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Tb₂AlFe_16-xMn_x化合物的结构、磁性及正电子湮没谱研究

The structure,magnetic properties,and positron annihilation spectra of Tb₂AlFe_16-xMn_x compounds

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【Author】 Hao Yan-Ming~(1)) Yan Da-Li~(2)) Fu Bin~(2)) Wang Li-Qun~(2)) Hao Xiao-Peng~(3)) Wang Bao-Yi~(3))1)(College of Science,Tianjin University of Science & Technology,Tianjin 300222,China)2)(Department of Physics,Tianjin Normal University,Tianjin 300384,China)3)(Key Laboratory of Nuclear Analysis Techniques,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China)

【机构】天津科技大学理学院物理部；天津师范大学物理系；中国科学院高能物理研究所核分析技术重点实验室；

【摘要】通过X射线衍射、磁测量及正电子湮没谱等手段研究了Tb2AlFe16-xMnx(x=1—8)化合物的结构和磁性.X射线衍射研究结果表明Tb2AlFe16-xMnx化合物具有六角相的Th2Ni17型结构.室温下的正电子湮没实验研究表明,Mn对Fe的替代导致化合物中的铁磁相互作用减弱,并且化合物中存在着较强烈的磁弹耦合效应.磁测量研究结果表明,Mn的替代导致Tb2AlFe16-xMnx化合物的居里温度及自发磁化强度急剧下降.更多还原

【Abstract】 The structural and magnetic properties have been investigated by means of X-ray diffraction,magnetization measurements,and positron annihilation technique.The X-ray diffraction shows that the Tb₂AlFe_16-xMn_x（x=1—8） compounds have a hexagonal Th₂Ni₁₇-type structure.The positron annihilation spectra show that Mn substitution for Fe has the ferromagnetic interaction decreased,and that there exists a strong magnetoelastic effect in Tb₂AlFe_16-xMn_x compound.The magnetization measurement shows that the Curie temperature and the spontaneous magnetization of Tb₂AlFe_16-xMn_x compounds decrease rapidly with increasing x.更多还原