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All sourcesNASA NTRSDOE OSTI
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 SiIr2 by Materials Project

Ir2Si crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Ir sites. In the first Ir site, Ir is bonded to six equivalent Ir and five equivalent Si atoms to form a mixture of distorted corner and face-sharing IrSi5Ir6 trigonal bipyramids. All Ir–Ir bond lengths are 2.79 Å. There are three shorter (2.42 Å) and two longer (2.75 Å) Ir–Si bond lengths. In the second Ir site, Ir is bonded in a 6-coordinate geometry to eight Ir and six equivalent Si atoms. Both Ir–Ir bond lengths are 2.75 Å. All Ir–Si bond lengths are 2.79 Å. Si is bonded in a 11-coordinate geometry to eleven Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y4Si5Ir9 by Materials Project

Y4Ir9Si5 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Y sites. In the first Y site, Y is bonded in a 9-coordinate geometry to one Y and nine equivalent Ir atoms. The Y–Y bond length is 3.32 Å. There are three shorter (3.07 Å) and six longer (3.10 Å) Y–Ir bond lengths. In the second Y site, Y is bonded in a 12-coordinate geometry to two Y, twelve Ir, and six Si atoms. The Y–Y bond length is 3.46 Å. There are six shorter (3.27 Å) and six longer (3.40 Å) Y–Ir bond lengths. All Y–Si bond lengths are 3.21 Å. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 12-coordinate geometry to five Y and three Si atoms. There are two shorter (2.42 Å) and one longer (2.56 Å) Ir–Si bond lengths. In the second Ir site, Ir is bonded in a 4-coordinate geometry to four equivalent Y and four Si atoms. There are two shorter (2.46 Å) and two longer (2.47 Å) Ir–Si bond lengths. There are three inequivalent Si sites. In the first Si site, Si is bonded in a distorted cuboctahedral geometry to six equivalent Ir atoms. In the second Si site, Si is bonded in a 9-coordinate geometry to three equivalent Y and six Ir atoms. In the third Si site, Si is bonded in a 9-coordinate geometry to three equivalent Y and six Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe9B4Ir3 by Materials Project

Fe9Ir3B4 crystallizes in the monoclinic Pm space group. The structure is three-dimensional. there are five inequivalent Fe sites. In the first Fe site, Fe is bonded in a 2-coordinate geometry to three B atoms. There are a spread of Fe–B bond distances ranging from 2.07–2.44 Å. In the second Fe site, Fe is bonded in a 2-coordinate geometry to three B atoms. There are a spread of Fe–B bond distances ranging from 2.11–2.42 Å. In the third Fe site, Fe is bonded in a 2-coordinate geometry to three B atoms. There are a spread of Fe–B bond distances ranging from 2.11–2.36 Å. In the fourth Fe site, Fe is bonded in a 2-coordinate geometry to three B atoms. There are a spread of Fe–B bond distances ranging from 2.11–2.37 Å. In the fifth Fe site, Fe is bonded in a 2-coordinate geometry to three B atoms. There are a spread of Fe–B bond distances ranging from 2.14–2.58 Å. There are three inequivalent Ir sites. In the first Ir site, Ir is bonded in a 2-coordinate geometry to three B atoms. There are a spread of Ir–B bond distances ranging from 2.14–2.59 Å. In the second Ir site, Ir is bonded in a 2-coordinate geometry to three B atoms. There are a spread of Ir–B bond distances ranging from 2.17–2.55 Å. In the third Ir site, Ir is bonded in a 2-coordinate geometry to three B atoms. There are a spread of Ir–B bond distances ranging from 2.14–2.57 Å. There are four inequivalent B sites. In the first B site, B is bonded in a 9-coordinate geometry to seven Fe and two equivalent Ir atoms. In the second B site, B is bonded in a 9-coordinate geometry to eight Fe and one Ir atom. In the third B site, B is bonded in a 9-coordinate geometry to six Fe and three Ir atoms. In the fourth B site, B is bonded in a 9-coordinate geometry to six Fe and three Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ce(SiIr)2 by Materials Project

CeIr2Si2 crystallizes in the tetragonal I4mm space group. The structure is three-dimensional. Ce is bonded in a 8-coordinate geometry to eight Ir and eight equivalent Si atoms. There are four shorter (3.24 Å) and four longer (3.26 Å) Ce–Ir bond lengths. There are four shorter (3.27 Å) and four longer (3.31 Å) Ce–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 Ce, one Ir, and four equivalent Si atoms. The Ir–Ir bond length is 2.65 Å. All Ir–Si bond lengths are 2.42 Å. In the second Ir site, Ir is bonded in a 9-coordinate geometry to four equivalent Ce, one Ir, 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 Ce and four Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LaAsIr by Materials Project

