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An approximate calculation of the exchange interaction constant JRT between the rare-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 neutron diffraction. 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, 10.34K and 10.66K, 10.65K, and 9.85K, respectively, they are in agreement with the experimental values, -JR,T/k, of Dy2Fe17-xAlx (x=5, 6, 7 and 8), Tb2Fe10Al7 and Gd2Fe17-xAlx (x=7, 8) compounds, which are 8.77K, 9.25K, 10.1K, 10.9K and 10.35K, 10.1K, and 10.3K, respectively. The origins of the difference between the calculated and the experimental results are discussed.
An approximate calculation of the exchange interaction constant JRT between the rare-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 neutron diffraction. The calculated values, -JR, T / k for Dy2Fe17-xAlx (x = 5,6,7 and 8), Tb2Fe10Al7, Gd2Fe17-xAlx 10.34K and 10.66K, 10.65K, and 9.85K, respectively, they are in agreement with the experimental values, -JR, T / k, of Dy2Fe17-xAlx (x = 5, 6, 7 and 8), Tb2Fe10Al7 and Gd2Fe17 The origins of the difference between the calculated and the experimental results are - x Alx (x = 7,8) compounds, which are 8.77K, 9.25K, 10.1K, 10.9K and 10.35K, 10.1K, and 10.3K respectively. discussed.