Materials Data on Ho2MnNiO6 by Materials Project
Ho2NiMnO6 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Ho3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ho–O bond distances ranging from 2.24–2.74 Å. Mn2+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with six equivalent NiO6 octahedra. The corner-sharing octahedra tilt angles range from 34–37°. There is four shorter (1.94 Å) and two longer (1.96 Å) Mn–O bond length. Ni4+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with six equivalent MnO6 octahedra. The corner-sharing octahedra tilt angles range from 34–37°. There are two shorter (2.06 Å) and four longer (2.08 Å) Ni–O bond lengths. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Ho3+, one Mn2+, and one Ni4+ atom to form distorted corner-sharing OHo2MnNi trigonal pyramids. In the second O2- site, O2- is bonded in a 5-coordinate geometry to three equivalent Ho3+, one Mn2+, and one Ni4+ atom. In the third O2- site, O2- is bonded in a 5-coordinate geometry to three equivalent Ho3+, one Mn2+, and one Ni4+ atom.