Tc4Si crystallizes in the orthorhombic Fmmm space group. There are two inequivalent Tc sites. In the first Tc site, Tc(1) is bonded in a 8-coordinate geometry to two equivalent Tc(2), four equivalent Tc(1), and two equivalent Si(1) atoms. In the second Tc site, Tc(2) is bonded in a 8-coordinate geometry to two equivalent Tc(1) and six equivalent Tc(2) atoms. Si(1) is bonded in a distorted body-centered cubic geometry to four equivalent Tc(1) and four equivalent Si(1) atoms.
Tc4Si crystallizes in the orthorhombic Fmmm space group. There are two inequivalent Tc sites. In the first Tc site, Tc(1) is bonded in a 8-coordinate geometry to two equivalent Tc(2), four equivalent Tc(1), and two equivalent Si(1) atoms. Both Tc(1)-Tc(2) bond lengths are 2.66 Å. All Tc(1)-Tc(1) bond lengths are 2.73 Å. Both Tc(1)-Si(1) bond lengths are 2.46 Å. In the second Tc site, Tc(2) is bonded in a 8-coordinate geometry to two equivalent Tc(1) and six equivalent Tc(2) atoms. There are two shorter (2.68 Å) and four longer (2.73 Å) Tc(2)-Tc(2) bond lengths. Si(1) is bonded in a distorted body-centered cubic geometry to four equivalent Tc(1) and four equivalent Si(1) atoms. All Si(1)-Si(1) bond lengths are 2.73 Å.