Mn_(1.35)Fe_(0.65)P_(0.45)Si_(0.55)B_x合金的磁热效应  

Magnetocaloric Effect of Mn_(1.35)Fe_(0.65)P_(0.45)Si_(0.55)B_x Alloys

作　　者：阿日木申 松林[1] 吴文彬[1] 宋志强[1] 徐萌[1] 特古斯[1] 

机构地区：[1]内蒙古师范大学功能材料物理与化学自治区重点实验室,内蒙古呼和浩特010022

出　　处：《金属功能材料》2014年第1期5-8,共4页Metallic Functional Materials

基　　金：国家自然科学基金资助(项目号51161016)

摘　　要：对Mn1.35Fe0.65P0.45Si0.55Bx(x=0,0.01,0.02,0.03,0.04)合金的结构和磁热效应(MCE)进行了研究。XRD分析结果表明:Mn1.35Fe0.65P0.45Si0.55Bx(x=0,0.01,0.02,0.03,0.04)的合金均为Fe2P型六角结构,空间群为P6-2 m,并随着B元素(原子分数)的增加,晶格常数a增大,c/a减小,晶胞体积V略有减小。磁性测量表明:随着B元素(原子分数)的增加,Curie温度(Tc)从228K升高到315K,热滞(ΔThys)变化不大。0~1.5T外磁场下最大磁熵变(-ΔSmax M)下降,分别为3.6,2.5,2.0,1.7,1.9J/(kg·K)。Structure and magnetocaloric effect（MCE）of the Mn1.35Fe0.65P0.45Si0.55Bx（x= 0, 0.01, 0.02, 0.03 and 0.04, atomic fraction）alloys have been investigated. XRD result shows that the Mn1.35Fe0.65P0.45Si0.55Bx（x= 0, 0.01, 0.02, 0.03 and 0.04） alloys mainly consist of the Fe2 P-type hexagonal structure phase with space group P62 m. With increasing x lattice parameter a increases while lattice parameter c decreases, unit cell volume V de- creases slightly. The magnetic measurements show that the Curie temperature increases from 228 to 315 K, while the thermal hysteresis has little change. The maximum magnetic entropy change, in a magnetic field change of 0-- 1.5 T, decrease slightly with increasing boron content and their values are 3.6, 2.5, 2.0, 1.7 and 1.9 J/（kg· K）, respectively

关 键 词：居里温度 磁热效应 热滞 相变 磁熵变 

分 类 号：TB66[一般工业技术—制冷工程]