Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
권호 표지

Magnetic properties and crystal structures of $Sm_yGd_{2-y}Fe_{17-x}Si_x$ alloys prepared by induction melting

  • Nam Joong-Hee (System Module Group, Korea Institute of Ceramic Engineering and Technology)
  • Published : 2006.02.01
Download PDF
⟨ Previous Next ⟩

Abstract

The magnetic properties and crystal structures of $Sm_yGd_{2-y}Fe_{17-x}Si_x$ alloys ($0\leq\;x\leq2\;and\;y=0\~1.67$) have been investigated using x-ray diffraction and magnetic measurements. The $Sm_yGd_{2-y}Fe_{17-x}Si_x$ specimens were crystallized to the rhombohedral $Th_2Zn_{17}-structure$ with less than $5mol\%$ of impurities. The unit cells of the mixed rare-earth samples are smaller than those of $Sm_2Fe_{17}\;and\;Gd_2Fe_{17}.$ For example, the $T_c\;of\;SmGdFe_{17}\;(255^{\circ}C)$ is approximately 160 and $800^{\circ}C)$ higher than that of $Sm_2Fe_{17}\;and\;Gd_2Fe_{17},$ respectively. The $T_cs$ measured for $Sm_yGd_{2-y}Fe_{17-x}Si_x$ samples, 280 to $290^{\circ}C)$, are among the highest values observed for a $R_2Fe_{17-x}M_x$ intermetallic where M is a substituent other than cobalt.

Keywords

References

  1. K.H.J. Buschow, in Interstitial Intermetallic Alloys, edited by F. Grandjean, G.J. Long and K.H.J. Buschow (Kluwer Academic Publishers, Boston, 1995) pp. 349-409
  2. G.K. Marasinghe, O.A. Pringle, G.J. Long, W.B. Yelon and F. Grandjean, 'A neutron diffraction and Mossbauer spectral study of the structure and magnetic properties of the $Y_2Fe_{14-x}Si_xB$ solid solutions', J. Appl. Phys. 76 (1994) 2960 https://doi.org/10.1063/1.357536
  3. G.K. Marasinghe, O.A. Pringle, G.J. Long, W.J. James, D. Xie, J. Li, W.B. Yelon and F. Grandjean, 'Neutron-diffraction and Mossbauer effect study of the preferential silicon site occupation and magnetic structure of $Nd_2Fe_{14-x}Si_xB$', J. Appl. Phys. 76 (1994) 2960 https://doi.org/10.1063/1.357536
  4. P.C. Ezekwenna, G.K. Marasinghe, W.J. James, O.A. Pringle, H. Luo, Z. Hu, Y.B. Yelon and Ph. l'Heritier, 'Magnetic and structural properties of $Nd_2Fe_{17-x}Mn_x$ solid solutions', J. Appl. Phys. 81(8) (1997) 4533 https://doi.org/10.1063/1.364885
  5. P.C. Ezekwenna, G.K. Marasinghe, J.H. Nam, W.J. James, Y.B. Yelon, M. Ellouze and Ph. l'Heritier, 'A magnetic and crystallographic study of $(Sm/Gd)_2Fe_{17-y}Si_yC_z$ solid solutions', J. Appl. Phys. 87(9) (2000) 6716 https://doi.org/10.1063/1.372818
  6. Z. Hu, W.B. Yelon, et al., 'A magnetic, neutron diffraction, and Mossbauer spectral study of $Nd_2Fe_{15}Ga_2$ and $Tb_2Fe_{17-x}Ga_x$ solid solutions', J. Appl. Phys. 76 (1994) 443 https://doi.org/10.1063/1.357094
  7. W.B. Yelon, et al., 'Neutron diffraction and Mossbauer effect study of several $Nd_2Fe_{17-x}Al_x$ solid solution', J. Appl. Phys. 73(10) (1993) 6029 https://doi.org/10.1063/1.353459