Eu3Tc 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 to four equivalent Eu(2) and four equivalent Tc(1) atoms to form a mixture of distorted edge, face, and corner-sharing EuEu4Tc4 tetrahedra. In the second Eu site, Eu(2) is bonded in a 14-coordinate geometry to eight equivalent Eu(1) and six equivalent Tc(1) atoms. Tc(1) is bonded in a distorted body-centered cubic geometry to six equivalent Eu(2) and eight equivalent Eu(1) atoms.
Eu3Tc 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 to four equivalent Eu(2) and four equivalent Tc(1) atoms to form a mixture of distorted edge, face, and corner-sharing EuEu4Tc4 tetrahedra. All Eu(1)-Eu(2) bond lengths are 3.33 Å. All Eu(1)-Tc(1) bond lengths are 3.33 Å. In the second Eu site, Eu(2) is bonded in a 14-coordinate geometry to eight equivalent Eu(1) and six equivalent Tc(1) atoms. All Eu(2)-Tc(1) bond lengths are 3.85 Å. Tc(1) is bonded in a distorted body-centered cubic geometry to six equivalent Eu(2) and eight equivalent Eu(1) atoms.