Materials Data on La2Ir7 by Materials Project

Dataset · Thu Sep 03 04:00:00 EDT 2020

DOI:https://doi.org/10.17188/1759685· OSTI ID:1759685

La2Ir7 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are five inequivalent La sites. In the first La site, La is bonded in a 6-coordinate geometry to eighteen Ir atoms. There are a spread of La–Ir bond distances ranging from 3.14–3.55 Å. In the second La site, La is bonded in a 6-coordinate geometry to eighteen Ir atoms. There are a spread of La–Ir bond distances ranging from 3.14–3.55 Å. In the third La site, La is bonded in a 12-coordinate geometry to twelve Ir atoms. There are a spread of La–Ir bond distances ranging from 3.12–3.44 Å. In the fourth La site, La is bonded in a 6-coordinate geometry to eighteen Ir atoms. There are a spread of La–Ir bond distances ranging from 3.14–3.55 Å. In the fifth La site, La is bonded in a 6-coordinate geometry to eighteen Ir atoms. There are a spread of La–Ir bond distances ranging from 3.14–3.55 Å. There are eight inequivalent Ir sites. In the first Ir site, Ir is bonded to six equivalent La and six equivalent Ir atoms to form IrLa6Ir6 cuboctahedra that share corners with twelve equivalent IrLa5Ir7 cuboctahedra, edges with six equivalent IrLa6Ir6 cuboctahedra, and faces with eighteen equivalent IrLa5Ir7 cuboctahedra. All Ir–Ir bond lengths are 2.77 Å. In the second Ir site, Ir is bonded in a 12-coordinate geometry to three equivalent La and six Ir atoms. There are three shorter (2.63 Å) and three longer (2.69 Å) Ir–Ir bond lengths. In the third Ir site, Ir is bonded to four equivalent La and eight Ir atoms to form IrLa4Ir8 cuboctahedra that share corners with sixteen IrLa5Ir7 cuboctahedra, edges with ten IrLa5Ir7 cuboctahedra, and faces with ten IrLa4Ir8 cuboctahedra. There are a spread of Ir–Ir bond distances ranging from 2.67–2.71 Å. In the fourth Ir site, Ir is bonded in a 12-coordinate geometry to three equivalent La and six Ir atoms. There are three shorter (2.64 Å) and three longer (2.67 Å) Ir–Ir bond lengths. In the fifth Ir site, Ir is bonded to four equivalent La and eight Ir atoms to form IrLa4Ir8 cuboctahedra that share corners with sixteen IrLa5Ir7 cuboctahedra, edges with ten IrLa4Ir8 cuboctahedra, and faces with ten IrLa4Ir8 cuboctahedra. There are a spread of Ir–Ir bond distances ranging from 2.67–2.71 Å. In the sixth Ir site, Ir is bonded to four equivalent La and eight Ir atoms to form a mixture of edge, corner, and face-sharing IrLa4Ir8 cuboctahedra. All Ir–Ir bond lengths are 2.71 Å. In the seventh Ir site, Ir is bonded to five La and seven Ir atoms to form distorted IrLa5Ir7 cuboctahedra that share corners with seventeen IrLa6Ir6 cuboctahedra, edges with eight IrLa5Ir7 cuboctahedra, and faces with fourteen IrLa6Ir6 cuboctahedra. There are two shorter (2.69 Å) and two longer (2.74 Å) Ir–Ir bond lengths. In the eighth Ir site, Ir is bonded to four La and eight Ir atoms to form IrLa4Ir8 cuboctahedra that share corners with sixteen IrLa5Ir7 cuboctahedra, edges with ten IrLa4Ir8 cuboctahedra, and faces with ten IrLa4Ir8 cuboctahedra. There are two shorter (2.69 Å) and four longer (2.71 Å) Ir–Ir bond lengths.

• Research Organization: LBNL Materials Project; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• Contributing Organization: The Materials Project; MIT; UC Berkeley; Duke; U Louvain
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 1759685
• Report Number(s): mp-1190236
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Ir-La
La2Ir7
crystal structure