Tc3Os is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Tc sites. In the first Tc site, Tc(1) is bonded to eight Tc(1,1) and four equivalent Os(1) atoms to form distorted TcTc8Os4 cuboctahedra that share corners with four equivalent Os(1)Tc12 cuboctahedra; corners with fourteen equivalent Tc(1)Tc8Os4 cuboctahedra; edges with six equivalent Os(1)Tc12 cuboctahedra; edges with twelve Tc(1,1)Tc8Os4 cuboctahedra; faces with four equivalent Os(1)Tc12 cuboctahedra; and faces with sixteen Tc(1,1)Tc8Os4 cuboctahedra. In the second Tc site, Tc(1) is bonded to eight equivalent Tc(1) and four equivalent Os(1) atoms to form distorted TcTc8Os4 cuboctahedra that share corners with four equivalent Os(1)Tc12 cuboctahedra; corners with fourteen Tc(1,1)Tc8Os4 cuboctahedra; edges with six equivalent Os(1)Tc12 cuboctahedra; edges with twelve equivalent Tc(1)Tc8Os4 cuboctahedra; faces with four equivalent Os(1)Tc12 cuboctahedra; and faces with sixteen Tc(1,1)Tc8Os4 cuboctahedra. Os(1) is bonded to twelve Tc(1,1) atoms to form OsTc12 cuboctahedra that share corners with six equivalent Os(1)Tc12 cuboctahedra; corners with twelve Tc(1,1)Tc8Os4 cuboctahedra; edges with eighteen Tc(1,1)Tc8Os4 cuboctahedra; faces with eight equivalent Os(1)Tc12 cuboctahedra; and faces with twelve Tc(1,1)Tc8Os4 cuboctahedra.
Tc3Os is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Tc sites. In the first Tc site, Tc(1) is bonded to eight Tc(1,1) and four equivalent Os(1) atoms to form distorted TcTc8Os4 cuboctahedra that share corners with four equivalent Os(1)Tc12 cuboctahedra; corners with fourteen equivalent Tc(1)Tc8Os4 cuboctahedra; edges with six equivalent Os(1)Tc12 cuboctahedra; edges with twelve Tc(1,1)Tc8Os4 cuboctahedra; faces with four equivalent Os(1)Tc12 cuboctahedra; and faces with sixteen Tc(1,1)Tc8Os4 cuboctahedra. There are a spread of Tc(1)-Tc(1,1) bond distances ranging from 2.69-2.76 Å. There are two shorter (2.70 Å) and two longer (2.74 Å) Tc(1)-Os(1) bond lengths. In the second Tc site, Tc(1) is bonded to eight equivalent Tc(1) and four equivalent Os(1) atoms to form distorted TcTc8Os4 cuboctahedra that share corners with four equivalent Os(1)Tc12 cuboctahedra; corners with fourteen Tc(1,1)Tc8Os4 cuboctahedra; edges with six equivalent Os(1)Tc12 cuboctahedra; edges with twelve equivalent Tc(1)Tc8Os4 cuboctahedra; faces with four equivalent Os(1)Tc12 cuboctahedra; and faces with sixteen Tc(1,1)Tc8Os4 cuboctahedra. There are two shorter (2.70 Å) and two longer (2.74 Å) Tc(1)-Os(1) bond lengths. Os(1) is bonded to twelve Tc(1,1) atoms to form OsTc12 cuboctahedra that share corners with six equivalent Os(1)Tc12 cuboctahedra; corners with twelve Tc(1,1)Tc8Os4 cuboctahedra; edges with eighteen Tc(1,1)Tc8Os4 cuboctahedra; faces with eight equivalent Os(1)Tc12 cuboctahedra; and faces with twelve Tc(1,1)Tc8Os4 cuboctahedra.