Eu3Ta is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a distorted body-centered cubic geometry to four equivalent Eu(2) and four equivalent Ta(1) atoms. In the second Eu site, Eu(2) is bonded in a 14-coordinate geometry to eight equivalent Eu(1) and six equivalent Ta(1) atoms. Ta(1) is bonded in a distorted body-centered cubic geometry to six equivalent Eu(2) and eight equivalent Eu(1) atoms.
Eu3Ta is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a distorted body-centered cubic geometry to four equivalent Eu(2) and four equivalent Ta(1) atoms. All Eu(1)-Eu(2) bond lengths are 3.51 Å. All Eu(1)-Ta(1) bond lengths are 3.51 Å. In the second Eu site, Eu(2) is bonded in a 14-coordinate geometry to eight equivalent Eu(1) and six equivalent Ta(1) atoms. All Eu(2)-Ta(1) bond lengths are 4.05 Å. Ta(1) is bonded in a distorted body-centered cubic geometry to six equivalent Eu(2) and eight equivalent Eu(1) atoms.