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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Eu(CoSi)2 by Materials Project

EuCo2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Eu3+ is bonded in a body-centered cubic geometry to eight equivalent Si4- atoms. All Eu–Si bond lengths are 3.10 Å. Co+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of corner and edge-sharing CoSi4 tetrahedra. All Co–Si bond lengths are 2.30 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Eu3+, four equivalent Co+2.50+, and one Si4- atom. The Si–Si bond length is 2.66 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on EuCo9Si2 by Materials Project

EuCo9Si2 crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Eu is bonded in a 8-coordinate geometry to eighteen Co atoms. There are a spread of Eu–Co bond distances ranging from 3.05–3.16 Å. There are two inequivalent Co sites. In the first Co site, Co is bonded in a 6-coordinate geometry to two equivalent Eu, eight equivalent Co, and four equivalent Si atoms. All Co–Co bond lengths are 2.63 Å. All Co–Si bond lengths are 2.56 Å. In the second Co site, Co is bonded to two equivalent Eu, eight Co, and two equivalent Si atoms to form a mixture of distorted face, edge, and corner-sharing CoEu2Co8Si2 cuboctahedra. There are a spread of Co–Co bond distances ranging from 2.42–2.64 Å. There are one shorter (2.37 Å) and one longer (2.38 Å) Co–Si bond lengths. Si is bonded in a 10-coordinate geometry to ten Co atoms.

36 MATERIALS SCIENCE↗