LaIrAs is hexagonal omega structure-derived structured and crystallizes in the tetragonal I4_1md space group. The structure is three-dimensional. La is bonded to six Ir and six equivalent As atoms to form a mixture of edge and face-sharing LaAs6Ir6 cuboctahedra. There are two shorter (3.22 Å) and four longer (3.28 Å) La–Ir bond lengths. There are four shorter (3.21 Å) and two longer (3.35 Å) La–As bond lengths. There are three inequivalent Ir sites. In the first Ir site, Ir is bonded in a 9-coordinate geometry to six equivalent La and three equivalent As atoms. There are two shorter (2.47 Å) and one longer (2.48 Å) Ir–As bond lengths. In the second Ir site, Ir is bonded in a 9-coordinate geometry to six equivalent La and three equivalent As atoms. There are two shorter (2.47 Å) and one longer (2.48 Å) Ir–As bond lengths. In the third Ir site, Ir is bonded in a 9-coordinate geometry to six equivalent La and three equivalent As atoms. There are two shorter (3.22 Å) and four longer (3.28 Å) Ir–La bond lengths. There are two shorter (2.47 Å) and one longer (2.48 Å) Ir–As bond lengths. As is bonded in a 9-coordinate geometry to six equivalent La and three Ir atoms.

36 MATERIALS SCIENCE↗
NASA NTRS1996

Testing of electroformed deposited iridium/powder metallurgy rhenium rockets

High-temperature, oxidation-resistant chamber materials offer the thermal margin for high performance and extended lifetimes for radiation-cooled rockets. Rhenium (Re) coated with iridium (Ir) allow hours of operation at 2200 C on Earth-storable propellants. One process for manufacturing Ir/Re rocket chambers is the fabrication of Re substrates by powder metallurgy (PM) and the application of Ir coatings by using electroformed deposition (ED). ED Ir coatings, however, have been found to be porous and poorly adherent. The integrity of ED Ir coatings could be improved by densification after the electroforming process. This report summarizes the testing of two 22-N, ED Ir/PM Re rocket chambers that were subjected to post-deposition treatments in an effort to densify the Ir coating. One chamber was vacuum annealed, while the other chamber was subjected to hot isostatic pressure (HIP). The chambers were tested on gaseous oxygen/gaseous hydrogen propellants, at mixture ratios that simulated the oxidizing environments of Earth-storable propellants. ne annealed ED Ir/PM Re chamber was tested for a total of 24 firings and 4.58 hr at a mixture ratio of 4.2. After only 9 firings, the annealed ED Ir coating began to blister and spall upstream of the throat. The blistering and spalling were similar to what had been experienced with unannealed, as-deposited ED Ir coatings. The HIP ED Ir/PM Re chamber was tested for a total of 91 firings and 11.45 hr at mixture ratios of 3.2 and 4.2. The HIP ED Ir coating remained adherent to the Re substrate throughout testing; there were no visible signs of coating degradation. Metallography revealed, however, thinning of the HIP Ir coating and occasional pores in the Re layer upstream of the throat. Pinholes in the Ir coating may have provided a path for oxidation of the Re substrate at these locations. The HIP ED Ir coating proved to be more effective than vacuum annealed and as-deposited ED Ir. Further densification is still required to match the integrity of chemically vapor deposited Ir coatings. Despite this, the successful long duration testing of the HIP ED Ir chamber, in an oxidizing environment comparable to Earth-storable propellants, demonstrated the viability of this Ir/Re rocket fabrication process.

Reed, Brian D.↗
DOE OSTI2020

Materials Data on MgIr2 by Materials Project

MgIr2 is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Mg is bonded in a 12-coordinate geometry to twelve Ir atoms. There are six shorter (3.02 Å) and six longer (3.07 Å) Mg–Ir bond lengths. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded to six equivalent Mg and six equivalent Ir atoms to form a mixture of corner, edge, and face-sharing IrMg6Ir6 cuboctahedra. All Ir–Ir bond lengths are 2.62 Å. In the second Ir site, Ir is bonded to six equivalent Mg and six Ir atoms to form a mixture of corner, edge, and face-sharing IrMg6Ir6 cuboctahedra. There are two shorter (2.52 Å) and two longer (2.69 Å) Ir–Ir bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LaIr5 by Materials Project

