Materials Data on TaMnNbO6 by Materials Project
Mn(Nb0.5Ta0.5)2O6 crystallizes in the orthorhombic P2_12_12 space group. The structure is three-dimensional. Ta5+ is bonded to six O2- atoms to form distorted TaO6 octahedra that share corners with two equivalent TaO6 octahedra and corners with four MnO6 octahedra. The corner-sharing octahedra tilt angles range from 45–56°. There are a spread of Ta–O bond distances ranging from 1.84–2.31 Å. Nb5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Nb–O bond distances ranging from 1.83–2.37 Å. There are two inequivalent Mn2+ sites. In the first Mn2+ site, Mn2+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with four equivalent TaO6 octahedra and edges with two equivalent MnO6 octahedra. The corner-sharing octahedra tilt angles range from 45–55°. There are a spread of Mn–O bond distances ranging from 2.16–2.22 Å. In the second Mn2+ site, Mn2+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with four equivalent TaO6 octahedra and edges with two equivalent MnO6 octahedra. The corner-sharing octahedral tilt angles are 56°. There are a spread of Mn–O bond distances ranging from 2.18–2.24 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to one Ta5+, one Nb5+, and one Mn2+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Ta5+ and two equivalent Nb5+ atoms. In the third O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ta5+ and one Nb5+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to one Nb5+ and two Mn2+ atoms. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to one Ta5+ and two Mn2+ atoms. In the sixth O2- site, O2- is bonded in a trigonal planar geometry to one Ta5+, one Nb5+, and one Mn2+ atom.