摘要
采用高频悬浮熔炼炉制备了La0.75Ce0.25Fe11.51Mn0.24Si1.25Al0.3和La0.75Ce0.25Fe11.51Mn0.24Si1.25合金样品。样品在0.05 MPa压力、598 K氢气中吸氢至饱和。经X射线衍射及SEM分析La0.75Ce0.25Fe11.51Mn0.24Si1.25Al0.3Hy样品为NaZn13型结构。研究结果表明,在1.5 T磁场下,La0.75Ce0.25Fe11.51Mn0.24Si1.25Al0.3Hy合金样品的等温磁熵变ΔSM为9.06 J/(kg·K),直接测量的样品绝热温变为2.53 K,均比不含Al元素的La0.75Ce0.25Fe11.51Mn0.24Si1.3Hy略低;但磁熵变ΔSM和绝热温变ΔTad的半峰宽δT均大幅提高;同时,合金制冷能力提高。
High frequency levitation melting furnace was used to prepare La0.75Ce0.25Fe11.51Mn0.24Si1.25Al0.3 and La0.75Ce0.25Fe11.51Mn0.24Si1.25 alloy samples.The samples absorbed hydrogen to saturation under 0.05 MPa pressure and 598 K.X-ray diffraction and SEM analysis show that the sample La0.75 Ce0.25 Fe11.51 Mn0.24 Si1.25 Al0.3 Hy is NaZn13 structure.Under 1.5 T,isothermal magnetic entropy change(ΔSM)of La0.75Ce0.25Fe11.51Mn0.24Si1.25Al0.3Hy alloy is 9.06 J/(kg·K),and adiabatic temperature changes(ΔTad)is 2.53 K.These data just below that of La0.75Ce0.25Fe11.51Mn0.24Si1.3Hy.But the half-peak breadth of isothermal magnetic entropy change(ΔSM)and adiabatic temperature changes(ΔTad)both substantially increased.At the same time,refrigeration capacity increased.
作者
黄立婷
戴默涵
张英德
程娟
金培育
刘翠兰
麻永林
HUANG Li-ting;DAI Mo-han;ZHANG Ying-de;CHENG Juan;JIN Pei-yu;LIU Cui-lan;MA Yong-lin(School of Materials and Metallurgy,Inner Mongolia University of Science Technology,Baotou 014010,China;State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou Research Institute of Rare Earths,Baotou 014030,China)
出处
《稀土》
EI
CAS
CSCD
北大核心
2020年第4期67-72,共6页
Chinese Rare Earths
基金
国家重点研发项目(SQ2017YFGX090026)
广东省重大基础研究项目(2018B030308006)。
关键词
磁热效应
绝热温变
磁熵变
半峰宽
制冷能力
magnetocloric effects
adiabatic temperature changes
magnetic entropy change
half peak width
refrigeration capacity
