Materials Data on U2CoSi3 by Materials Project
U2CoSi3 crystallizes in the orthorhombic Pmm2 space group. The structure is three-dimensional. there are two inequivalent U5+ sites. In the first U5+ site, U5+ is bonded in a 10-coordinate geometry to ten Si4- atoms. There are a spread of U–Si bond distances ranging from 2.96–3.04 Å. In the second U5+ site, U5+ is bonded to eight Si4- atoms to form a mixture of distorted corner, edge, and face-sharing USi8 hexagonal bipyramids. There are a spread of U–Si bond distances ranging from 2.89–3.00 Å. Co2+ is bonded in a trigonal planar geometry to three Si4- atoms. All Co–Si bond lengths are 2.29 Å. There are three inequivalent Si4- sites. In the first Si4- site, Si4- is bonded in a 9-coordinate geometry to six U5+ and three Si4- atoms. There are one shorter (2.33 Å) and two longer (2.34 Å) Si–Si bond lengths. In the second Si4- site, Si4- is bonded in a 9-coordinate geometry to six U5+, two equivalent Co2+, and one Si4- atom. In the third Si4- site, Si4- is bonded in a 9-coordinate geometry to six U5+, one Co2+, and two equivalent Si4- atoms.