中国物理B ›› 1995, Vol. 4 ›› Issue (9): 676-681.doi: 10.1088/1004-423X/4/9/005

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NEUTRON-POWDER-DIFFRACTION STUDY OF THE STRUCTURE AND MAGNETIC PROPERTIES OF Nd2Fe14Si3

勾成1, 陈东风1, 张志友2, 孙向东3, 张泮霖3, 成昭华3   

  1. (1)Chinese Institute of Atomic Energy, Beijing 102413 , China; (2)Department of Physics, yantai University, Yantai 264005 , China; (3)Institute of Physics, Academia Sinica, Beijing 100080, China
  • 收稿日期:1995-03-02 出版日期:1995-09-20 发布日期:1995-09-20

NEUTRON-POWDER-DIFFRACTION STUDY OF THE STRUCTURE AND MAGNETIC PROPERTIES OF Nd2Fe14Si3

ZHANG ZHI-YOU (张志友)a, SUN XIANG-DONG (孙向东)b, ZHANG PAN-LIN (张泮霖)b, CHENG ZHAO-HUA (成昭华)b, GOU CHENG (勾成)c, CHEN DONG-FENG (陈东风)c   

  1. a Department of Physics, yantai University, Yantai 264005 , China; b Institute of Physics, Academia Sinica, Beijing 100080, China; c Chinese Institute of Atomic Energy, Beijing 102413 , China
  • Received:1995-03-02 Online:1995-09-20 Published:1995-09-20

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摘要： The crystal and magnetic structures of Nd2Fe14Si3 at room temperature were refined by Rietveld analysis of neutron-powder-diffraction data. It was found that silicon atoms occupy preferentially both 18h and 18f of Th2Zn17-type structure with occupancies 0.36 and 0.14, respectively, The Fe-Fe bond-lengths computed with the refined crystallographic parameters have optimum values, as compared with those of Nd2Fe17 compounds, which can explain well why the Curie temperature rises strongly when the unit cell volume reduces with the substitution of silicon for iron in Nd2Fe17.

Abstract: The crystal and magnetic structures of Nd2Fe14Si3 at room temperature were refined by Rietveld analysis of neutron-powder-diffraction data. It was found that silicon atoms occupy preferentially both 18h and 18f of Th2Zn17-type structure with occupancies 0.36 and 0.14, respectively, The Fe-Fe bond-lengths computed with the refined crystallographic parameters have optimum values, as compared with those of Nd2Fe17 compounds, which can explain well why the Curie temperature rises strongly when the unit cell volume reduces with the substitution of silicon for iron in Nd2Fe17.

中图分类号:  (Alloys )

  • 61.66.Dk
75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 75.50.Bb (Fe and its alloys) 75.50.Ee (Antiferromagnetics)