Ir5La crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. La is bonded in a 6-coordinate geometry to eighteen Ir atoms. There are six shorter (3.11 Å) and twelve longer (3.46 Å) La–Ir bond lengths. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 12-coordinate geometry to three equivalent La and six equivalent Ir atoms. All Ir–Ir bond lengths are 2.67 Å. In the second Ir site, Ir is bonded to four equivalent La and eight Ir atoms to form a mixture of corner, edge, and face-sharing IrLa4Ir8 cuboctahedra. All Ir–Ir bond lengths are 2.70 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mn3SiIr by Materials Project

Mn3IrSi is beta-derived structured and crystallizes in the cubic P2_13 space group. The structure is three-dimensional. there are five inequivalent Mn sites. In the first Mn site, Mn is bonded in a 12-coordinate geometry to six Mn, three equivalent Ir, and three equivalent Si atoms. There are a spread of Mn–Mn bond distances ranging from 2.67–2.77 Å. There are one shorter (2.65 Å) and two longer (2.73 Å) Mn–Ir bond lengths. There are a spread of Mn–Si bond distances ranging from 2.59–2.77 Å. In the second Mn site, Mn is bonded in a 12-coordinate geometry to six Mn, three equivalent Ir, and three equivalent Si atoms. There are one shorter (2.67 Å) and two longer (2.77 Å) Mn–Mn bond lengths. There are one shorter (2.65 Å) and two longer (2.73 Å) Mn–Ir bond lengths. There are a spread of Mn–Si bond distances ranging from 2.59–2.77 Å. In the third Mn site, Mn is bonded in a 12-coordinate geometry to six Mn, three equivalent Ir, and three equivalent Si atoms. There are one shorter (2.70 Å) and one longer (2.77 Å) Mn–Mn bond lengths. There are one shorter (2.65 Å) and two longer (2.73 Å) Mn–Ir bond lengths. There are a spread of Mn–Si bond distances ranging from 2.59–2.77 Å. In the fourth Mn site, Mn is bonded in a 12-coordinate geometry to six Mn, three equivalent Ir, and three equivalent Si atoms. There are a spread of Mn–Mn bond distances ranging from 2.67–2.77 Å. There are one shorter (2.65 Å) and two longer (2.73 Å) Mn–Ir bond lengths. There are a spread of Mn–Si bond distances ranging from 2.59–2.77 Å. In the fifth Mn site, Mn is bonded in a 12-coordinate geometry to six Mn, three equivalent Ir, and three equivalent Si atoms. There are a spread of Mn–Mn bond distances ranging from 2.67–2.77 Å. There are one shorter (2.65 Å) and two longer (2.73 Å) Mn–Ir bond lengths. There are a spread of Mn–Si bond distances ranging from 2.59–2.77 Å. Ir is bonded to nine Mn and three equivalent Si atoms to form IrMn9Si3 cuboctahedra that share corners with six equivalent IrMn9Si3 cuboctahedra, corners with nine equivalent SiMn9Ir3 cuboctahedra, faces with four equivalent SiMn9Ir3 cuboctahedra, and faces with six equivalent IrMn9Si3 cuboctahedra. All Ir–Si bond lengths are 2.42 Å. Si is bonded to nine Mn and three equivalent Ir atoms to form distorted SiMn9Ir3 cuboctahedra that share corners with six equivalent SiMn9Ir3 cuboctahedra, corners with nine equivalent IrMn9Si3 cuboctahedra, faces with four equivalent IrMn9Si3 cuboctahedra, and faces with six equivalent SiMn9Ir3 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaIn2Ir by Materials Project

CaIrIn2 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Ca sites. In the first Ca site, Ca is bonded in a 1-coordinate geometry to three Ir and ten In atoms. There are a spread of Ca–Ir bond distances ranging from 2.98–3.18 Å. There are a spread of Ca–In bond distances ranging from 3.35–3.53 Å. In the second Ca site, Ca is bonded in a 2-coordinate geometry to three Ir and ten In atoms. There are a spread of Ca–Ir bond distances ranging from 3.07–3.25 Å. There are a spread of Ca–In bond distances ranging from 3.32–3.61 Å. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 9-coordinate geometry to three Ca and six In atoms. There are a spread of Ir–In bond distances ranging from 2.76–2.83 Å. In the second Ir site, Ir is bonded in a 9-coordinate geometry to three Ca and six In atoms. There are a spread of Ir–In bond distances ranging from 2.78–2.82 Å. There are two inequivalent In sites. In the first In site, In is bonded in a 12-coordinate geometry to five Ca, three Ir, and four In atoms. There are a spread of In–In bond distances ranging from 3.12–3.28 Å. In the second In site, In is bonded in a 12-coordinate geometry to five Ca, three Ir, and four In atoms. There are one shorter (3.19 Å) and two longer (3.23 Å) In–In bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba5AlIr2O11 by Materials Project

