Cu添加对La_(0.7)Ce_(0.3)Fe_(11.54-x)Cu_(x)Mn_(0.16)Si_(1.3)合金及其氢化物磁性能的影响  

Influence of Cu on the Magnetic Properties of La_(0.7)Ce_(0.3)Fe_(11.54-x)Cu_(x)Mn_(0.16)Si_(1.3) Alloy and Its Hydride

作　　者：程娟[1] 郭亚茹 李兆杰[1] 高磊 王鹏宇 刘翠兰[1] Cheng Juan;Guo Yaru;Li Zhaojie;Gao Lei;Wang Pengyu;Liu Cuilan(State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou Research Institute of Rare Earth,Baotou 014030,China)

机构地区：[1]包头稀土研究院白云鄂博稀土资源研究与综合利用国家重点实验室,内蒙古包头014030

出　　处：《稀有金属材料与工程》2023年第10期3680-3684,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(52066001);内蒙古自治区自然科学基金(2021MS05016);中央引导地方科技发展资金项目(2022ZY0014);北方稀土项目(BFXT-2021-D-0013)。

摘　　要：La(Fe,Si)_(13)系合金是具有一级相变大磁热效应的磁制冷合金,被认为是极具应用前景的磁热效应材料之一。采用高频感应悬浮炉制备了不同Cu元素含量的La_(0.7)Ce_(0.3)Fe_(11.54-x)Cu_(x)Mn_(0.16)Si_(1.3)(x=0,0.05,0.1,0.15)合金。并利用粉末X射线衍射仪、扫描电镜(SEM)对合金的相组成、微观组织结构进行了研究,采用多功能振动样品磁强计VersaLab对合金的磁性能进行了分析。结果表明,添加Cu元素后,合金的居里温度提高,氢化后居里温度提高至室温,但随Cu含量升高,居里温度反而偏低。随着Cu元素含量提高磁热性能下降,但La_(0.7)Ce_(0.3)Fe_(11.44)Cu_(0.1)Mn_(0.16)Si_(1.3)H_(1.68)合金的最大等温磁熵变仍高达8.5 J/(kg·K)(0~2 T),相对制冷能力RCP提高(118 J/kg,x=0.1),磁滞明显降低。La(Fe,Si)_(13) alloys possessed first order magnetic transition show large magnetocaloric effect,and is considered as a promising magnetocaloric effect material.La_(0.7)Ce_(0.3)Fe_(11.54-x)Cu_(x)Mn_(0.16)Si_(1.3)(x=0,0.05,0.1,0.15)alloys with different contents of Cu were prepared by high frequence induction melting furnace.With the aid of powder XRD and scanning electron microscope(SEM),the phase composition and microstructure were investigated.The magnetic properties were measured by using the magnetometer VersaLab.The results show that Curie temperature increases after partial Cu substitution for Fe,Curie temperatures of the doped alloys after hydrogenation are around room temperature,however shows the decrease when the Cu content increases.Although the magnetocaloric effects decrease with the increase in Cu content,the max magnetic entropy change of La_(0.7)Ce_(0.3)Fe_(11.44)Cu_(0.1)Mn_(0.16)Si_(1.3)H_(1.68) alloy is still as high as 8.5 J/(kg·K)(0-2 T),the relative cooling property(RCP)improves(118 J/kg,x=0.1)and the hysteresis decreases evidently.

关 键 词：磁热效应 磁制冷 相对制冷能力 磁滞 

分 类 号：TB64[一般工业技术—制冷工程]