“…Intermetallic alloys between rare-earth ͑R͒ and 3d-transition ͑T͒ elements with a magnetic compensation temperature, such as R 6 Fe 23 , are important for high-density magneto-optical recording, for hydrogen storage, 1 and for basic studies. 2 All R 6 Fe 23 compounds crystallize in the cubic ͑Fm3m͒ Th 6 Mn 23 structure, R being located in site ͑24e͒ and Fe occupying the four distinct positions ͑4b, 24d, 32f 1 , and 32f 2 ͒.…”