CALCULATION OF THE EXCHANGE INTERACTION CONSTANT BETWEEN RARE-EARTH AND TRANSITION METAL SUBLATTICES IN R2Fe17-xAlx (R=Tb, Gd AND Dy) COMPOUNDS

金属学报(英文版), 2002, 15(4): 401-404.

^1, , ^2, , ^3, , ^4, , ^5,

1.Department of Physics, Tianjin Normal University, Tianjin 300074, China

2.School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China

3.Department of Physics, Tianjin Normal University, Tianjin 300074, China

4.School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China

5.School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China

基金项目: 河北省教育厅科研项目(2001108)

CALCULATION OF THE EXCHANGE INTERACTION CONSTANT BETWEEN RARE-EARTH AND TRANSITION METAL SUBLATTICES IN R2Fe17-xAlx (R=Tb, Gd AND Dy) COMPOUNDS

Keywords： neutron diffraction

An approximate calculation of the exchange interaction constant JRT between therore-earth sublattice and the transition metal sublattice in R2Fe17-xAlx (R=Tb, Gd,and Dy) compounds is given by the molecular-field model and the results of neutrondiffraction. The calculated values, -JR,T/k, for Dy2Fe17-xAlx (x=5, 6, 7 and 8),Tb2Fe10Al7, Gd2Fe17-xAlx (x=7, 8) compounds are 8.62K, 8.64K, 9.52K, 10.34Kand 10.66K, 10.65K, and 9.85K, respectively, they are in agreement with the ex-perimental values, -JR,T/k, of Dy2Fe17-xAlx (x=5, 6, 7 and 8), Tb2Fe10Al7 andGd2Fe17-xAlx (x=7, 8) compounds, which are 8.77K, 9.25K, 10.1K, 10.9K and10.35K, 10.1K, and 10.3K, respectively. The origins of the difference between thecalculated and the experimental results are discussed.

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CALCULATION OF THE EXCHANGE INTERACTION CONSTANT BETWEEN RARE-EARTH AND TRANSITION METAL SUBLATTICES IN R2Fe17-xAlx (R=Tb, Gd AND Dy) COMPOUNDS

参考文献