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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ce(NiAs)2 by Materials Project

CeNi2As2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ce3+ is bonded in a distorted body-centered cubic geometry to eight equivalent As3- atoms. All Ce–As bond lengths are 3.19 Å. Ni+1.50+ is bonded to four equivalent As3- atoms to form a mixture of corner and edge-sharing NiAs4 tetrahedra. All Ni–As bond lengths are 2.37 Å. As3- is bonded in a 9-coordinate geometry to four equivalent Ce3+, four equivalent Ni+1.50+, and one As3- atom. The As–As bond length is 2.64 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ce(NiAs)2 by Materials Project

CeNi2As2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Ce3+ is bonded in a 8-coordinate geometry to eight As3- atoms. There are four shorter (3.10 Å) and four longer (3.12 Å) Ce–As bond lengths. There are two inequivalent Ni+1.50+ sites. In the first Ni+1.50+ site, Ni+1.50+ is bonded in a 5-coordinate geometry to five As3- atoms. There are one shorter (2.31 Å) and four longer (2.33 Å) Ni–As bond lengths. In the second Ni+1.50+ site, Ni+1.50+ is bonded to four equivalent As3- atoms to form a mixture of edge and corner-sharing NiAs4 tetrahedra. All Ni–As bond lengths are 2.39 Å. There are two inequivalent As3- sites. In the first As3- site, As3- is bonded in a 9-coordinate geometry to four equivalent Ce3+ and five Ni+1.50+ atoms. In the second As3- site, As3- is bonded in a 4-coordinate geometry to four equivalent Ce3+ and four equivalent Ni+1.50+ atoms.

36 MATERIALS SCIENCE↗