Abstract
In this paper, Y3AlxFe5-xO12 powders with x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0 were prepared via solid state reaction method. X-ray diffraction, Vibrating Sample Magnetometry, and Mossbauer Spectroscopy were used to study their structural and magnetic properties. The XRD patterns of the samples show single phase structure with decreasing lattice constant when increasing Al concentration. The saturation magnetization decreases from 28.0 to 10.1 emu/g with increasing Al3+ from 0.0 to 1.0 due to the reduction of the superexchange interactions between iron ions in the a and d sublattices. Room temperature Mossbauer spectra for the samples were collected and analyzed. The hyperfine field values for octahedral and tetrahedral sites of the samples decreased with increasing Al concentration. Moreover, Mossbauer results have shown that Al3+ ions prefer to replace Fe+3 at the octahedral sites.
Highlights
Yttrium iron garnet (YIG) has received intensive studies since its discovery in 19561
The analysis revealed the presence of a single garnet phase without any impurity phase
These results indicated that the Al substitution in YIG resulted in a small reduction of the particle size, uniform particle shape, and narrow particle size distribution
Summary
Yttrium iron garnet (YIG) has received intensive studies since its discovery in 19561. In a more recent study, Kim et al have investigated the magnetic and structural properties of the substituted Y3Fe5-xAlxO12 (x = 0.0, 0.25, 0.50, 0.75, and 1.0) garnets prepared by sol-gel method. In their study, both the lattice constant a and the saturation magnetization Ms decreased with increasing Al concentration. RT Mössbauer spectra for the samples with 0 ≤ x ≤ 0.8 were fitted with three magnetic components, two corresponding to octahedral sites and one to tetrahedral sites[15]. Mössbauer spectra for synthesized garnets were fitted with different numbers of components corresponding to Fe3+ in octahedral and tetrahedral sites. The spectra were calibrated using room temperature Mössbauer spectrum of α-Fe foil, and analyzed using fitting routines based on least-squares analysis
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