Ba5Ir2AlO11 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are five inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 11-coordinate geometry to eleven O2- atoms. There are a spread of Ba–O bond distances ranging from 2.74–3.06 Å. In the second Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.56–3.11 Å. In the third Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ba–O bond distances ranging from 2.61–3.17 Å. In the fourth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.80–3.13 Å. In the fifth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.72–2.93 Å. There are two inequivalent Ir+4.50+ sites. In the first Ir+4.50+ site, Ir+4.50+ is bonded to six O2- atoms to form face-sharing IrO6 octahedra. There are a spread of Ir–O bond distances ranging from 1.96–2.10 Å. In the second Ir+4.50+ site, Ir+4.50+ is bonded to six O2- atoms to form IrO6 octahedra that share corners with two equivalent AlO4 tetrahedra and a faceface with one IrO6 octahedra. There are a spread of Ir–O bond distances ranging from 1.96–2.08 Å. Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with two equivalent IrO6 octahedra. The corner-sharing octahedral tilt angles are 13°. There are a spread of Al–O bond distances ranging from 1.75–1.78 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded to four Ba2+ and two Ir+4.50+ atoms to form distorted OBa4Ir2 octahedra that share corners with two equivalent OBa4Ir2 octahedra, a cornercorner with one OBa4Ir square pyramid, and edges with two equivalent OBa4Ir2 octahedra. The corner-sharing octahedral tilt angles are 7°. In the second O2- site, O2- is bonded in a 2-coordinate geometry to four Ba2+, one Ir+4.50+, and one Al3+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to four Ba2+ and one Al3+ atom. In the fourth O2- site, O2- is bonded in a 6-coordinate geometry to four Ba2+ and two Ir+4.50+ atoms. In the fifth O2- site, O2- is bonded in a 5-coordinate geometry to four Ba2+ and one Al3+ atom. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to five Ba2+ and one Ir+4.50+ atom. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to four Ba2+ and one Ir+4.50+ atom. In the eighth O2- site, O2- is bonded to four Ba2+ and one Ir+4.50+ atom to form distorted OBa4Ir square pyramids that share a cornercorner with one OBa4Ir2 octahedra and corners with two equivalent OBa4Ir square pyramids. The corner-sharing octahedral tilt angles are 3°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba7(BIr)12 by Materials Project

Ba7(IrB)12 is alpha Pu-derived structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are two inequivalent Ba sites. In the first Ba site, Ba is bonded in a 3-coordinate geometry to one Ir and two equivalent B atoms. The Ba–Ir bond length is 3.14 Å. Both Ba–B bond lengths are 3.15 Å. In the second Ba site, Ba is bonded in a distorted cuboctahedral geometry to six equivalent Ir and six equivalent B atoms. All Ba–Ir bond lengths are 3.58 Å. All Ba–B bond lengths are 3.51 Å. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 4-coordinate geometry to four B atoms. There are two shorter (2.16 Å) and two longer (2.18 Å) Ir–B bond lengths. In the second Ir site, Ir is bonded in a 5-coordinate geometry to two Ba and four B atoms. There are two shorter (2.13 Å) and two longer (2.17 Å) Ir–B bond lengths. There are two inequivalent B sites. In the first B site, B is bonded in a 4-coordinate geometry to three Ba and four Ir atoms. In the second B site, B is bonded in a 5-coordinate geometry to four Ir and one B atom. The B–B bond length is 1.83 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeIr5 by Materials Project

CeIr5 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Ce is bonded in a distorted hexagonal planar geometry to eighteen Ir atoms. There are six shorter (3.06 Å) and twelve longer (3.43 Å) Ce–Ir bond lengths. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 12-coordinate geometry to three equivalent Ce and nine Ir atoms. There are six shorter (2.66 Å) and three longer (3.06 Å) Ir–Ir bond lengths. In the second Ir site, Ir is bonded to four equivalent Ce and eight Ir atoms to form a mixture of corner, edge, and face-sharing IrCe4Ir8 cuboctahedra. All Ir–Ir bond lengths are 2.65 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr5Ir3 by Materials Project

