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All sourcesNASA NTRSDOE OSTI
NASA NTRS1992

Experimental determination of the solubility of iridium in silicate melts: Preliminary results

Little is known of the geochemical behavior of iridium. Normally this element is taken to be chalcophile and/or siderophile so that during planetary differentiation processes, e.g., core formation, iridium is extracted from silicate phases into metallic phases. Experimental determination of the metal/silicate partition coefficient of iridium is difficult simply because it is so large. Also there are no data on the solubility behavior of iridium in silicate melts. With information on the solubility of iridium in silicate melts it is possible, in combination with experimental data for Fe-Ir alloys, to calculate the partition coefficient between a metallic phase and a silicate melt.

Borisov, Alexander↗
DOE OSTI2020

Materials Data on FeIr3 by Materials Project

FeIr3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Fe is bonded to twelve equivalent Ir atoms to form FeIr12 cuboctahedra that share corners with twelve equivalent FeIr12 cuboctahedra, edges with twenty-four equivalent IrFe4Ir8 cuboctahedra, faces with six equivalent FeIr12 cuboctahedra, and faces with twelve equivalent IrFe4Ir8 cuboctahedra. All Fe–Ir bond lengths are 2.68 Å. Ir is bonded to four equivalent Fe and eight equivalent Ir atoms to form IrFe4Ir8 cuboctahedra that share corners with twelve equivalent IrFe4Ir8 cuboctahedra, edges with eight equivalent FeIr12 cuboctahedra, edges with sixteen equivalent IrFe4Ir8 cuboctahedra, faces with four equivalent FeIr12 cuboctahedra, and faces with fourteen equivalent IrFe4Ir8 cuboctahedra. All Ir–Ir bond lengths are 2.68 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on FeIr3 by Materials Project

FeIr3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Fe is bonded to twelve Ir atoms to form FeIr12 cuboctahedra that share corners with four equivalent FeIr12 cuboctahedra, corners with eight equivalent IrFe4Ir8 cuboctahedra, edges with eight equivalent FeIr12 cuboctahedra, edges with sixteen equivalent IrFe4Ir8 cuboctahedra, faces with four equivalent FeIr12 cuboctahedra, and faces with fourteen IrFe4Ir8 cuboctahedra. All Fe–Ir bond lengths are 2.69 Å. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded to four equivalent Fe and eight Ir atoms to form IrFe4Ir8 cuboctahedra that share corners with twelve equivalent IrFe4Ir8 cuboctahedra, edges with eight equivalent FeIr12 cuboctahedra, edges with sixteen IrFe4Ir8 cuboctahedra, faces with four equivalent FeIr12 cuboctahedra, and faces with fourteen IrFe4Ir8 cuboctahedra. All Ir–Ir bond lengths are 2.69 Å. In the second Ir site, Ir is bonded to four equivalent Fe and eight equivalent Ir atoms to form IrFe4Ir8 cuboctahedra that share corners with four equivalent IrFe4Ir8 cuboctahedra, corners with eight equivalent FeIr12 cuboctahedra, edges with twenty-four IrFe4Ir8 cuboctahedra, faces with six equivalent FeIr12 cuboctahedra, and faces with twelve IrFe4Ir8 cuboctahedra.

36 MATERIALS SCIENCE↗