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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 MnCu3 by Materials Project

Cu3Mn is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Mn is bonded to twelve equivalent Cu atoms to form MnCu12 cuboctahedra that share corners with six equivalent MnCu12 cuboctahedra, corners with twelve equivalent CuMn4Cu8 cuboctahedra, edges with eighteen equivalent CuMn4Cu8 cuboctahedra, faces with eight equivalent MnCu12 cuboctahedra, and faces with twelve equivalent CuMn4Cu8 cuboctahedra. All Mn–Cu bond lengths are 2.60 Å. Cu is bonded to four equivalent Mn and eight equivalent Cu atoms to form CuMn4Cu8 cuboctahedra that share corners with four equivalent MnCu12 cuboctahedra, corners with fourteen equivalent CuMn4Cu8 cuboctahedra, edges with six equivalent MnCu12 cuboctahedra, edges with twelve equivalent CuMn4Cu8 cuboctahedra, faces with four equivalent MnCu12 cuboctahedra, and faces with sixteen equivalent CuMn4Cu8 cuboctahedra. There are six shorter (2.59 Å) and two longer (2.61 Å) Cu–Cu bond lengths.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Mn4Cu by Materials Project

CuMn4 is alpha La-derived structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are five inequivalent Mn sites. In the first Mn site, Mn is bonded to nine Mn and three equivalent Cu atoms to form MnMn9Cu3 cuboctahedra that share corners with twelve MnMn9Cu3 cuboctahedra, edges with six equivalent CuMn6Cu6 cuboctahedra, edges with eighteen MnMn9Cu3 cuboctahedra, faces with six equivalent CuMn6Cu6 cuboctahedra, and faces with twelve MnMn9Cu3 cuboctahedra. There are three shorter (2.40 Å) and six longer (2.49 Å) Mn–Mn bond lengths. All Mn–Cu bond lengths are 2.62 Å. In the second Mn site, Mn is bonded to twelve Mn atoms to form MnMn12 cuboctahedra that share corners with three equivalent CuMn6Cu6 cuboctahedra, corners with nine MnMn9Cu3 cuboctahedra, edges with three equivalent CuMn6Cu6 cuboctahedra, edges with twenty-one MnMn9Cu3 cuboctahedra, and faces with eighteen MnMn9Cu3 cuboctahedra. There are six shorter (2.49 Å) and three longer (2.57 Å) Mn–Mn bond lengths. In the third Mn site, Mn is bonded to twelve Mn atoms to form MnMn12 cuboctahedra that share corners with three equivalent CuMn6Cu6 cuboctahedra, corners with nine MnMn9Cu3 cuboctahedra, edges with three equivalent CuMn6Cu6 cuboctahedra, edges with twenty-one MnMn9Cu3 cuboctahedra, and faces with eighteen MnMn9Cu3 cuboctahedra. There are three shorter (2.40 Å) and six longer (2.49 Å) Mn–Mn bond lengths. In the fourth Mn site, Mn is bonded to twelve Mn atoms to form MnMn12 cuboctahedra that share corners with three equivalent CuMn6Cu6 cuboctahedra, corners with nine MnMn9Cu3 cuboctahedra, edges with three equivalent CuMn6Cu6 cuboctahedra, edges with twenty-one MnMn9Cu3 cuboctahedra, and faces with eighteen MnMn9Cu3 cuboctahedra. There are a spread of Mn–Mn bond distances ranging from 2.40–2.57 Å. In the fifth Mn site, Mn is bonded to twelve Mn atoms to form MnMn12 cuboctahedra that share corners with three equivalent CuMn6Cu6 cuboctahedra, corners with nine MnMn9Cu3 cuboctahedra, edges with three equivalent CuMn6Cu6 cuboctahedra, edges with twenty-one MnMn9Cu3 cuboctahedra, and faces with eighteen MnMn9Cu3 cuboctahedra. There are a spread of Mn–Mn bond distances ranging from 2.40–2.57 Å. Cu is bonded to six equivalent Mn and six equivalent Cu atoms to form CuMn6Cu6 cuboctahedra that share corners with six MnMn12 cuboctahedra, corners with six equivalent CuMn6Cu6 cuboctahedra, edges with six equivalent CuMn6Cu6 cuboctahedra, edges with eighteen MnMn9Cu3 cuboctahedra, faces with six equivalent CuMn6Cu6 cuboctahedra, and faces with twelve equivalent MnMn9Cu3 cuboctahedra. All Cu–Cu bond lengths are 2.49 Å.

36 MATERIALS SCIENCE↗