Crystal structure of RE12Fe2+xPb3−x (RE = Tm, Lu) compounds

The crystal structures of Tm12Fe2.55Pb2.45 and Lu12Fe2.55Pb2.45 compounds were refined from X-ray powder diffraction data. The investigated compounds crystallize in the Er12Fe2In3 structure type (space group I4/mmm, Pearson code tI34) with the lattice parameters a = 9.6387(5), c = 9.3286(5) Å for Tm12Fe2.55Pb2.45 and a = 9.5860(7), c = 9.2428(7) Å for Lu12Fe2.55Pb2.45.