Co、Mn对La(FeSi)_(13) B_x合金及其氢化物磁热性能的影响  

Effects of Co and Mn Addition on The Magnetocaloric Properties of La(FeSi)_(13)B_xAlloy and Its Hydride

作　　者：刘翠兰[1] 夏伟[1,2] 黄焦宏[1] 程娟[1] 张英德[1] 李兆杰[1] 

机构地区：[1]包头稀土研究院,内蒙古包头014030 [2]内蒙古师范大学内蒙古自治区功能材料物理与化学重点实验室,内蒙古呼和浩特010022

出　　处：《稀土》2015年第6期80-83,共4页Chinese Rare Earths

基　　金：国家自然科学基金项目(51261001);国际合作项目(2011DFA53230)

摘　　要：在La(FeSi)_(13)基合金中加入少量间隙原子B后,分别以Co、Mn原子替代Fe原子,熔炼得到的合金样品再吸氢,利用X射线衍射物相分析(XRD)和振动样品磁强计(VSM)测量合金吸氢前后的相结构和磁性能。研究表明,用Co替代Fe原子后,La(FeSi)_(13)B_(0.2)合金的居里温度Tc提高,用Mn替代Fe原子后,La(FeSi)_(13)B_(0.1)合金的居里温度Tc会降低.两种替代都会使La(FeSi)_(13)B_x合金的等温磁熵变降低,但相对于金属Gd来说,其等温磁熵变还保持在一个相对较大的值。吸氢后添加Co和Mn的两种合金的居里温度Tc分别大幅度提升到378 K和279 K,而其等温磁熵变相对于吸氢前略微降低,分别降低为7.9 J/(kg·K)和6.9J/(kg·K)。The La（FeSi） J3 based alloys doped by B with Co and Mn partially substituted for Fe were studied. The alloys were hydrogenised for increasing their Curie temperatures Tc. The microstructures and magnetic properties of the alloy were ex- amined by XRD and VSM, The Tc of the La（FeSi） 13B0.2 alloy was increased by Fe partial substituted with Co while the in- verse trend was obtained by Fe partially substituted by Mn. Neither the Co nor the Mn elements substitution can increase the maximum magnetic entropy change. However, the relative large maximum magnetic entropy changes corresponding to Gd can also be achieved by the two methods. The Tc of the alloys can be greatly increased to room temperature of 279K and high tem- perature of 378K, while the maximum magnetic entropy changes can be slightly decreased to 6.9 and 7.9 J/kg. K for LaFe11.39 Mno. 3s Sil. 26 Bo. 1 Hy and LaFell＇ 5 Coo. 4 Sil. l Bo. 2 Hx alloys by hydrogenization, respectively.

关 键 词：La(FeSi)_(13)合金 居里温度 等温磁熵变 吸氢 

分 类 号：TG132.27[一般工业技术—材料科学与工程] TM271[金属学及工艺—合金]