Crystal structure and magnetic properties of Y6 (Fe1−x Alx)23 compounds

Abstract

Crystal structures are studied in a series of alloys in the Y6Fe(1−x Alx)23 system. The binary phase Y6Fe23 (of Th6Mn23 structure) is confirmed. The phase boundary by Al substitution is located at 20 at% Al. The magnetic properties are studied by means of magnetization measurements in fields up to 60 kOe for 0 ≦ x ≦ 0.20. The Curie temperatures and the mean magnetic moments decrease with increasing × values; this decrease is qualitatively discussed in a localized model.

New Thermodynamic Assessment of the Fe-Y System

“…First magnetic studies were carried out by Kirchmayr, [40] Kirchmayr and Steiner [41] and Besnus et al [42] As it was mentioned above, alloys in the Fe-Y system are of interest as potential permanent magnetic materials. Therefore, many investigations of magnetic properties of intermetallic compounds of the Fe-Y system were subsequently performed.…”

Influence of aluminum substitution on the magnetic couplings in R-T alloys Ho6Fe23−xAlx

“…3͒. 10 However, in Ho 6 Fe 23−x Al x this condition appears too severe: the calculations show that one Fe atom contributes to the ferrimagnetism when it has only n 0 = 5 nearest Fe neighbors ͑in-set of Fig. 2͒.…”

“…3͒ than in our compounds. According to Besnus et al 10 one Fe ion will contribute to the magnetization of its own sublattice only if the number of Fe nearest neighbors is larger than a minimum n 0 value among the N possible. The mean Fe moment is then given by M Fe ͑x͒ = M Fe ͑x =0͚͒ n 0 N P͑x , n , N͒, where ͚ n 0 N P͑x , n , N͒ is the usual probability function.…”

Magnetic properties of aluminum-substituted R–T deuterides Ho6(Fe,Al)23Dz

“…11 According to Besnus et al 11 one Fe ion will contribute to the magnetization of its own sublattice only if the number of Fe nearest neighbors is larger than a minimum n 0 value among the N possible. The mean Fe moment is then given by Fe ͑x͒ = Fe ͑x =0͚͒ n0 N P͑x , n , N͒, where P͑x , n , N͒ = ͓N!/n!͑N − n͒!͔͑1−x͒ n x N−n is the usual probability function ͑N = 9 for R 6 Fe 23 D z compounds͒.…”