Cost effective modification of SmCo5-type alloys

Abstract

In the present work we present a preliminary experimental and ab-initio study of a series of compounds with nominal composition Sm1-xMMxCo5-y-zFeyNiz ( x = 0 – 0.7; y = 0.5 – 1.5; z = 0.5 – 1). Compounds with MM content up to 50% were successfully synthesized in CaCu5-type structure, retaining uniaxial magnetocrystalline anisotropy. Magnetization values are within the 85 to 50 Am2/kg range, with Ni content playing a significant role in stabilization of the structure at the cost of magnetization weakening. Theoretical calculations predict higher magnetization values, especially in the case of SmCo2.5Fe1.5Ni compound with a value close to that of SmCo5.

Towards Production of Cost-Effective Modification of SmCo5-Type Alloys Suitable for Permanent Magnets

“…According to the predictions of ab initio simulations [80], the SmCo 2.5 Fe 1.5 Ni composition presents a large mass magnetization, not much smaller than the value of the mother SmCo 5 compound. By simultaneously substituting Co with Fe and Ni, a favorable interplay between stability and magnetization could be tuned, benefiting from the additional advantage of the reduction of Co content.…”

“…Despite the confidence in the manufacturing of SmCoNiFe 3 , the experimental synthesis of this compound has not yet been reported. An approach toward this synthase was attempted by Gavrikov et al and G. Sempros et al [79,80]. Based on calculations, ribbons with nominal composition Sm(Co 1−x−y Fe x Ni y ) 5 (x = 0.15, 0.3, 0.45; y = 0.05, 0.1, 0.15) were prepared [81].…”

“…Lately, a recent series of theoretical as well as experimental studies developed the possibility of simultaneously introducing metallic Ce-La at a Ce:La ratio of 3:1 into the SmCo 5 system and reducing the Co content [80,[86][87][88]. The theoretical framework of the compounds and the relevant ab initio parameters were intensively investigated.…”