Comparative study of structure and magnetic properties of micro- and nano-sized Gd Y3−Fe5O12 garnet

Sattar, A. A.; El‐Sayed, H. M.; Faramawy, Ahmed

doi:10.1016/j.jmmm.2016.03.090

Cited by 40 publications

(22 citation statements)

References 24 publications

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“…The Gd-YIG powder with size of nanometer scale was prepared using sol-gel method. Recently, Neel's relaxation at submicron sized Gd-YIG was reported [15]. The different distribution of the surface atoms on the powder affect to quadrupole splitting at and below 13 K. It easily disappeared as increasing measuring temperature [18].…”

Section: +mentioning

confidence: 99%

Magnetic Properties of R-YIG (R = La, Nd, and Gd) Derived by a Sol-gel Method

Uhm¹,

Lim²,

Choi³

et al. 2016

Journal of Magnetics

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Y 3-x R x Fe 5 O 12 (R = La, Nd, and Gd) powder were fabricated using a sol-gel pyrolysis method. Their magnetic properties and crystalline structures were investigated using x-ray diffraction (XRD), a vibrating sample magnetometer (VSM), and Mössbauer Spectrometer. The Mössbauer spectra for the powders were taken at various temperatures ranging from 12 K to Curie temperature (Tc). The isomer shifts indicated that the valence states of Fe ions for the 16(a) and 24(d) sites have a ferric character. The saturation magnetization (Ms) increases from 32 to 34 (emu/g) for the YIG, and Nd-YIG, respectively. However, Ms decreases to 27 (emu/g) at Gd-YIG.

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Section: +mentioning

confidence: 99%

Magnetic Properties of R-YIG (R = La, Nd, and Gd) Derived by a Sol-gel Method

Uhm¹,

Lim²,

Choi³

et al. 2016

Journal of Magnetics

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“…The magnetic properties of the garnets depend on several parameters, such as the composition of the material, the particle size, method and temperature of synthesis [8,9,20]. In the studied case, large size particles were obtained (~3 µm) with low coercivity (˂40 Oe).…”

Section: Resultsmentioning

confidence: 99%

“…Finally, the third tetrahedral site also contains Fe 3+ ions (24d) [5,6,7,8]. The substitution of Y 3+ by magnetic rare earth ions promotes the formation of a new magnetic sub-lattice, which in turn causes the material to have a compensation point below room temperature [9,10]. Furthermore, due to the incorporation of doping cations into the structure of YIG, this causes changes in the magnetic, structural, and magneto-optical properties [11].…”

Section: Introductionmentioning

confidence: 99%

Enhancement in Curie Temperature of Yttrium Iron Garnet by Doping with Neodymium

et al. 2018

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The effect of the substitution of Y3+ by Nd3+ on the structural and magnetic properties of neodymium-doped yttrium iron garnet, NdxY3−xFe5O12 with x in the range of 0–2.5, is presented. Oxide powders of Fe2O3, Nd2O3, and Y2O3 were mixed in a stoichiometric ratio and milled for 5 h using high-energy ball milling, before being uniaxially pressed at 900 MPa and annealed at 1373 K for 2 h to obtain NdxY3−xFe5O12 (0 ≤ x ≤ 2.5). It was found that the mechanical milling of oxides followed by annealing promotes the complete structural formation of the garnet structure. Additionally, the X-ray diffraction patterns confirm the complete introduction of Nd3+ into the garnet structure with a neodymium doping concentration (x) of 0–2.0, which causes a consistent increment in the lattice parameters with the Nd3+ content. When x is higher than 2.0, the yttrium orthoferrite is the predominant phase. Besides, the magnetic results reveal an increase in the Curie temperature (583 K) as the amount of Nd3+ increases, while there was enhanced saturation magnetization as well as modified remanence and coercivity with respect to non-doped YIG.

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“…The substitution of La and Nd at Y site gives rise to increase in saturation magnetization value upto certain concentration of La/Nd and beyond that it decreases . On the other hand, Gd, Dy and Sm substitution results in lower saturation magnetization values . The substitution of smaller concentration of Ce at Y site enhances the sample density and saturation magnetization even for lower sintering temperature .…”

Section: Introductionmentioning

confidence: 99%

“…The magnetic and dielectric properties of YIG by substituting Rare‐earth (R) ions (R = La, Gd, Dy, Nd and Sm) at Y site have been studied by several authors . Similar studies have been carried out by Bi substitution at Y site of YIG .…”

Section: Introductionmentioning

confidence: 99%

Structural, magnetic and dielectric properties of Cr substituted yttrium iron garnets

Aakansha

Ravi

2018

J Am Ceram Soc

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Chromium substituted polycrystalline Yttrium Iron Garnets (Y3Fe5–xCrxO12 with x = 0 to 0.5) were prepared in single‐phase form with lattice constant in the range of 12.3775 Å to 12.3560 Å. All samples exhibit ferrimagnetic transition with transition temperature (Tc) in the range of 547 K for x = 0 to 494 K for x = 0.5. The saturation magnetization value at room temperature is found to increase with Cr concentration that is, from 24.8 to 26.6 emu/g and this is attributed to the preferential occupation of Cr3+ ions at octahedral site of Fe3+ ions. The frequency dependence of impedance data shows the relaxation and thermal activation of charge carriers across grains and grain boundaries. The complex impedance spectra were modeled by considering equivalent circuits having contributions from the resistance and constant phase element due to grains and grain boundaries and capacitance across grain boundaries. The dielectric constant is found to increase from 20 to 52 as the Cr concentration is increased and it is attributed to hopping of charge carriers across Fe2+–Fe3+ centers. The Arrhenius plots of relaxation time of charge carriers and conductivity show an anomaly in the vicinity of ferrimagnetic transition temperature and it highlights the presence of magneto‐electric coupling.

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Comparative study of structure and magnetic properties of micro- and nano-sized Gd Y3−Fe5O12 garnet

Cited by 40 publications

References 24 publications

Magnetic Properties of R-YIG (R = La, Nd, and Gd) Derived by a Sol-gel Method

Magnetic Properties of R-YIG (R = La, Nd, and Gd) Derived by a Sol-gel Method

Enhancement in Curie Temperature of Yttrium Iron Garnet by Doping with Neodymium

Structural, magnetic and dielectric properties of Cr substituted yttrium iron garnets

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