Materials Data on UCrB4 by Materials Project
UCrB4 crystallizes in the orthorhombic Pbam space group. The structure is three-dimensional. U3+ is bonded in a 2-coordinate geometry to fourteen B+1.50- atoms. There are a spread of U–B bond distances ranging from 2.60–2.72 Å. Cr3+ is bonded in a 10-coordinate geometry to ten B+1.50- atoms. There are a spread of Cr–B bond distances ranging from 2.26–2.32 Å. There are four inequivalent B+1.50- sites. In the first B+1.50- site, B+1.50- is bonded in a 9-coordinate geometry to four equivalent U3+, two equivalent Cr3+, and three B+1.50- atoms. There are a spread of B–B bond distances ranging from 1.77–1.82 Å. In the second B+1.50- site, B+1.50- is bonded in a 9-coordinate geometry to four equivalent U3+, two equivalent Cr3+, and three B+1.50- atoms. There is one shorter (1.72 Å) and one longer (1.75 Å) B–B bond length. In the third B+1.50- site, B+1.50- is bonded in a 9-coordinate geometry to two equivalent U3+, four equivalent Cr3+, and three B+1.50- atoms. There is one shorter (1.70 Å) and one longer (1.73 Å) B–B bond length. In the fourth B+1.50- site, B+1.50- is bonded in a 9-coordinate geometry to four equivalent U3+, two equivalent Cr3+, and three B+1.50- atoms.