中国物理B ›› 2005, Vol. 14 ›› Issue (4): 818-820.doi: 10.1088/1009-1963/14/4/031

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Spontaneous magnetostriction of Y2Fe16Al compound

郝延明, 赵淼, 周严   

  1. Department of Physics, Tianjin Normal University, Tianjin,300074, China
  • 收稿日期:2004-11-01 修回日期:2004-11-18 出版日期:2005-04-20 发布日期:2005-03-28
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 50271022), by the Excellent YongTeachers Programme of MOE, P. R. C. (Grant No 1999), and by Tianjin Natural Science Foundation of China (Grant No 043602011).

Spontaneous magnetostriction of Y2Fe16Al compound

Hao Yan-Ming (郝延明), Zhao Miao (赵淼), Zhou Yan (周严)   

  1. Department of Physics, Tianjin Normal University, Tianjin 300074, China
  • Received:2004-11-01 Revised:2004-11-18 Online:2005-04-20 Published:2005-03-28
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 50271022), by the Excellent YongTeachers Programme of MOE, P. R. C. (Grant No 1999), and by Tianjin Natural Science Foundation of China (Grant No 043602011).

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摘要： The structure and magnetic properties of Y2Fe16Al compound have been investigated by means of x-ray diffraction and magnetization measurements. The Y2Fe Fe16Al compound has a hexagonal Th$_{2}$Ni$_{17}$-type structure. Negative thermal expansion was found in Y2Fe16Al compound in the temperature range from 332 to 438K by x-ray dilatometry. The coefficient of the average thermal expansion is \alpha =-3.4\times 10-5K-1. The spontaneous magnetostrictive deformations from 293 to 427K have been calculated based on the differences between the experimental values of the lattice parameters and the corresponding values extrapolated from the paramagnetic range. The result shows that the spontaneous volume magnetostrictive deformation \textit{$\omega $}$_{\rm S}$ decreases from 5.4$\times $10-3to near zero with temperature increasing from 293 to 427K, the spontaneous linear magnetostrictive deformation \textit{$\lambda $}$_{\rm c}$ along the $c$ axis is much larger than the spontaneous linear magnetostrictive deformation \textit{$\lambda $}$_{\rm a}$ in basal-plane in the same temperature range except near 427K.

Abstract: The structure and magnetic properties of Y2Fe16Al compound have been investigated by means of x-ray diffraction and magnetization measurements. The Y2Fe Fe16Al compound has a hexagonal Th$_{2}$Ni$_{17}$-type structure. Negative thermal expansion was found in Y2Fe16Al compound in the temperature range from 332 to 438K by x-ray dilatometry. The coefficient of the average thermal expansion is $\bar{\alpha} =-3.4\times$ 10-5K-1. The spontaneous magnetostrictive deformations from 293 to 427K have been calculated based on the differences between the experimental values of the lattice parameters and the corresponding values extrapolated from the paramagnetic range. The result shows that the spontaneous volume magnetostrictive deformation $\omega _{\rm S}$ decreases from 5.4$\times $10-3to near zero with temperature increasing from 293 to 427K, the spontaneous linear magnetostrictive deformation $\lambda_{\rm c}$ along the $c$ axis is much larger than the spontaneous linear magnetostrictive deformation $\lambda _{\rm a}$ in basal-plane in the same temperature range except near 427K.

Key words: Y2Fe16Al compound, negative thermal expansion, spontaneous magnetostriction

中图分类号:  (Magnetomechanical effects, magnetostriction)

  • 75.80.+q
75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 61.66.Dk (Alloys ) 65.40.De (Thermal expansion; thermomechanical effects) 61.05.cp (X-ray diffraction)