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An x-ray diffraction study and calculation of the exchange interaction constant between the rare-earth sublattice and the 3d sublattice of Dy 2 Fe 17- x Al x compounds

1999; IOP Publishing; Volume: 11; Issue: 32 Linguagem: Inglês

10.1088/0953-8984/11/32/303

1361-648X

Hao Yan-Ming, Fangwei Wang, Panlin Zhang, Xiangdong Sun, Qi-Cao Yan,

Rare-earth and actinide compounds

Aluminium-substituted Dy2Fe17-xAlx solid solution has been studied by step x-ray diffraction. A Rietveld analysis of the x-ray diffraction indicates that the Al atoms have a high initial affinity for the 18h site, show a high affinity for the 6c site and 18f site at high Al concentrations and are absent from the 9d site at all Al concentrations. The values of intersublattice magnetic coupling constant, JR,T/k, are calculated by the molecular field model according to the result of a Rietveld analysis of the x-ray diffraction.