Materials Data on Eu2BaCoO5 by Materials Project
BaEu2CoO5 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. Ba2+ is bonded in a distorted q6 geometry to ten O2- atoms. There are eight shorter (2.95 Å) and two longer (2.99 Å) Ba–O bond lengths. Eu3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Eu–O bond distances ranging from 2.38–2.49 Å. Co2+ is bonded to six O2- atoms to form corner-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are two shorter (1.89 Å) and four longer (2.19 Å) Co–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Ba2+, three equivalent Eu3+, and one Co2+ atom to form a mixture of distorted edge, face, and corner-sharing OBa2Eu3Co octahedra. The corner-sharing octahedra tilt angles range from 0–68°. In the second O2- site, O2- is bonded in a 6-coordinate geometry to two equivalent Ba2+, two equivalent Eu3+, and two equivalent Co2+ atoms.