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All sourcesNASA NTRSDOE OSTI
NASA NTRS1974

Elemental abundances in meteoritic and terrestrial matter

Major and trace element analyses of over 180 individual chondrules from 12 carbonaceous chondrites are reported, including individual analyses of 60 chondrules from Pueblito de Allende. Siderophile elements in most chondrules are depleted, compared to the whole chondrite. Correlations of Al-Ir and Ir-Sc among chondrules high in Ca and Al were observed. A Cu-Mn correlation was also found for chondrules from some meteorites. No correlation was observed between Au and other siderophile elements (Fe, Ni, Co and Ir). It is suggested that these elemental associations were present in the material from which the chondrules formed. Compositionally, chondrules appear to be a multicomponent mixture of remelted dust. One component displaying an Al-Ir correlation is identified as Allende-type white aggregates. The other components are a material chemically similar to the present matrix and sulfides-plus-metal material. Abundances of the REE (rare earth elements) were measured in ordinary Allende chondrules and were 50% higher than REE abundances in Mokoia chondrules; REE abundances in Ca-Al rich chondrules were similar to REE abundances in Ca-rich white aggregates.

Schmitt, R. A.↗
DOE OSTI2020

Materials Data on ScIr by Materials Project

IrSc is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Sc is bonded in a body-centered cubic geometry to eight equivalent Ir atoms. All Sc–Ir bond lengths are 2.80 Å. Ir is bonded in a body-centered cubic geometry to eight equivalent Sc atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sc11Ir4 by Materials Project

Sc11Ir4 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional and consists of four Sc6Ir clusters and one Sc16Ir7 framework. In each Sc6Ir cluster, Sc is bonded in a single-bond geometry to one Ir atom. The Sc–Ir bond length is 2.66 Å. Ir is bonded in an octahedral geometry to six equivalent Sc atoms. In the Sc16Ir7 framework, there are two inequivalent Sc sites. In the first Sc site, Sc is bonded to four Ir atoms to form a mixture of distorted corner and edge-sharing ScIr4 tetrahedra. There are one shorter (2.72 Å) and three longer (2.96 Å) Sc–Ir bond lengths. In the second Sc site, Sc is bonded in a trigonal planar geometry to three equivalent Ir atoms. All Sc–Ir bond lengths are 2.74 Å. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a body-centered cubic geometry to eight equivalent Sc atoms. In the second Ir site, Ir is bonded in a 12-coordinate geometry to eight Sc atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ScIr3 by Materials Project

ScIr3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Sc is bonded to twelve equivalent Ir atoms to form a mixture of face and corner-sharing ScIr12 cuboctahedra. All Sc–Ir bond lengths are 2.79 Å. Ir is bonded in a distorted square co-planar geometry to four equivalent Sc atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ScIr2 by Materials Project

ScIr2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Sc is bonded in a 12-coordinate geometry to twelve equivalent Ir atoms. All Sc–Ir bond lengths are 3.07 Å. Ir is bonded to six equivalent Sc and six equivalent Ir atoms to form a mixture of edge, corner, and face-sharing IrSc6Ir6 cuboctahedra. All Ir–Ir bond lengths are 2.62 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sc2Ir by Materials Project

Sc2Ir crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. there are two inequivalent Sc sites. In the first Sc site, Sc is bonded in a 6-coordinate geometry to six equivalent Ir atoms. All Sc–Ir bond lengths are 2.73 Å. In the second Sc site, Sc is bonded in a 2-coordinate geometry to four equivalent Ir atoms. There are two shorter (2.80 Å) and two longer (3.15 Å) Sc–Ir bond lengths. Ir is bonded in a 9-coordinate geometry to nine Sc atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sc4Ir by Materials Project

Sc4Ir is Iron carbide-like structured and crystallizes in the cubic Fd-3m space group. The structure is zero-dimensional and consists of eight Sc4Ir clusters. Sc is bonded in a single-bond geometry to one Ir atom. The Sc–Ir bond length is 2.46 Å. Ir is bonded in a tetrahedral geometry to four equivalent Sc atoms.

36 MATERIALS SCIENCE↗