The Structural and the Magnetic Properties of Aluminum Substituted Yttrium Iron Garnet

Abstract

In this paper, Y 3 Al x Fe 5-x O 12 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 Mössbauer 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 Al 3+ 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 Mössbauer 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, Mössbauer results have shown that Al 3+ ions prefer to replace Fe +3 at the octahedral sites.

Effect of Al-substitution on Structural and Magnetic Properties of Er3Fe5-xAlxO12 Garnets

“…4 shows a monotonic decrease of the lattice constant (a) for Er 3 Fe 5-x Al x O 12 as x increases. The lattice constant of 12.346 Å for the sample with x = 0.0 is in good agreement with reported value for Er 3 Fe 5 O 12 [1], and the observed decrease with the increase of Al 3+ content is consistent with the reported decrease of lattice constant of Y 3 Fe 5-x Al x O 12 with the increase of x [19]. This decrease, which also results in a monotonic decrease of the unit cell volume as shown in Fig.…”

“…Different synthesis routes and heat treatments were adopted for the preparation of iron garnets, including sol-gel method [12,16,17], co-precipitation method [18], and ball milling [13,14,[19][20][21]. Even though YIG garnets with different scenarios of substitution for Fe 3+ , and/ or Y 3+ ions by other rare earth ions were synthesized and carefully characterized, to our best knowledge, no reports were provided on the synthesis and characterization of erbium iron garnet with partial substitution of Fe 3+ ions by Al 3+ ions.…”