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

Acta Metallurgica Sinica (English Letters) ›› 2002, Vol. 15 ›› Issue (4): 401-404 .

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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

Y.M. Hao

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

Received:2001-09-11 Revised:2001-12-04 Online:2002-08-25 Published:2009-10-10
Contact: Y.M. Hao

Abstract

Abstract: 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.

Key words: neutron diffraction, magnetic coupling constant, molecular-fieldmodel, two-sublattice model

Y.M. Hao. CALCULATION OF THE EXCHANGE INTERACTION CONSTANT BETWEEN RARE-EARTH AND TRANSITION METAL SUBLATTICES IN R2Fe17-xAlx (R=Tb, Gd AND Dy) COMPOUNDS[J]. Acta Metallurgica Sinica (English Letters), 2002, 15(4): 401-404 .

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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

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