Rb3Si is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to four equivalent Rb(2) and four equivalent Si(1) atoms to form a mixture of distorted edge, corner, and face-sharing RbRb4Si4 tetrahedra. In the second Rb site, Rb(2) is bonded in a body-centered cubic geometry to eight equivalent Rb(1) atoms. Si(1) is bonded in a body-centered cubic geometry to eight equivalent Rb(1) atoms.
Rb3Si is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to four equivalent Rb(2) and four equivalent Si(1) atoms to form a mixture of distorted edge, corner, and face-sharing RbRb4Si4 tetrahedra. All Rb(1)-Rb(2) bond lengths are 3.89 Å. All Rb(1)-Si(1) bond lengths are 3.89 Å. In the second Rb site, Rb(2) is bonded in a body-centered cubic geometry to eight equivalent Rb(1) atoms. Si(1) is bonded in a body-centered cubic geometry to eight equivalent Rb(1) atoms.