Results for “As-Pd-Sm” | Engineering Papers

DOE OSTI2020

Materials Data on Sm(AsPd)2 by Materials Project

Sm(PdAs)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sm2+ is bonded to eight equivalent As3- atoms to form SmAs8 hexagonal bipyramids that share corners with sixteen equivalent PdAs4 tetrahedra, edges with four equivalent SmAs8 hexagonal bipyramids, edges with eight equivalent PdAs4 tetrahedra, and faces with four equivalent SmAs8 hexagonal bipyramids. All Sm–As bond lengths are 3.27 Å. Pd2+ is bonded to four equivalent As3- atoms to form PdAs4 tetrahedra that share corners with eight equivalent SmAs8 hexagonal bipyramids, corners with four equivalent PdAs4 tetrahedra, edges with four equivalent SmAs8 hexagonal bipyramids, and edges with four equivalent PdAs4 tetrahedra. All Pd–As bond lengths are 2.55 Å. As3- is bonded in a 9-coordinate geometry to four equivalent Sm2+, four equivalent Pd2+, and one As3- atom. The As–As bond length is 2.50 Å.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on SmAsPd by Materials Project

SmPdAs crystallizes in the hexagonal P6_3mc space group. The structure is three-dimensional. Sm is bonded to six equivalent Pd and six equivalent As atoms to form a mixture of distorted edge and face-sharing SmAs6Pd6 cuboctahedra. There are three shorter (3.08 Å) and three longer (3.26 Å) Sm–Pd bond lengths. There are three shorter (3.08 Å) and three longer (3.26 Å) Sm–As bond lengths. Pd is bonded in a 9-coordinate geometry to six equivalent Sm and three equivalent As atoms. All Pd–As bond lengths are 2.54 Å. As is bonded in a 9-coordinate geometry to six equivalent Sm and three equivalent Pd atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on SmAs2Pd3 by Materials Project

SmPd3As2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Sm sites. In the first Sm site, Sm is bonded in a 11-coordinate geometry to eleven Pd and six As atoms. There are a spread of Sm–Pd bond distances ranging from 3.22–3.63 Å. There are a spread of Sm–As bond distances ranging from 3.12–3.25 Å. In the second Sm site, Sm is bonded to six Pd and six As atoms to form SmAs6Pd6 cuboctahedra that share edges with four equivalent PdSm4As4Pd4 cuboctahedra and faces with two equivalent SmAs6Pd6 cuboctahedra. There are four shorter (3.15 Å) and two longer (3.18 Å) Sm–Pd bond lengths. All Sm–As bond lengths are 3.19 Å. There are five inequivalent Pd sites. In the first Pd site, Pd is bonded in a 12-coordinate geometry to three Sm, five Pd, and four As atoms. There are a spread of Pd–Pd bond distances ranging from 2.87–2.98 Å. There are two shorter (2.56 Å) and two longer (2.65 Å) Pd–As bond lengths. In the second Pd site, Pd is bonded in a 12-coordinate geometry to three equivalent Sm, five Pd, and four As atoms. There are two shorter (2.95 Å) and two longer (2.96 Å) Pd–Pd bond lengths. There are a spread of Pd–As bond distances ranging from 2.42–2.69 Å. In the third Pd site, Pd is bonded in a 12-coordinate geometry to three Sm, five Pd, and four As atoms. The Pd–Pd bond length is 2.79 Å. There are a spread of Pd–As bond distances ranging from 2.50–2.75 Å. In the fourth Pd site, Pd is bonded to four equivalent Sm, four equivalent Pd, and four As atoms to form distorted PdSm4As4Pd4 cuboctahedra that share edges with four equivalent SmAs6Pd6 cuboctahedra and faces with two equivalent PdSm4As4Pd4 cuboctahedra. There are two shorter (2.46 Å) and two longer (2.75 Å) Pd–As bond lengths. In the fifth Pd site, Pd is bonded in a 12-coordinate geometry to three equivalent Sm, one Pd, and four As atoms. There are a spread of Pd–As bond distances ranging from 2.49–2.60 Å. There are three inequivalent As sites. In the first As site, As is bonded in a 9-coordinate geometry to three Sm and six Pd atoms. In the second As site, As is bonded in a 9-coordinate geometry to four Sm and five Pd atoms. In the third As site, As is bonded in a 9-coordinate geometry to two equivalent Sm and seven Pd atoms.

36 MATERIALS SCIENCE↗