Materials Data on Mg2TaNiO6 by Materials Project
Mg2TaNiO6 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. there are two inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded in a 6-coordinate geometry to eight O2- atoms. There are a spread of Mg–O bond distances ranging from 2.07–2.73 Å. In the second Mg2+ site, Mg2+ is bonded in a 4-coordinate geometry to eight O2- atoms. There are a spread of Mg–O bond distances ranging from 2.06–2.68 Å. Ta5+ is bonded to six O2- atoms to form TaO6 octahedra that share corners with two equivalent TaO6 octahedra and corners with four equivalent NiO6 octahedra. The corner-sharing octahedra tilt angles range from 40–43°. There are a spread of Ta–O bond distances ranging from 1.96–2.02 Å. Ni3+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with two equivalent NiO6 octahedra and corners with four equivalent TaO6 octahedra. The corner-sharing octahedra tilt angles range from 40–45°. There are a spread of Ni–O bond distances ranging from 1.93–2.07 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to three Mg2+, one Ta5+, and one Ni3+ atom. In the second O2- site, O2- is bonded in a 5-coordinate geometry to three Mg2+, one Ta5+, and one Ni3+ atom. In the third O2- site, O2- is bonded to two Mg2+ and two equivalent Ta5+ atoms to form distorted corner-sharing OMg2Ta2 trigonal pyramids. In the fourth O2- site, O2- is bonded to two Mg2+ and two equivalent Ni3+ atoms to form distorted corner-sharing OMg2Ni2 trigonal pyramids.