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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on EuAl3Cu2 by Materials Project

EuCu2Al3 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Eu is bonded in a 6-coordinate geometry to six equivalent Cu and twelve equivalent Al atoms. All Eu–Cu bond lengths are 3.13 Å. All Eu–Al bond lengths are 3.41 Å. Cu is bonded in a 9-coordinate geometry to three equivalent Eu and six equivalent Al atoms. All Cu–Al bond lengths are 2.59 Å. Al is bonded to four equivalent Eu and four equivalent Cu atoms to form a mixture of distorted edge, corner, and face-sharing AlEu4Cu4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(Al2Cu)4 by Materials Project

Eu(CuAl2)4 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Eu is bonded in a 12-coordinate geometry to eight equivalent Cu and twelve Al atoms. All Eu–Cu bond lengths are 3.39 Å. There are four shorter (3.08 Å) and eight longer (3.22 Å) Eu–Al bond lengths. Cu is bonded in a 12-coordinate geometry to two equivalent Eu, two equivalent Cu, and eight Al atoms. Both Cu–Cu bond lengths are 2.57 Å. There are four shorter (2.57 Å) and four longer (2.70 Å) Cu–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to one Eu, four equivalent Cu, and five Al atoms. There are a spread of Al–Al bond distances ranging from 2.70–2.83 Å. In the second Al site, Al is bonded in a 12-coordinate geometry to two equivalent Eu, four equivalent Cu, and six Al atoms. Both Al–Al bond lengths are 2.76 Å.

36 MATERIALS SCIENCE↗