Materials Data on PrNb4O12 by Materials Project
PrNb4O12 crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. Pr4+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Pr–O bond distances ranging from 2.51–2.84 Å. Nb5+ is bonded to six O2- atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedra tilt angles range from 6–28°. There are a spread of Nb–O bond distances ranging from 1.94–2.09 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted T-shaped geometry to one Pr4+ and two equivalent Nb5+ atoms. In the second O2- site, O2- is bonded in a linear geometry to two equivalent Nb5+ atoms. In the third O2- site, O2- is bonded in a linear geometry to one Pr4+ and two equivalent Nb5+ atoms. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to one Pr4+ and two equivalent Nb5+ atoms. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to one Pr4+ and two equivalent Nb5+ atoms.