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All sourcesNASA NTRSDOE OSTI
DOE OSTI2019

Materials Data on Eu2Ge3Au by Materials Project

Eu2AuGe3 is hexagonal omega structure-derived structured and crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Eu is bonded to three equivalent Au and nine Ge atoms to form a mixture of face and edge-sharing EuGe9Au3 cuboctahedra. All Eu–Au bond lengths are 3.32 Å. There are three shorter (3.32 Å) and six longer (3.37 Å) Eu–Ge bond lengths. Au is bonded in a 3-coordinate geometry to six equivalent Eu and three equivalent Ge atoms. All Au–Ge bond lengths are 2.53 Å. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to six equivalent Eu and three equivalent Ge atoms. All Ge–Ge bond lengths are 2.53 Å. In the second Ge site, Ge is bonded in a distorted trigonal planar geometry to six equivalent Eu and three equivalent Au atoms. In the third Ge site, Ge is bonded in a 9-coordinate geometry to six equivalent Eu and three equivalent Ge atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu2Ge3Au by Materials Project

Eu2AuGe3 crystallizes in the orthorhombic Fmmm space group. The structure is three-dimensional. there are two inequivalent Eu sites. In the first Eu site, Eu is bonded to two equivalent Au and ten Ge atoms to form a mixture of edge and face-sharing EuGe10Au2 cuboctahedra. Both Eu–Au bond lengths are 3.38 Å. There are a spread of Eu–Ge bond distances ranging from 3.31–3.38 Å. In the second Eu site, Eu is bonded to four equivalent Au and eight Ge atoms to form a mixture of edge and face-sharing EuGe8Au4 cuboctahedra. All Eu–Au bond lengths are 3.35 Å. All Eu–Ge bond lengths are 3.36 Å. Au is bonded in a distorted trigonal planar geometry to six Eu and three Ge atoms. All Au–Ge bond lengths are 2.54 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a distorted single-bond geometry to six Eu, one Au, and two equivalent Ge atoms. Both Ge–Ge bond lengths are 2.50 Å. In the second Ge site, Ge is bonded in a distorted single-bond geometry to six Eu, one Au, and two Ge atoms. The Ge–Ge bond length is 2.49 Å.

36 MATERIALS SCIENCE↗