Materials Data on La2Ni2O5 by Materials Project

Abstract

La2Ni2O5 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. La3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of La–O bond distances ranging from 2.39–2.72 Å. There are two inequivalent Ni2+ sites. In the first Ni2+ site, Ni2+ is bonded in a square co-planar geometry to four O2- atoms. There is two shorter (1.89 Å) and two longer (1.90 Å) Ni–O bond length. In the second Ni2+ site, Ni2+ is bonded to six O2- atoms to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles are 29°. There are a spread of Ni–O bond distances ranging from 1.95–2.19 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent La3+ and two equivalent Ni2+ atoms to form distorted corner-sharing OLa2Ni2 tetrahedra. In the second O2- site, O2- is bonded in a 5-coordinate geometry to three equivalent La3+ and two Ni2+ atoms. In the third O2- site, O2- is bonded in a 5-coordinate geometry to three equivalent La3+ and two Ni2+ atoms.