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N在Nd₂Fe₁₄BN_x永磁合金中占位的中子衍射分析

Neutron Diffraction Study on the Sites Occupation of N in Nd₂Fe₁₄ BN_x Alloy

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【Author】 DU Hong lin 1, ZHANG Bai sheng 1, JI Chang guo 2, YANG Ying chang 2 (1 China Institute of Atomic Energy, P. O. Box 275 30,Beijing 102413, China; 2 Physics Department, Peking University, Beijing 100871, China)

【机构】中国原子能科学研究院核物理研究所!北京102413；

【摘要】利用自编的FORTRAN程序和Nd2 Fe14 BNx 样品的中子衍射拟合的初步结果 ,确定了单从空间距离考虑的可能的氮原子的占位。用尝试法按其空间群表中对称性由高到低对所有的氮的可能占位进行了拟合比较 ,确定出氮原子进入了Nd2 Fe14 B四方结构中的 4e( 0 ,0 ,0 .0 990 )和4f( 0 .0 972 ,0 .0 972 ,0 )间隙晶位 ,并对其磁结构进行了研究。更多还原

【Abstract】 The neutron diffraction data of Nd 2Fe 14 BN x is preliminarily fitted. By using of the results and a small FORTRAN program, the distances of arbitrary coordinates to every atom in the structure are calculated, and so the possible sites of N atoms in the structure, for distances thinking just, are determined. After every possibility is fitted and studied by trail and error method, the N atoms are finally found to enter the interstitial sites 4e(0,0,0.099 0) and 4f(0.097 2, 0.097 2 ,0) of the tetragonal structure. The magnetic structure is also studied.更多还原