Materials Data on Nd2NbGaO7 by Materials Project
Nd2NbGaO7 crystallizes in the orthorhombic Imma space group. The structure is three-dimensional. there are two inequivalent Nd3+ sites. In the first Nd3+ site, Nd3+ is bonded to eight O2- atoms to form distorted NdO8 hexagonal bipyramids that share edges with six NdO8 hexagonal bipyramids, edges with two equivalent GaO6 octahedra, and edges with four equivalent NbO6 octahedra. There are a spread of Nd–O bond distances ranging from 2.25–2.61 Å. In the second Nd3+ site, Nd3+ is bonded to eight O2- atoms to form distorted NdO8 hexagonal bipyramids that share edges with six NdO8 hexagonal bipyramids, edges with two equivalent NbO6 octahedra, and edges with four equivalent GaO6 octahedra. There are a spread of Nd–O bond distances ranging from 2.30–2.60 Å. Nb5+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with two equivalent NbO6 octahedra, corners with four equivalent GaO6 octahedra, and edges with six NdO8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 47°. There are four shorter (2.00 Å) and two longer (2.05 Å) Nb–O bond lengths. Ga3+ is bonded to six O2- atoms to form GaO6 octahedra that share corners with two equivalent GaO6 octahedra, corners with four equivalent NbO6 octahedra, and edges with six NdO8 hexagonal bipyramids. The corner-sharing octahedra tilt angles range from 47–49°. There are two shorter (2.02 Å) and four longer (2.06 Å) Ga–O bond lengths. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Nd3+ and two equivalent Nb5+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Nd3+ and two equivalent Ga3+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two Nd3+, one Nb5+, and one Ga3+ atom. In the fourth O2- site, O2- is bonded to four Nd3+ atoms to form corner-sharing ONd4 tetrahedra.