MnFeP_(0.63)Ge(0.12)Si_(0.25)B_x(x=0,0.01,0.02,0.03)化合物的磁热效应  

MAGNETOCALORIC EFFECT IN MnFeP_(0.63)Ge_(0.12)Si_(0.25)B_x(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] 毕力格[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,呼和浩特010022

出　　处：《金属学报》2011年第3期344-348,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目50961010;内蒙古自然科学基金项目20080404ZD09;内蒙古师范大学研究生科研创新基金项目CXJJS10034资助~~

摘　　要：对MnFeP_(0.63)Ge_(0.12)Si_(0.25)B_x(x=0,0.01,0.02,0.03,原子分数)化合物的结构和磁热效应(MCE)进行了研究.XRD分析结果表明:MnFeP_(0.63)Ge_(0.12)Si_(0.25)B_x(x=0,0.01,0.02,0.03)的主相均为Fe_2P型六角结构,空间群为P62m.随着B含量的增加晶格常数a增大c减小,晶胞体积基本保持不变.磁性测量表明:随着B含量由0增加到0.03时,Curie温度(T_C)从300 K升到347 K,热滞分别为20,17,11和6 K.0-1.5 T外磁场下最大磁熵变△S_M分别为14.83,11.41,11.26和11.8 J/(kg·K).Structural and magnetocaloric properties of the MnFeP_（0.63）Ge_（0.12）Si_（0.25）B_x（x=0, 0.01,0.02,0.03,atomic fraction） compounds have been investigated.XRD result shows that the MnFeP_（0.63）Ge_（0.12）Si_（0.25）B_x（x=0,0.01,0.02,0.03） compounds mainly consist of the Fe_2P-type hexagonal structure phase with space group P62m.It is found that the lattice parameter a increases and the lattice parameter c slightly decreases with increasing x,and the unit cell volume does not change.The magnetic measurements show that the Curie temperature increases from 300 K to 347 K,and thermal hysteresis are 20,17,11 and 6 K for x= 0 to 0.03.The maximum values of the magnetic entropy change are 11.41,11.26 and 11.8 J/（kg·K）,respectively,for 0—1.5 T fields.

关 键 词：磁热效应 热滞 CURIE温度 相变 

分 类 号：TM271.4[一般工业技术—材料科学与工程]