X-ray and neutron determination of a so-called Th2Ni17-type structure in the lutetium-iron system

On the crystal structures of the R2Co17 intermetallic compounds

“…However, the ordering proces, for R2Co17 of the Th2Nilv-type structure depends critically on the element R. The degree of order increases from Y through Dy, Ce, Ho to Er where it is practically 100 %. Our X-ray results for R2Co~7 (Th~Ni~7-type) are therefore in direct contradiction to those reported by Givord, Lemaire & Moreau (1972) and , according to whom 'ThzNi]7 is an ideal structure and does not exist at all'. Our investigations show that this structure does exist, at least for ErzCol~ (Table 4).…”

Magnetization measurements on RE2Fe17 single crystals

“…From these measurements a value of 2.11/xB/Fe at 4.2 K has been obtained for the magnetic moment of the iron atoms. This value is slightly higher than the one determined by other authors [2,6] but such a difference can be attributed to slight differences of stoichiometry in the samples [7,8].…”

Local atomic order in the vicinity of Cu2 dumbbells in TbCu7-type YCu6.576 studied by Bragg and total scattering techniques

“…[6] that the substitution, if fully disordered (case ii), results in the structure type TbCu 7 (P6/mmm; a 0 ¼ a, c 0 ¼ c [7]) where s can vary between 0 and 1/3 (see Results and discussion). A partially disordered Th 2 Ni 17 structure (case iii) gives the structure type LuFe 9.5 (P6 3 /mmc; a 0 ¼ O3a, c 0 ¼ 2c) [8]). Partially disordered Th 2 Zn 17 structure yields the structure type PrFe 7 (R-3m, a 0 ¼ O3a, c 0 ¼ 3c [9]).…”