Materials Data on Eu(MgGa)2 by Materials Project

Abstract

Eu(MgGa)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Mg is bonded to four equivalent Ga atoms to form MgGa4 tetrahedra that share corners with eight equivalent EuGa8 hexagonal bipyramids, corners with four equivalent MgGa4 tetrahedra, edges with four equivalent EuGa8 hexagonal bipyramids, and edges with four equivalent MgGa4 tetrahedra. All Mg–Ga bond lengths are 2.81 Å. Eu is bonded to eight equivalent Ga atoms to form distorted EuGa8 hexagonal bipyramids that share corners with sixteen equivalent MgGa4 tetrahedra, edges with four equivalent EuGa8 hexagonal bipyramids, edges with eight equivalent MgGa4 tetrahedra, and faces with four equivalent EuGa8 hexagonal bipyramids. All Eu–Ga bond lengths are 3.42 Å. Ga is bonded in a 9-coordinate geometry to four equivalent Mg, four equivalent Eu, and one Ga atom. The Ga–Ga bond length is 2.50 Å.