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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Th(SiIr)2 by Materials Project

Th(IrSi)2 crystallizes in the tetragonal I4mm space group. The structure is three-dimensional. Th is bonded in a 8-coordinate geometry to eight Ir and eight equivalent Si atoms. There are four shorter (3.27 Å) and four longer (3.29 Å) Th–Ir bond lengths. There are four shorter (3.27 Å) and four longer (3.29 Å) Th–Si bond lengths. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 9-coordinate geometry to four equivalent Th and four equivalent Si atoms. All Ir–Si bond lengths are 2.43 Å. In the second Ir site, Ir is bonded in a 9-coordinate geometry to four equivalent Th and four equivalent Si atoms. All Ir–Si bond lengths are 2.42 Å. Si is bonded in a 4-coordinate geometry to four equivalent Th and four Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ThSi3Ir by Materials Project

ThIrSi3 crystallizes in the tetragonal I4mm space group. The structure is three-dimensional. Th is bonded in a 12-coordinate geometry to five equivalent Ir and twelve Si atoms. There are one shorter (3.35 Å) and four longer (3.39 Å) Th–Ir bond lengths. There are a spread of Th–Si bond distances ranging from 3.13–3.36 Å. Ir is bonded in a 5-coordinate geometry to five equivalent Th and five Si atoms. There are one shorter (2.38 Å) and four longer (2.40 Å) Ir–Si bond lengths. There are two inequivalent Si sites. In the first Si site, Si is bonded in a distorted single-bond geometry to four equivalent Th, one Ir, and four equivalent Si atoms. All Si–Si bond lengths are 2.57 Å. In the second Si site, Si is bonded in a distorted bent 120 degrees geometry to four equivalent Th, two equivalent Ir, and two equivalent Si atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Th2Si3Ir by Materials Project

Th2IrSi3 crystallizes in the orthorhombic Imm2 space group. The structure is three-dimensional. there are two inequivalent Th4+ sites. In the first Th4+ site, Th4+ is bonded in a 8-coordinate geometry to eight Si4- atoms. There are six shorter (3.16 Å) and two longer (3.17 Å) Th–Si bond lengths. In the second Th4+ site, Th4+ is bonded in a 10-coordinate geometry to ten Si4- atoms. There are eight shorter (3.18 Å) and two longer (3.21 Å) Th–Si bond lengths. Ir4+ is bonded in a trigonal planar geometry to three Si4- atoms. There are one shorter (2.38 Å) and two longer (2.41 Å) Ir–Si bond lengths. There are three inequivalent Si4- sites. In the first Si4- site, Si4- is bonded in a 2-coordinate geometry to six Th4+, two equivalent Ir4+, and one Si4- atom. The Si–Si bond length is 2.38 Å. In the second Si4- site, Si4- is bonded in a 1-coordinate geometry to six Th4+, one Ir4+, and two equivalent Si4- atoms. Both Si–Si bond lengths are 2.39 Å. In the third Si4- site, Si4- is bonded in a 9-coordinate geometry to six Th4+ and three Si4- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ThSiIr by Materials Project

ThIrSi is hexagonal omega structure-derived structured and crystallizes in the tetragonal I4_1md space group. The structure is three-dimensional. Th is bonded to six Ir and six equivalent Si atoms to form a mixture of edge and face-sharing ThSi6Ir6 cuboctahedra. There are two shorter (3.11 Å) and four longer (3.24 Å) Th–Ir bond lengths. There are four shorter (3.17 Å) and two longer (3.26 Å) Th–Si bond lengths. There are three inequivalent Ir sites. In the first Ir site, Ir is bonded in a 3-coordinate geometry to six equivalent Th and three equivalent Si atoms. There are two shorter (2.41 Å) and one longer (2.43 Å) Ir–Si bond lengths. In the second Ir site, Ir is bonded in a 3-coordinate geometry to six equivalent Th and three equivalent Si atoms. There are two shorter (3.11 Å) and four longer (3.24 Å) Ir–Th bond lengths. There are two shorter (2.41 Å) and one longer (2.43 Å) Ir–Si bond lengths. In the third Ir site, Ir is bonded in a 3-coordinate geometry to six equivalent Th and three equivalent Si atoms. There are two shorter (2.41 Å) and one longer (2.43 Å) Ir–Si bond lengths. Si is bonded in a distorted trigonal planar geometry to six equivalent Th and three Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Th(SiIr)2 by Materials Project

Th(IrSi)2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Th is bonded in a 8-coordinate geometry to eight Ir and eight Si atoms. There are four shorter (3.19 Å) and four longer (3.29 Å) Th–Ir bond lengths. There are four shorter (3.21 Å) and four longer (3.23 Å) Th–Si bond lengths. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded to four equivalent Th and four equivalent Si atoms to form distorted IrTh4Si4 tetrahedra that share corners with twelve equivalent SiTh4Ir4 tetrahedra, edges with two equivalent SiTh4Ir4 tetrahedra, edges with four equivalent IrTh4Si4 tetrahedra, and faces with four equivalent IrTh4Si4 tetrahedra. All Ir–Si bond lengths are 2.47 Å. In the second Ir site, Ir is bonded in a 9-coordinate geometry to four equivalent Th and five Si atoms. There are one shorter (2.42 Å) and four longer (2.45 Å) Ir–Si bond lengths. There are two inequivalent Si sites. In the first Si site, Si is bonded to four equivalent Th and four equivalent Ir atoms to form distorted SiTh4Ir4 tetrahedra that share corners with twelve equivalent IrTh4Si4 tetrahedra, edges with two equivalent IrTh4Si4 tetrahedra, edges with four equivalent SiTh4Ir4 tetrahedra, and faces with four equivalent SiTh4Ir4 tetrahedra. In the second Si site, Si is bonded in a 9-coordinate geometry to four equivalent Th and five Ir atoms.

36 MATERIALS SCIENCE↗