Influence of gadolinium and dysprosium substitution on magnetic properties and magnetocaloric effect of Fe78-xRExSi4Nb5B12Cu1 amorphous alloys

作者：Lizhong Zhao,Huacun Tian,Xichun Zhong,Zhongwu Liu,Jean-Marc Greneche,R.V.Ramanujan

摘要：Amorphous Fe78-xRExSi4 Nb5 B12Cu1(RE=Gd,Dy) ribbons with different RE contents were prepared by melt spinning to investigate the effect of heavy rare earth(Gd,Dy) substitution on the hyperfine structure,magnetic properties and magnetocaloric effect.The Curie temperature of RE substituted alloys,hyperfine field and magnetic moments of Fe atoms initially increase up to 1 at% RE content and then decrease monotonously for increasing RE content up to 10 at%.The dependence of magnetic entropy change(-△SM) and refrigeration capacity(RC) of the alloys on RE contents displays the same tendency.The RCAREA values of the alloys substituted with 1 at% Gd and Dy are similar to those of recently reported Fe-based metallic glasses with enhanced RC values compared with those of Gd5 Ge1.9Si2 Fe0.1.Enhanced-△SM and RC values,negligible coercive force and hysteresis commonly make these Fe78-xREx-Si4 Nb5 B12Cu1 amorphous alloys as low-cost candidates for high-temperature magnetic refrigeration.

发文机构：Institute of Advanced Magnetic Materials School of Materials Science and Engineering Guangdong Institute of Special Equipment Inspection and Research Institut des Molecules et Materiaux du Mans UMR CNRS 6283 School of Materials Science and Engineering Singapore-HUJ Alliance for Research and Enterprise（SHARE）

关键词：MagneticpropertiesMagnetocaloriceffectRefrigerationcapacityRareearths

分类号： TG1[金属学及工艺—金属学]