Tc7B3 crystallizes in the hexagonal P6_3mc space group. There are three inequivalent Tc sites. In the first Tc site, Tc(1) is bonded in a distorted L-shaped geometry to two equivalent B(1) atoms. In the second Tc site, Tc(3) is bonded in a 3-coordinate geometry to three equivalent B(1) atoms. In the third Tc site, Tc(2) is bonded in a 3-coordinate geometry to three equivalent B(1) atoms. B(1) is bonded in a 6-coordinate geometry to one Tc(3), two equivalent Tc(1), and three equivalent Tc(2) atoms.
Tc7B3 crystallizes in the hexagonal P6_3mc space group. There are three inequivalent Tc sites. In the first Tc site, Tc(1) is bonded in a distorted L-shaped geometry to two equivalent B(1) atoms. Both Tc(1)-B(1) bond lengths are 2.23 Å. In the second Tc site, Tc(3) is bonded in a 3-coordinate geometry to three equivalent B(1) atoms. All Tc(3)-B(1) bond lengths are 2.20 Å. In the third Tc site, Tc(2) is bonded in a 3-coordinate geometry to three equivalent B(1) atoms. There is one shorter (2.18 Å) and two longer (2.19 Å) Tc(2)-B(1) bond lengths. B(1) is bonded in a 6-coordinate geometry to one Tc(3), two equivalent Tc(1), and three equivalent Tc(2) atoms.