Materials Data on Eu2MnSi2O7 by Materials Project

Eu2MnSi2O7 crystallizes in the tetragonal P-42_1m space group. The structure is three-dimensional. Eu2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Eu–O bond distances ranging from 2.57–2.85 Å. Mn2+ is bonded to four equivalent O2- atoms to form MnO4 tetrahedra that share corners with four equivalent SiO4 tetrahedra. All Mn–O bond lengths are 2.05 Å. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one SiO4 tetrahedra and corners with two equivalent MnO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.62–1.68 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Eu2+ and two equivalent Si4+ atoms. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three equivalent Eu2+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Eu2+, one Mn2+, and one Si4+ atom.