K3Tc is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 4-coordinate geometry to four equivalent K(2) and four equivalent Tc(1) atoms. In the second K site, K(2) is bonded to eight equivalent K(1) and four equivalent Tc(1) atoms to form distorted KK8Tc4 cuboctahedra that share corners with four equivalent K(2)K8Tc4 cuboctahedra, corners with eight equivalent Tc(1)K12 cuboctahedra, edges with eight equivalent K(2)K8Tc4 cuboctahedra, faces with four equivalent K(2)K8Tc4 cuboctahedra, and faces with six equivalent Tc(1)K12 cuboctahedra. Tc(1) is bonded to four equivalent K(2) and eight equivalent K(1) atoms to form TcK12 cuboctahedra that share corners with four equivalent Tc(1)K12 cuboctahedra, corners with eight equivalent K(2)K8Tc4 cuboctahedra, edges with eight equivalent Tc(1)K12 cuboctahedra, faces with four equivalent Tc(1)K12 cuboctahedra, and faces with six equivalent K(2)K8Tc4 cuboctahedra.
K3Tc is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 4-coordinate geometry to four equivalent K(2) and four equivalent Tc(1) atoms. All K(1)-K(2) bond lengths are 3.96 Å. All K(1)-Tc(1) bond lengths are 3.96 Å. In the second K site, K(2) is bonded to eight equivalent K(1) and four equivalent Tc(1) atoms to form distorted KK8Tc4 cuboctahedra that share corners with four equivalent K(2)K8Tc4 cuboctahedra, corners with eight equivalent Tc(1)K12 cuboctahedra, edges with eight equivalent K(2)K8Tc4 cuboctahedra, faces with four equivalent K(2)K8Tc4 cuboctahedra, and faces with six equivalent Tc(1)K12 cuboctahedra. All K(2)-Tc(1) bond lengths are 4.07 Å. Tc(1) is bonded to four equivalent K(2) and eight equivalent K(1) atoms to form TcK12 cuboctahedra that share corners with four equivalent Tc(1)K12 cuboctahedra, corners with eight equivalent K(2)K8Tc4 cuboctahedra, edges with eight equivalent Tc(1)K12 cuboctahedra, faces with four equivalent Tc(1)K12 cuboctahedra, and faces with six equivalent K(2)K8Tc4 cuboctahedra.