NdFe_(10.5)Mo_(1.5)微观结构变温中子衍射研究  

Neutron Diffraction Study on Microstructure of NdFe_(10.5)Mo_(1.5) at Different Temperatures

作　　者：李峻宏[1] 刘蕴韬[1] 李天富[1] 张莉[1] 韩文泽[1] 高建波[1] 陈东风[1] 杜红林[2] 

机构地区：[1]中国原子能科学研究院核物理研究所,北京102413 [2]北京大学物理学院,北京100871

出　　处：《原子能科学技术》2012年第B09期23-26,共4页Atomic Energy Science and Technology

基　　金：国家重点基础研究发展计划资助项目(2010CB833105);国家自然科学基金资助项目(11175265)

摘　　要：在室温和液氮温度(77K)下,利用中子粉末衍射方法研究了NdFe10.5Mo1.5金属间化合物的晶体结构和磁结构。采用Rietveld峰形精修方法对衍射数据进行拟合。结果表明,NdFe10.5Mo1.5在77K时晶胞参数a比室温时的大,晶胞参数c比室温时的小。NdFe10.5Mo1.5的热膨胀反常现象只用最近邻铁原子间距离和最近邻原子数来解释是不全面的,还应考虑Nd-Fe之间的相互作用,甚至是Nd-Nd间的相互作用。The crystal and magnetic structure of NdFe10.5Mo1.5 intermetallic compound was studied by neutron powder diffraction at room temperature and low temperature（77 K）.The data were analyzed by the Rietveld method.The results of neutron diffraction indicate that the lattice parameter a increases and lattice parameter c decreases for NdFe10.5Mo1.5 compounds when the temperature decreases from room temperature to 77 K.The thermal expansion anomalies of NdFe10.5Mo1.5 could not be explained only by the Fe-Fe interatomic distances and the number of the nearest neighbors of Fe.This implies that not only the direct interaction of Fe-Fe contributes to the phenomenon,Nd-Fe and Nd-Nd indirect interaction also have a contribution to the thermal expansion anomalies.

关 键 词：中子衍射 金属间化合物 微观结构 

分 类 号：O571.56[理学—粒子物理与原子核物理]