Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “Ir-Mg-Si”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

4 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on MgSi7Ir3 by Materials Project

MgIr3Si7 crystallizes in the trigonal R-3c space group. The structure is three-dimensional. Mg2+ is bonded to twelve equivalent Si+1.71- atoms to form edge-sharing MgSi12 cuboctahedra. There are six shorter (3.13 Å) and six longer (3.17 Å) Mg–Si bond lengths. Ir+3.33+ is bonded in a 7-coordinate geometry to seven Si+1.71- atoms. There are a spread of Ir–Si bond distances ranging from 2.44–2.52 Å. There are two inequivalent Si+1.71- sites. In the first Si+1.71- site, Si+1.71- is bonded in a distorted trigonal planar geometry to three equivalent Ir+3.33+ atoms. In the second Si+1.71- site, Si+1.71- is bonded in a 3-coordinate geometry to two equivalent Mg2+ and three equivalent Ir+3.33+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg15Si2Ir5 by Materials Project

Mg15Ir5Si2 crystallizes in the tetragonal P4_2/n space group. The structure is three-dimensional. there are eight inequivalent Mg sites. In the first Mg site, Mg is bonded in a 2-coordinate geometry to three Ir and one Si atom. There are a spread of Mg–Ir bond distances ranging from 2.71–3.01 Å. The Mg–Si bond length is 2.78 Å. In the second Mg site, Mg is bonded in a distorted bent 150 degrees geometry to two Ir atoms. There are one shorter (2.63 Å) and one longer (2.66 Å) Mg–Ir bond lengths. In the third Mg site, Mg is bonded in a 2-coordinate geometry to two equivalent Ir atoms. There are one shorter (2.82 Å) and one longer (3.00 Å) Mg–Ir bond lengths. In the fourth Mg site, Mg is bonded in a 1-coordinate geometry to three Ir and one Si atom. There are a spread of Mg–Ir bond distances ranging from 2.71–2.83 Å. The Mg–Si bond length is 2.79 Å. In the fifth Mg site, Mg is bonded in a 3-coordinate geometry to three Ir atoms. There are a spread of Mg–Ir bond distances ranging from 2.69–2.89 Å. In the sixth Mg site, Mg is bonded in a 6-coordinate geometry to four Ir and two equivalent Si atoms. There are a spread of Mg–Ir bond distances ranging from 2.80–3.04 Å. There are one shorter (2.79 Å) and one longer (2.80 Å) Mg–Si bond lengths. In the seventh Mg site, Mg is bonded in a 6-coordinate geometry to four Ir and two equivalent Si atoms. There are a spread of Mg–Ir bond distances ranging from 2.77–3.03 Å. There are one shorter (2.77 Å) and one longer (2.82 Å) Mg–Si bond lengths. In the eighth Mg site, Mg is bonded in a linear geometry to two equivalent Ir atoms. Both Mg–Ir bond lengths are 2.70 Å. There are three inequivalent Ir sites. In the first Ir site, Ir is bonded in a 9-coordinate geometry to eight Mg and one Si atom. The Ir–Si bond length is 2.36 Å. In the second Ir site, Ir is bonded in a 10-coordinate geometry to nine Mg and one Si atom. The Ir–Si bond length is 2.36 Å. In the third Ir site, Ir is bonded to ten Mg and two equivalent Si atoms to form distorted face-sharing IrMg10Si2 cuboctahedra. Both Ir–Si bond lengths are 2.38 Å. Si is bonded in a 9-coordinate geometry to six Mg and three Ir atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg3Si8Ir3 by Materials Project

Mg3Ir3Si8 crystallizes in the cubic F-43m space group. The structure is three-dimensional. there are three inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded in a 9-coordinate geometry to nine Si2- atoms. There are three shorter (3.04 Å) and six longer (3.06 Å) Mg–Si bond lengths. In the second Mg2+ site, Mg2+ is bonded in a distorted cuboctahedral geometry to twelve equivalent Si2- atoms. All Mg–Si bond lengths are 3.15 Å. In the third Mg2+ site, Mg2+ is bonded in a 12-coordinate geometry to twelve equivalent Si2- atoms. All Mg–Si bond lengths are 2.97 Å. Ir+3.33+ is bonded in a 6-coordinate geometry to six Si2- atoms. There are four shorter (2.42 Å) and two longer (2.46 Å) Ir–Si bond lengths. There are two inequivalent Si2- sites. In the first Si2- site, Si2- is bonded in a 9-coordinate geometry to four Mg2+, two equivalent Ir+3.33+, and three equivalent Si2- atoms. There are one shorter (2.42 Å) and two longer (2.62 Å) Si–Si bond lengths. In the second Si2- site, Si2- is bonded in a distorted trigonal planar geometry to three equivalent Mg2+ and three equivalent Ir+3.33+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgSiIr2 by Materials Project

MgIr2Si is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Mg is bonded in a body-centered cubic geometry to eight equivalent Ir atoms. All Mg–Ir bond lengths are 2.61 Å. Ir is bonded in a body-centered cubic geometry to four equivalent Mg and four equivalent Si atoms. All Ir–Si bond lengths are 2.61 Å. Si is bonded in a distorted body-centered cubic geometry to eight equivalent Ir atoms.

36 MATERIALS SCIENCE↗