【作者】 孙凯； 陈东风； 勾成； 王芳卫； 严启伟； 张泮霖； 孙向东； 郝延明；

【Author】 SUN Kai, CHEN Dong-feng, GOU Cheng, WANG Fang-wei, VAN Qi-wei, ZHANG Pan-lin, SUN Xiang-dong, HAD Yan-ming( China Institute of Atomic Energy, PO. Box 275-30,Bejing 102413, China; Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080,China)

【机构】 中国原子能科学研究院核物理研究所； 中国科学院物理研究所；

【摘要】 用中子衍射方法研究2:17型稀土铁基化合物Er₂Fe₁₅Mn₂C的晶体结构和磁结构.研究结果表明:Er₂Fe₁₅Mn₂C是Th₂Ni₁₇型六角结构,空间群为P6₃/mmc,居里温度Tc=349K,Mn原子在12k、12j、6g和4f四个晶位均发生替代,占位数分别为0.039、0.168、0.022和0.336.室温下Er₂Fe₁₅Mn₂C处于顺磁态.所有磁性原子的磁矩都位于垂直于六重轴的平面内,Er次晶格的磁矩方向与（Fe,Mn）次晶格的相反.更多还原

【Abstract】 The crystallographic and magnetic structures of Er2Fe15Mn2C have been refined by Rietveld analysis of neutron diffraction data at room temperature. The refined results indicate that Er2Fe,5Mn2C alloy has Th2Ni17 type (space group: P63/mmc) hexagonal structure, and the occupancy factors of manganese atoms are 0.039,0.168,0.022 and 0.336 at the 12k, 12j, 6g and 4f positions respectively. Er2Fe15Mn2C is paramagnetic at room temperature. The moments lie in the plane perpendicular to the six-fold axis and exhibit planar magnetic anisotropy in Er2Fe15Mn2C. The value of Curie temperature Tc is 349K. The relation between magnetic properties and structures is discussed.更多还原