MnFe_(1-x)Ti_xP_(0.63)Ge_(0.12)Si_(0.25)(x=0,0.01,0.02,0.03)系列化合物的磁热效应  

Magnetocaloric Effect of MnFe_(1-x)Ti_xP_(0.63)Ge_(0.12)Si_(0.25)(x=0,0.01,0.02,0.03) Compounds

作　　者：王冬梅[1] 松林[1] 王耀辉[1] 张伟[1] 耿遥祥[1] 特古斯[1] 

机构地区：[1]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：《稀有金属》2012年第1期87-91,共5页Chinese Journal of Rare Metals

基　　金：国家自然科学基金资助项目(50961010);内蒙古自然科学基金资助项目(20080404ZD09)

摘　　要：通过X射线衍射分析(XRD)和振动磁强计(VSM)磁性测量,研究了替代元素Ti替代Fe元素含量的MnFe1-xTixP0.63Ge0.12Si0.25(x=0,0.01,0.02,0.03)系列化合物的物相结构与磁热效应的影响。结果表明:该系列化合物的结构为Fe2P型六角晶系结构,空间群为P62m。主相均为(Mn,Fe)2(P,Ge,Si),并含有少量的第二相(Mn,Fe)3Si相。随着Ti原子替代Fe原子的增加化合物的晶格常数a增大,晶格常数c略有减小,晶胞体积V基本保持不变。随着Ti含量增加居里温度(TC)减小,热滞ΔThys的大小改进不太明显。MnFeP0.63Ge0.12Si0.25的TC为305 K,当外磁场变化为0～1.5 T时最大磁熵变的绝对值为14.8 J.(kg.K)-1。The substitution effect of Ti for Fe on the structure and magnetocaloric properties in the MnFe1-xTixP0.63Ge0.12Si0.25（x=0,0.01,0.02,0.03） compounds was investigated by means of X-ray diffraction（XRD） and magnetic measurements.Analysis showed that the MnFe1-xTixP0.63Ge0.12Si0.25（x=0,0.01,0.02,0.03） compounds mainly crystallized in the Fe2P-type hexagonal structure,and a small second phase of（Mn,Fe）3Si was detected in all compounds.It was found that the lattice parameter a increased and the lattice parameter c slightly decreased with increasing x,and the unit cell volume did not obviously change.The Curie temperature decreased with the increase of Ti content and thermal hysteresis did not obviously change.Curie temperature of MnFeP0.63Ge0.12Si0.25 was 305 K and the maximum magnetic entropy was 14.8 J ·（kg · K）-1 for a field change from 0 to 1.5 T.

关 键 词：磁热效应 磁熵变 居里温度 热滞 

分 类 号：TM271.4[一般工业技术—材料科学与工程]