Zr5Ir3 crystallizes in the hexagonal P6_122 space group. The structure is three-dimensional. there are four inequivalent Zr sites. In the first Zr site, Zr is bonded in a 4-coordinate geometry to four Ir atoms. There are a spread of Zr–Ir bond distances ranging from 2.74–3.00 Å. In the second Zr site, Zr is bonded in a 6-coordinate geometry to six Ir atoms. There are a spread of Zr–Ir bond distances ranging from 2.80–2.99 Å. In the third Zr site, Zr is bonded in a 5-coordinate geometry to five Ir atoms. There are four shorter (2.77 Å) and one longer (2.93 Å) Zr–Ir bond lengths. In the fourth Zr site, Zr is bonded in a 6-coordinate geometry to six Ir atoms. There are a spread of Zr–Ir bond distances ranging from 2.73–2.99 Å. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 9-coordinate geometry to nine Zr atoms. In the second Ir site, Ir is bonded in a 8-coordinate geometry to eight Zr atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ThIr5 by Materials Project

ThIr5 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Th is bonded in a distorted hexagonal planar geometry to eighteen Ir atoms. There are six shorter (3.08 Å) and twelve longer (3.45 Å) Th–Ir bond lengths. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 12-coordinate geometry to three equivalent Th and nine Ir atoms. There are six shorter (2.67 Å) and three longer (3.08 Å) Ir–Ir bond lengths. In the second Ir site, Ir is bonded to four equivalent Th and eight Ir atoms to form a mixture of edge, corner, and face-sharing IrTh4Ir8 cuboctahedra. All Ir–Ir bond lengths are 2.67 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sn3Te3Ir2 by Materials Project

Ir2Sn3Te3 is Hausmannite-derived structured and crystallizes in the trigonal R-3 space group. The structure is three-dimensional. there are two inequivalent Ir sites. In the first Ir site, Ir is bonded to three Sn and three Te atoms to form IrSn3Te3 octahedra that share corners with six IrSn3Te3 octahedra and corners with six TeSn2Ir2 tetrahedra. The corner-sharing octahedra tilt angles range from 50–58°. There are two shorter (2.62 Å) and one longer (2.64 Å) Ir–Sn bond lengths. There are one shorter (2.68 Å) and two longer (2.70 Å) Ir–Te bond lengths. In the second Ir site, Ir is bonded to three equivalent Sn and three equivalent Te atoms to form IrSn3Te3 octahedra that share corners with six equivalent IrSn3Te3 octahedra and corners with six equivalent TeSn2Ir2 tetrahedra. The corner-sharing octahedra tilt angles range from 50–58°. All Ir–Sn bond lengths are 2.64 Å. All Ir–Te bond lengths are 2.68 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 4-coordinate geometry to two equivalent Ir and two equivalent Te atoms. There are one shorter (2.95 Å) and one longer (3.12 Å) Sn–Te bond lengths. In the second Sn site, Sn is bonded in a 4-coordinate geometry to two Ir and two equivalent Te atoms. There are one shorter (2.95 Å) and one longer (3.12 Å) Sn–Te bond lengths. There are two inequivalent Te sites. In the first Te site, Te is bonded to two equivalent Ir and two equivalent Sn atoms to form distorted TeSn2Ir2 tetrahedra that share corners with four IrSn3Te3 octahedra, corners with four TeSn2Ir2 tetrahedra, and an edgeedge with one TeSn2Ir2 tetrahedra. The corner-sharing octahedra tilt angles range from 70–74°. In the second Te site, Te is bonded to two Ir and two equivalent Sn atoms to form distorted TeSn2Ir2 tetrahedra that share corners with four equivalent IrSn3Te3 octahedra, corners with four TeSn2Ir2 tetrahedra, and an edgeedge with one TeSn2Ir2 tetrahedra. The corner-sharing octahedra tilt angles range from 69–74°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Gd2(Al3Ir)3 by Materials Project

Gd2(IrAl3)3 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Gd is bonded in a 11-coordinate geometry to six Ir and eleven Al atoms. There are a spread of Gd–Ir bond distances ranging from 3.43–3.48 Å. There are a spread of Gd–Al bond distances ranging from 3.05–3.18 Å. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 8-coordinate geometry to four equivalent Gd and eight Al atoms. There are a spread of Ir–Al bond distances ranging from 2.57–2.63 Å. In the second Ir site, Ir is bonded in a 8-coordinate geometry to four equivalent Gd and eight Al atoms. There are a spread of Ir–Al bond distances ranging from 2.57–2.63 Å. There are four inequivalent Al sites. In the first Al site, Al is bonded in a 3-coordinate geometry to three equivalent Gd and three Ir atoms. In the second Al site, Al is bonded in a 2-coordinate geometry to two equivalent Gd and two equivalent Ir atoms. In the third Al site, Al is bonded in a 3-coordinate geometry to two equivalent Gd and three Ir atoms. In the fourth Al site, Al is bonded in a 2-coordinate geometry to two equivalent Gd and two equivalent Ir atoms.

36 MATERIALS SCIENCE↗