Rb3Tb is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a distorted body-centered cubic geometry to four equivalent Rb(2) and four equivalent Tb(1) atoms. In the second Rb site, Rb(2) is bonded in a body-centered cubic geometry to eight equivalent Rb(1) atoms. Tb(1) is bonded in a body-centered cubic geometry to eight equivalent Rb(1) atoms.
Rb3Tb is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a distorted body-centered cubic geometry to four equivalent Rb(2) and four equivalent Tb(1) atoms. All Rb(1)-Rb(2) bond lengths are 4.45 Å. All Rb(1)-Tb(1) bond lengths are 4.45 Å. In the second Rb site, Rb(2) is bonded in a body-centered cubic geometry to eight equivalent Rb(1) atoms. Tb(1) is bonded in a body-centered cubic geometry to eight equivalent Rb(1) atoms.