Materials Data on Eu3Mg by Materials Project

Abstract

MgEu3 crystallizes in the orthorhombic Pmm2 space group. The structure is three-dimensional. Mg is bonded in a distorted q6 geometry to ten Eu atoms. There are a spread of Mg–Eu bond distances ranging from 3.67–3.77 Å. There are three inequivalent Eu sites. In the first Eu site, Eu is bonded to two equivalent Mg and ten Eu atoms to form a mixture of corner, edge, and face-sharing EuEu10Mg2 cuboctahedra. There are a spread of Eu–Eu bond distances ranging from 3.62–3.97 Å. In the second Eu site, Eu is bonded to four equivalent Mg and eight Eu atoms to form a mixture of distorted corner, edge, and face-sharing EuEu8Mg4 cuboctahedra. There are two shorter (3.81 Å) and two longer (3.97 Å) Eu–Eu bond lengths. In the third Eu site, Eu is bonded to four equivalent Mg and eight Eu atoms to form distorted EuEu8Mg4 cuboctahedra that share corners with ten equivalent EuEu8Mg4 cuboctahedra, edges with fourteen EuEu10Mg2 cuboctahedra, and faces with sixteen EuEu10Mg2 cuboctahedra. Both Eu–Eu bond lengths are 3.97 Å.