AcPm12 cuboctahedra, and faces with twelve PmAc4Pm8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ac3Pm by Materials Project

Ac3Pm is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ac is bonded to eight equivalent Ac and four equivalent Pm atoms to form AcAc8Pm4 cuboctahedra that share corners with four equivalent PmAc12 cuboctahedra, corners with fourteen equivalent AcAc8Pm4 cuboctahedra, edges with six equivalent PmAc12 cuboctahedra, edges with twelve equivalent AcAc8Pm4 cuboctahedra, faces with four equivalent PmAc12 cuboctahedra, and faces with sixteen equivalent AcAc8Pm4 cuboctahedra. There are a spread of Ac–Ac bond distances ranging from 3.88–3.96 Å. There are two shorter (3.91 Å) and two longer (3.92 Å) Ac–Pm bond lengths. Pm is bonded to twelve equivalent Ac atoms to form PmAc12 cuboctahedra that share corners with six equivalent PmAc12 cuboctahedra, corners with twelve equivalent AcAc8Pm4 cuboctahedra, edges with eighteen equivalent AcAc8Pm4 cuboctahedra, faces with eight equivalent PmAc12 cuboctahedra, and faces with twelve equivalent AcAc8Pm4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AcPm3 by Materials Project

AcPm3 is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ac is bonded to twelve Pm atoms to form AcPm12 cuboctahedra that share corners with six equivalent AcPm12 cuboctahedra, corners with twelve PmAc4Pm8 cuboctahedra, edges with eighteen PmAc4Pm8 cuboctahedra, faces with eight equivalent AcPm12 cuboctahedra, and faces with twelve PmAc4Pm8 cuboctahedra. There are six shorter (3.75 Å) and six longer (3.78 Å) Ac–Pm bond lengths. There are three inequivalent Pm sites. In the first Pm site, Pm is bonded to four equivalent Ac and eight Pm atoms to form PmAc4Pm8 cuboctahedra that share corners with four equivalent AcPm12 cuboctahedra, corners with fourteen PmAc4Pm8 cuboctahedra, edges with six equivalent AcPm12 cuboctahedra, edges with twelve PmAc4Pm8 cuboctahedra, faces with four equivalent AcPm12 cuboctahedra, and faces with sixteen PmAc4Pm8 cuboctahedra. There are a spread of Pm–Pm bond distances ranging from 3.67–3.84 Å. In the second Pm site, Pm is bonded to four equivalent Ac and eight Pm atoms to form PmAc4Pm8 cuboctahedra that share corners with four equivalent AcPm12 cuboctahedra, corners with fourteen PmAc4Pm8 cuboctahedra, edges with six equivalent AcPm12 cuboctahedra, edges with twelve PmAc4Pm8 cuboctahedra, faces with four equivalent AcPm12 cuboctahedra, and faces with sixteen PmAc4Pm8 cuboctahedra. There are a spread of Pm–Pm bond distances ranging from 3.67–3.84 Å. In the third Pm site, Pm is bonded to four equivalent Ac and eight Pm atoms to form PmAc4Pm8 cuboctahedra that share corners with four equivalent AcPm12 cuboctahedra, corners with fourteen PmAc4Pm8 cuboctahedra, edges with six equivalent AcPm12 cuboctahedra, edges with twelve PmAc4Pm8 cuboctahedra, faces with four equivalent AcPm12 cuboctahedra, and faces with sixteen PmAc4Pm8 cuboctahedra. There are one shorter (3.67 Å) and one longer (3.84 Å) Pm–Pm bond lengths.

36 MATERIALS SCIENCE↗