Tm_2.22Co₆Sn₂₀ and TmLi₂Co₆Sn₂₀ stannides as disordered derivatives of the Cr₂₃C₆ structure type

The new ternary Tm_2.22Co₆Sn₂₀ [a = 13.5365 (7) Å] and quaternary TmLi₂Co₆Sn₂₀ [a = 13.5371 (16) Å] phases crystallize in the same cubic crystal system in the space group Fm3m and are disordered variants of the binary Cr₂₃C₆ structure type (cF116).