Materials Data on Eu2V2O5 by Materials Project
Eu2V2O5 crystallizes in the orthorhombic Ima2 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 2.44–2.96 Å. There are two inequivalent V3+ sites. In the first V3+ site, V3+ is bonded to six O2- atoms to form VO6 octahedra that share corners with four equivalent VO6 octahedra and corners with two equivalent VO4 tetrahedra. The corner-sharing octahedral tilt angles are 10°. There are four shorter (2.01 Å) and two longer (2.20 Å) V–O bond lengths. In the second V3+ site, V3+ is bonded to four O2- atoms to form VO4 tetrahedra that share corners with two equivalent VO6 octahedra and corners with two equivalent VO4 tetrahedra. The corner-sharing octahedral tilt angles are 35°. There are a spread of V–O bond distances ranging from 1.93–2.00 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to four equivalent Eu2+ and two equivalent V3+ atoms to form distorted OEu4V2 octahedra that share corners with two equivalent OEu4V2 octahedra, corners with four equivalent OEu2V2 tetrahedra, edges with two equivalent OEu4V2 octahedra, and faces with four equivalent OEu4V2 octahedra. The corner-sharing octahedral tilt angles are 2°. In the second O2- site, O2- is bonded in a 5-coordinate geometry to three equivalent Eu2+ and two V3+ atoms. In the third O2- site, O2- is bonded to two equivalent Eu2+ and two equivalent V3+ atoms to form distorted OEu2V2 tetrahedra that share corners with eight equivalent OEu4V2 octahedra and corners with two equivalent OEu2V2 tetrahedra. The corner-sharing octahedra tilt angles range from 22–79°.