(Mn_(1-x)Co_x)_(65)Ge_(35)(x=0.2～0.5)合金的磁热效应  

Magnetocaloric Effect in (Mn_(1-x)Co_x)_(65)Ge_(35)(x=0.2～0.5) Alloys

作　　者：李福安[1] 松林[1] 王高峰[1] 哈斯朝鲁[1] 李新文[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,内蒙古呼和浩特010022

出　　处：《内蒙古师范大学学报（自然科学汉文版）》2008年第2期182-184,共3页Journal of Inner Mongolia Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50261003);内蒙古高等学校科学研究项目(NJ05101)

摘　　要：在氩气的保护下用熔炼法制备了（Mn1-xCox）65Ge35系列合金．通过X射线衍射和振动样品磁强计研究了样品的结构和磁熵变．结果表明．（Mn1-xCox）65Ge35系列合金在Co含量x=0．2时,样品为正交结构,磁矩反铁磁排列；当Co含量0．2≤x≤0．5时，样品为六角结构，磁矩铁磁排列．随着Co含量的增加．合金的居里温度在250302K范围内变化．在低磁场（0—1．5T）下．（Mn1-xCox）65Ge35系列合金的最大等温磁熵变为1．7J·kg^-1·K^-1．A series of （Mn1-xCox）65Ge35 alloys were prepared by the arc melting under the purified argon atmosphere. The structure and magnetic entropy changes in （Mn1-xCox）65Ge35 alloys were investigated by means of X-ray diffraction pattern and VSM. The results show that the crystal structure is orthorhombic and antiferromagnetic for x=0. 2 but hexagonal and ferromagnetic for 0.2≤x≤0.5. The Curie temperature of （Mn1-xCox）65Ge35 alloys are varied between 250 K and 302 K with the increase of the content of Co. The largest magnetic entropy change is 1.7J · kg^-1· K^-1 for a magnetic field change from 0 to 1.5 T in all alloys.

关 键 词：合金 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]