Materials Data on Eu3Nb by Materials Project
Eu3Nb is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Eu sites. In the first Eu site, Eu is bonded in a 12-coordinate geometry to four equivalent Eu and four equivalent Nb atoms. All Eu–Eu bond lengths are 3.49 Å. All Eu–Nb bond lengths are 3.49 Å. In the second Eu site, Eu is bonded to eight equivalent Eu and four equivalent Nb atoms to form EuEu8Nb4 cuboctahedra that share corners with four equivalent EuEu8Nb4 cuboctahedra, corners with eight equivalent NbEu12 cuboctahedra, edges with eight equivalent EuEu8Nb4 cuboctahedra, faces with four equivalent EuEu8Nb4 cuboctahedra, and faces with six equivalent NbEu12 cuboctahedra. All Eu–Nb bond lengths are 3.72 Å. Nb is bonded to twelve Eu atoms to form NbEu12 cuboctahedra that share corners with four equivalent NbEu12 cuboctahedra, corners with eight equivalent EuEu8Nb4 cuboctahedra, edges with eight equivalent NbEu12 cuboctahedra, faces with four equivalent NbEu12 cuboctahedra, and faces with six equivalent EuEu8Nb4 cuboctahedra.