A⁵e Mossbauer study of a new series of rare-earth iron nitrides: R₂Fe₁₇N_{3- delta}

Abstract

57Fe MBssbauer spectra have been obtained at room temperature and at 15 K for RzFe17 and R ~F ~I ~N J -J (6 21 0.

Magnetic properties of Sm–Fe–B compounds

“…The average 57 Fe hyperfine field for YFe 6.97 B 0.03 with the rhombohedral Th 2 Zn 17 type structure is 168.4 kOe in our present study and that for Y 2 Fe 17 is 94 kOe [4] at room temperature. Hence, by substituting B for Fe, the average 57 Fe hyperfine field increases strongly.…”

A 57Fe Mössbauer study of nanostructured Sm2Fe17−xCoxC3

“…This value leads to a ratio (δ)/ (ln V), where V is the unit cell volume, of 2.25 mm/s, this value is larger than the value for R 2 Fe 17 N x (1.70 mm/s) [15].…”

Hyperfine interactions on iron in R2−xFe14+2xSi3 (R=Ce, Nd, Gd, Dy, Ho, Er, Lu, Y) compounds studied by Mössbauer spectroscopy

“…For the ideal structure (x = 0) within the space group P6 3 /mmc there are six inequivalent crystallographic positions accessible to the metal atoms: (2b), (2d), (4f), (6g), (12j) and (12k). Positions (2b) and (2d) are filled by the R atoms, while 3d atoms are distributed over remaining positions [2]. Somewhat similar situation is encountered for the R3m structure having the following metal-filled sub-lattices: (6c)-R, (6c), (9d), (18f) and (18h).…”

“…Intermetallic compounds R 2−x X 17 + 2x , where R stands for some rare earth or lighter actinide and X denotes some 3d transition metal crystallize in the R3m space group (rhombohedral) for X = Fe and lighter lantanides till Tb inclusive, and in the P6 3 /mmc space group (hexagonal) for heavier lantanides than Tb and the same 3d metal, i.e., for Fe [1,2]. For R = Y, Gd, Tb one can obtain compounds in both structures.…”

“…Somewhat similar situation is encountered for the R3m structure having the following metal-filled sub-lattices: (6c)-R, (6c), (9d), (18f) and (18h). Positions (6c)-R are filled again by the R atoms, while 3d atoms fill remaining sites [2]. Positions (4f) and (6c) form pairs called dumbbells.…”