MnFe_(1-x)Ti_(x)P_(0.77)Ge_(0.23)化合物的结构与磁性  

Structure and magnetic properties of MnFe_(1-x)Ti_(x)P_(0.77)Ge_(0.23)compounds

作　　者：王欣宁 迪立新 伊博乐 欧志强[1,2] 哈斯朝鲁 李英杰[1,2] 特古斯 WANG Xinning;DI Lixin;HYibole;OU Zhiqiang;OHaschaolu;LI Yingjie;OTegus(Physics and Electronic Information College,Inner Mongolia Normal University,Hohhot 010022,China;Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials,Hohhot 010022,China)

机构地区：[1]内蒙古师范大学物理与电子信息学院,呼和浩特010022 [2]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：《功能材料》2024年第4期4135-4141,4178,共8页Journal of Functional Materials

基　　金：国家自然科学基金项目(51461035,11864031,11404176);内蒙古自然科学基金联合基金项目(2023LHMS05002)。

摘　　要：利用高能球磨法和粉末烧结法制备了MnFe_(1-x)Ti_(x)P_(0.77)Ge_(0.23)(x=0.03,0.04,0.06,0.08,0.09)系列化合物。室温X射线衍射结果表明化合物均呈现Fe_(2)P型六角结构,随着Ti含量的增加,晶格常数a、b减小,晶格常数c增大,晶胞体积有所增大。变温X射线衍射实验结果表明,MnFe_(0.94)Ti_(0.06)P_(0.77)Ge_(0.23)化合物在305~350 K温度区间内发生铁磁到顺磁的相转变,存在磁弹耦合现象。MnFe_(1-x)Ti_(x)P_(0.77)Ge_(0.23)(x=0.03,0.04,0.06,0.08,0.09)化合物的磁性测量结果表明随着Ti含量增加化合物的居里温度降低,热滞变大,最大等温磁熵变减小。The MnFe 1-x Ti_(x)P_(0.77)Ge_(0.23)(x=0.03,0.04,0.06,0.08,0.09)compounds were prepared by high-energy ball milling and powder sintering method.The results of X-ray diffraction at room temperature showed that all the compounds showed a Fe 2P hexagonal structure.With the increase of Ti content,lattice parameters a and b decreased,lattice parameter c increased,and the cell volume increased.Variable temperature X-ray diffraction experiment results showed that MnFe 0.94 Ti 0.06 P_(0.77)Ge_(0.23)compounds within the temperature range 305 K to 350 K in ferromagnetic to paramagnetic phase transition,the phenomenon of magnetoelastic coupling existed.The magnetic measurement results of MnFe 1-x Ti_(x)P_(0.77)Ge_(0.23)(x=0.03,0.04,0.06,0.08,0.09)compounds showed that Curie temperature and thermal hysteresis decreased,and maximum isothermal magnetic entropy decreased with the increase of Ti content.

关 键 词：磁制冷 X射线衍射 变温X射线衍射 磁弹耦合 居里温度 

分 类 号：O482.54[一般工业技术—材料科学与工程]