Materials Data on Cr7C3 by Materials Project
Cr7C3 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are five inequivalent Cr sites. In the first Cr site, Cr is bonded in a 3-coordinate geometry to three C atoms. There are a spread of Cr–C bond distances ranging from 2.01–2.04 Å. In the second Cr site, Cr is bonded in a distorted bent 150 degrees geometry to two C atoms. Both Cr–C bond lengths are 2.07 Å. In the third Cr site, Cr is bonded in a distorted trigonal planar geometry to three C atoms. There are one shorter (1.99 Å) and two longer (2.02 Å) Cr–C bond lengths. In the fourth Cr site, Cr is bonded in a distorted L-shaped geometry to two equivalent C atoms. Both Cr–C bond lengths are 2.07 Å. In the fifth Cr site, Cr is bonded in a 3-coordinate geometry to three C atoms. There are one shorter (1.99 Å) and two longer (2.04 Å) Cr–C bond lengths. There are two inequivalent C sites. In the first C site, C is bonded in a 6-coordinate geometry to six Cr atoms. In the second C site, C is bonded in a 6-coordinate geometry to six Cr atoms.