Abstract
The magnetic properties of Y 2Fe 17− x Ga x for 3≤ x≤7 and Gd 2Fe 17− x Ga x for 5≤ x≤7 have been investigated using 57Fe Mössbauer spectroscopy. These compounds have the rhombohedral Th 2Zn 17 structure. X-ray diffraction analysis of aligned powders shows that the easy direction of magnetization is parallel to the c-axis in Y 2Fe 10Ga 7 and Gd 2Fe 10Ga 7 and is perpendicular to the c-axis in Y 2Fe 14Ga 3, Y 2Fe 12Ga 5, Gd 2Fe 12Ga 5 and Gd 2Fe 11Ga 6. Mössbauer studies indicate that those samples are ordered ferromagnetically. The 57Fe hyperfine field decreases with increasing Ga content. This decrease results from the decreased magnetic exchange interactions resulting from Ga substitution. The average isomer shift, δ, for R 2Fe 17− x Ga x (R=Y and Gd) at room temperature is positive and the magnitude of δ increases with increasing Ga content.
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