Synthesis, structure and magnetic properties of Y3Fe5-xAlxO12 garnets prepared by the soft chemical method

Abstract

A study was undertaken about the structural, morphological and magnetic properties at room temperature of crystalline aluminium substituted yttrium iron garnet, YIG (Y3Fe5-xAlxO12 with 1.5< x < 1.7) nanoparticles prepared by polymeric precursormethod at the temperature of 700?C for 2 hours. The single-phase character and the well-defined structure of YIG nanoparticles were confirmed by X-ray diffraction, excluding the presence of any other phases. The Raman spectra showed that the changes of lattice vibration would influence interaction between the Fe ion and the host. Mean crystallite size of the single-phase powder was about 46-65 nm. Particles? morphology was investigated by high-resolution transmission electron microscopy, which shows that the particles were agglomerated. From hysteresis loops, particles? efficiency range from 91.4% to 95.9% as Fe/Al ratio decreases. Saturation magnetization was affected by the particle size and Fe/Al stoichiometric ratio. We observe that the saturation magnetization increases as the Fe/Al ratio is raised due to enhancement of the surface spin effects.

Application of Ion‐Doped Y3Fe5O12 Nanoparticles for Self‐Controlled Magnetic Hyperthermia

“…The presented numerical results are in good agreement with the experimental results in other studies. [ 16,40 ] . Thus we can determine more candidates of ion‐doped YIG MNPs for medical applications: For YAlG: d ( x = 1.67) = 26.0 nm; d ( x = 1.71) = 28.0 nm; YGaG: d ( x = 1.52) = 20.0 nm; and d ( x = 1.57) = 22.0 nm and d ( x = 1.62) = 26.0 nm; YScG: d ( x = 1.04) = 22.0 nm; d ( x = 1.06) = 24 nm; and d ( x = 1.085) = 28.0 nm.…”

“…The presented numerical results are in good agreement with the experimental results in other studies. [16,40] . Thus we can determine more candidates of ion-doped YIG MNPs for medical applications: For YAlG: d (x ¼ 1.67) ¼ 26.0 nm; d (x ¼ 1.71) ¼ 28.0 nm; It must be noted that our numerical calculations show that below 17-19 nm, mixed-YIG magnetic NPs pass into a superparamagnetic state and the heating process stops, which is in agreement with experimental results.…”

Bioactivity evaluation of nanosized ZnFe2O4 fabricated by hydrothermal method

“…Tradi-tional cancer therapies such as surgery, chemotherapy and radiotherapy are often invasive, aggressive and debilitating to patient's health. Hence, an alternative to reduce their side effects and even improve efficiency is to combine them with new treatments [23,24].…”

Structural, Optical and Magnetic Properties of YIG Doped with Erbium and Terbium Nanofilms using Sol-Gel Method

“…The garnet structure is compliant with many substitutions which would lead to different application needs. Recently, many reports have been done in substituting Bi 3+ , Ce 3+ or other rare earth (R) ions with Y 3+ and replacement of Fe 3+ ions by Al 3+ and Ga 3+ ions [10][11][12][13][14][15][16]. The substitution of terbium ions into garnet crystal at high content is restricted due to the large ionic radius of terbium compared with yttrium ions.…”