Mn_(1.27)Fe_(0.68)P_(1-x)Si_x合金的批量制备与磁热效应  

Massive Preparation and Magneto-caloric Effect in Mn_(1.27)Fe_(0.68)P_(1-x)Si_x Alloys

作　　者：宋志强[1] 松林[1] 哈斯朝鲁[1] 张伟[1] 刘雨江[1] 葛玉梅[1] 特古斯[1] 

机构地区：[1]内蒙古师范大学物理与电子信息学院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：《内蒙古师范大学学报（自然科学汉文版）》2013年第1期33-35,39,共4页Journal of Inner Mongolia Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50961010;51161016);内蒙古自然科学基金资助项目(20080404ZD01)

摘　　要：采用机械合金化工艺,通过改变成型和退火条件,批量制备了Mn1.27Fe0.68P1-xSix(x=0.50,0.52,0.54,0.56)系列合金,并研究了合金的物相结构和磁热效应.室温(293K)XRD表明,该合金均为Fe2P型六角结构,空间群为P62 m.当x=0.50,0.52,0.54,0.56时,由M-T曲线可知,居里温度TC分别为231,260,277,310K,热滞ΔThys分别为4.7,3.4,2.9,2.4K;在变化的外磁场(0～1.5T)下,由M-B曲线求得合金的最大磁熵变ΔSmax分别为12.0,14.2,7.8,8.1J/(kg.K).A massive preparation method and magneto-caloric effects in Mn1.27Fe0.68P1-xSix（x=0.50,0.52,0.54,0.56） alloys were investigated.The XRD results at room temperature show that the alloys crystallize in the Fe2P-type hexagonal structure with space group of P62m.The Curie temperature determined from the M-T curves is 231,260,277,310 K,the thermal hysteresis is 4.7,3.4,2.9,2.4 K for x=0.50,0.52,0.54,0.56,respectively.The maximal MCE obtained from the curves of isothermal magnetization for magnetic field change from 0 to 1.5 T is 12.0,14.2,7.8,8.1 J/（kg·K）,respectively.

关 键 词：Fe2P合金 磁热效应 相变 居里温度 磁熵变 

分 类 号：O482.54[一般工业技术—材料科学与工程]