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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on U(SiPt)2 by Materials Project

UPt2Si2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. U4+ is bonded in a 8-coordinate geometry to eight Pt2- atoms. There are four shorter (3.20 Å) and four longer (3.27 Å) U–Pt bond lengths. There are two inequivalent Pt2- sites. In the first Pt2- site, Pt2- is bonded in a 5-coordinate geometry to four equivalent U4+ and five Si atoms. There are one shorter (2.39 Å) and four longer (2.42 Å) Pt–Si bond lengths. In the second Pt2- site, Pt2- is bonded to four equivalent U4+ and four equivalent Si atoms to form a mixture of distorted edge and face-sharing PtU4Si4 tetrahedra. All Pt–Si bond lengths are 2.49 Å. There are two inequivalent Si sites. In the first Si site, Si is bonded to four equivalent Pt2- atoms to form a mixture of edge and corner-sharing SiPt4 tetrahedra. In the second Si site, Si is bonded in a 5-coordinate geometry to five Pt2- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on U(SiPt)2 by Materials Project

UPt2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. U4+ is bonded in a 8-coordinate geometry to eight equivalent Pt2- atoms. All U–Pt bond lengths are 3.29 Å. Pt2- is bonded to four equivalent U4+ and four equivalent Si atoms to form a mixture of distorted corner, edge, and face-sharing PtU4Si4 tetrahedra. All Pt–Si bond lengths are 2.49 Å. Si is bonded in a 5-coordinate geometry to four equivalent Pt2- and one Si atom. The Si–Si bond length is 2.30 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on U3Si11Pt23 by Materials Project

U3Pt23Si11 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. U+3.33+ is bonded in a 8-coordinate geometry to four equivalent U+3.33+ and four equivalent Pt2- atoms. All U–U bond lengths are 2.82 Å. All U–Pt bond lengths are 3.08 Å. There are four inequivalent Pt2- sites. In the first Pt2- site, Pt2- is bonded in a 3-coordinate geometry to one U+3.33+, two equivalent Pt2-, and three Si+3.27+ atoms. Both Pt–Pt bond lengths are 3.19 Å. There are a spread of Pt–Si bond distances ranging from 2.43–2.48 Å. In the second Pt2- site, Pt2- is bonded to four Si+3.27+ atoms to form a mixture of distorted edge and corner-sharing PtSi4 tetrahedra. There are one shorter (2.28 Å) and three longer (2.51 Å) Pt–Si bond lengths. In the third Pt2- site, Pt2- is bonded in a body-centered cubic geometry to eight equivalent Pt2- atoms. In the fourth Pt2- site, Pt2- is bonded to four Si+3.27+ atoms to form a mixture of edge and corner-sharing PtSi4 tetrahedra. There are one shorter (2.45 Å) and three longer (2.49 Å) Pt–Si bond lengths. There are three inequivalent Si+3.27+ sites. In the first Si+3.27+ site, Si+3.27+ is bonded in a distorted tetrahedral geometry to four Pt2- atoms. In the second Si+3.27+ site, Si+3.27+ is bonded in a body-centered cubic geometry to eight Pt2- atoms. In the third Si+3.27+ site, Si+3.27+ is bonded in a 7-coordinate geometry to seven Pt2- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on U6Si19Pt30 by Materials Project

U6Pt30Si19 crystallizes in the trigonal P-3 space group. The structure is three-dimensional. U4+ is bonded in a 6-coordinate geometry to six Pt2- atoms. There are a spread of U–Pt bond distances ranging from 3.09–3.13 Å. There are five inequivalent Pt2- sites. In the first Pt2- site, Pt2- is bonded in a 2-coordinate geometry to two equivalent U4+ and four Si+1.89+ atoms. There are a spread of Pt–Si bond distances ranging from 2.38–2.67 Å. In the second Pt2- site, Pt2- is bonded to four Si+1.89+ atoms to form a mixture of distorted corner and edge-sharing PtSi4 tetrahedra. There are a spread of Pt–Si bond distances ranging from 2.43–2.57 Å. In the third Pt2- site, Pt2- is bonded in a 2-coordinate geometry to two equivalent U4+ and four Si+1.89+ atoms. There are a spread of Pt–Si bond distances ranging from 2.40–2.67 Å. In the fourth Pt2- site, Pt2- is bonded in a 5-coordinate geometry to five Si+1.89+ atoms. There are a spread of Pt–Si bond distances ranging from 2.46–2.64 Å. In the fifth Pt2- site, Pt2- is bonded in a 4-coordinate geometry to two equivalent U4+ and four Si+1.89+ atoms. There are a spread of Pt–Si bond distances ranging from 2.40–2.60 Å. There are four inequivalent Si+1.89+ sites. In the first Si+1.89+ site, Si+1.89+ is bonded in a 7-coordinate geometry to seven Pt2- atoms. In the second Si+1.89+ site, Si+1.89+ is bonded in a 6-coordinate geometry to six Pt2- atoms. In the third Si+1.89+ site, Si+1.89+ is bonded in a 7-coordinate geometry to seven Pt2- atoms. In the fourth Si+1.89+ site, Si+1.89+ is bonded in a distorted octahedral geometry to six equivalent Pt2- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on U3SiPt5 by Materials Project

U3Pt5Si crystallizes in the orthorhombic Ima2 space group. The structure is three-dimensional. there are two inequivalent U+4.67+ sites. In the first U+4.67+ site, U+4.67+ is bonded in a 9-coordinate geometry to ten Pt2- and one Si4- atom. There are a spread of U–Pt bond distances ranging from 2.93–3.47 Å. The U–Si bond length is 3.27 Å. In the second U+4.67+ site, U+4.67+ is bonded in a 6-coordinate geometry to seven Pt2- and one Si4- atom. There are a spread of U–Pt bond distances ranging from 2.86–3.30 Å. The U–Si bond length is 2.96 Å. There are three inequivalent Pt2- sites. In the first Pt2- site, Pt2- is bonded in a 6-coordinate geometry to five U+4.67+, two equivalent Pt2-, and one Si4- atom. There are one shorter (2.87 Å) and one longer (2.92 Å) Pt–Pt bond lengths. The Pt–Si bond length is 2.54 Å. In the second Pt2- site, Pt2- is bonded in a 11-coordinate geometry to six U+4.67+, four Pt2-, and one Si4- atom. There are one shorter (2.84 Å) and one longer (2.94 Å) Pt–Pt bond lengths. The Pt–Si bond length is 2.55 Å. In the third Pt2- site, Pt2- is bonded in a 5-coordinate geometry to five U+4.67+, two equivalent Pt2-, and two equivalent Si4- atoms. There are one shorter (2.40 Å) and one longer (2.53 Å) Pt–Si bond lengths. Si4- is bonded in a 7-coordinate geometry to three U+4.67+ and six Pt2- atoms.

36 MATERIALS SCIENCE↗