Materials Data on Pr2Fe17C3 by Materials Project
Pr2Fe17C3 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Pr is bonded in a distorted trigonal planar geometry to four Fe and three equivalent C atoms. There are one shorter (3.13 Å) and three longer (3.38 Å) Pr–Fe bond lengths. All Pr–C bond lengths are 2.54 Å. There are four inequivalent Fe sites. In the first Fe site, Fe is bonded to two equivalent Pr and ten Fe atoms to form distorted FePr2Fe10 cuboctahedra that share corners with four equivalent FePr2Fe10 cuboctahedra, corners with two equivalent CPr2Fe4 octahedra, faces with four equivalent FePr2Fe10 cuboctahedra, and faces with four equivalent CPr2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. There are a spread of Fe–Fe bond distances ranging from 2.46–2.69 Å. In the second Fe site, Fe is bonded in a single-bond geometry to four Fe and one C atom. Both Fe–Fe bond lengths are 2.76 Å. The Fe–C bond length is 1.90 Å. In the third Fe site, Fe is bonded in a single-bond geometry to three Fe and one C atom. The Fe–Fe bond length is 2.67 Å. The Fe–C bond length is 1.91 Å. In the fourth Fe site, Fe is bonded in a 2-coordinate geometry to one Pr and thirteen Fe atoms. The Fe–Fe bond length is 2.36 Å. C is bonded to two equivalent Pr and four Fe atoms to form CPr2Fe4 octahedra that share corners with two equivalent FePr2Fe10 cuboctahedra, corners with four equivalent CPr2Fe4 octahedra, and faces with four equivalent FePr2Fe10 cuboctahedra. The corner-sharing octahedral tilt angles are 60°.