TcPt3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Tc(1) is bonded to four equivalent Pt(2) and eight equivalent Pt(1) atoms to form TcPt12 cuboctahedra that share corners with four equivalent Tc(1)Pt12 cuboctahedra, corners with eight equivalent Pt(2)Tc4Pt8 cuboctahedra, edges with eight equivalent Tc(1)Pt12 cuboctahedra, edges with sixteen equivalent Pt(1)Tc4Pt8 cuboctahedra, faces with four equivalent Tc(1)Pt12 cuboctahedra, faces with six equivalent Pt(2)Tc4Pt8 cuboctahedra, and faces with eight equivalent Pt(1)Tc4Pt8 cuboctahedra. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to four equivalent Tc(1), four equivalent Pt(1), and four equivalent Pt(2) atoms to form PtTc4Pt8 cuboctahedra that share corners with twelve equivalent Pt(1)Tc4Pt8 cuboctahedra, edges with eight equivalent Tc(1)Pt12 cuboctahedra, edges with eight equivalent Pt(1)Tc4Pt8 cuboctahedra, edges with eight equivalent Pt(2)Tc4Pt8 cuboctahedra, faces with four equivalent Tc(1)Pt12 cuboctahedra, faces with four equivalent Pt(2)Tc4Pt8 cuboctahedra, and faces with ten equivalent Pt(1)Tc4Pt8 cuboctahedra. In the second Pt site, Pt(2) is bonded to four equivalent Tc(1) and eight equivalent Pt(1) atoms to form distorted PtTc4Pt8 cuboctahedra that share corners with four equivalent Pt(2)Tc4Pt8 cuboctahedra, corners with eight equivalent Tc(1)Pt12 cuboctahedra, edges with eight equivalent Pt(2)Tc4Pt8 cuboctahedra, edges with sixteen equivalent Pt(1)Tc4Pt8 cuboctahedra, faces with four equivalent Pt(2)Tc4Pt8 cuboctahedra, faces with six equivalent Tc(1)Pt12 cuboctahedra, and faces with eight equivalent Pt(1)Tc4Pt8 cuboctahedra.
TcPt3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Tc(1) is bonded to four equivalent Pt(2) and eight equivalent Pt(1) atoms to form TcPt12 cuboctahedra that share corners with four equivalent Tc(1)Pt12 cuboctahedra, corners with eight equivalent Pt(2)Tc4Pt8 cuboctahedra, edges with eight equivalent Tc(1)Pt12 cuboctahedra, edges with sixteen equivalent Pt(1)Tc4Pt8 cuboctahedra, faces with four equivalent Tc(1)Pt12 cuboctahedra, faces with six equivalent Pt(2)Tc4Pt8 cuboctahedra, and faces with eight equivalent Pt(1)Tc4Pt8 cuboctahedra. All Tc(1)-Pt(2) bond lengths are 2.74 Å. All Tc(1)-Pt(1) bond lengths are 2.77 Å. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to four equivalent Tc(1), four equivalent Pt(1), and four equivalent Pt(2) atoms to form PtTc4Pt8 cuboctahedra that share corners with twelve equivalent Pt(1)Tc4Pt8 cuboctahedra, edges with eight equivalent Tc(1)Pt12 cuboctahedra, edges with eight equivalent Pt(1)Tc4Pt8 cuboctahedra, edges with eight equivalent Pt(2)Tc4Pt8 cuboctahedra, faces with four equivalent Tc(1)Pt12 cuboctahedra, faces with four equivalent Pt(2)Tc4Pt8 cuboctahedra, and faces with ten equivalent Pt(1)Tc4Pt8 cuboctahedra. All Pt(1)-Pt(1) bond lengths are 2.74 Å. All Pt(1)-Pt(2) bond lengths are 2.77 Å. In the second Pt site, Pt(2) is bonded to four equivalent Tc(1) and eight equivalent Pt(1) atoms to form distorted PtTc4Pt8 cuboctahedra that share corners with four equivalent Pt(2)Tc4Pt8 cuboctahedra, corners with eight equivalent Tc(1)Pt12 cuboctahedra, edges with eight equivalent Pt(2)Tc4Pt8 cuboctahedra, edges with sixteen equivalent Pt(1)Tc4Pt8 cuboctahedra, faces with four equivalent Pt(2)Tc4Pt8 cuboctahedra, faces with six equivalent Tc(1)Pt12 cuboctahedra, and faces with eight equivalent Pt(1)Tc4Pt8 cuboctahedra.