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

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1652 ◽  
Author(s):  
Esperanza Baños-López ◽  
Félix Sánchez-De Jesús ◽  
Claudia Cortés-Escobedo ◽  
Arturo Barba-Pingarrón ◽  
Ana Bolarín-Miró
Keyword(s):  
Curie Temperature ◽  
Yttrium Iron Garnet ◽  
High Energy ◽  
Stoichiometric Ratio ◽  
Garnet Structure ◽  
Yttrium Iron ◽  
Structural Formation ◽  
Oxide Powders ◽  
Diffraction Patterns ◽  
Iron Garnet

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.

Synthesis, Structure, Magnetic and Absorption Properties of Nd Doped Y3Fe5O12 Garnets Prepared by Mechanochemical Method

2020 ◽  
Vol 855 ◽  
pp. 52-57
Author(s):  
Didin Sahidin Winatapura ◽  
Ade Mulyawan ◽  
Ari Adi Wisnu ◽  
Yunasfi
Keyword(s):  
Reflection Loss ◽  
Yttrium Iron Garnet ◽  
High Energy ◽  
Compositional Variation ◽  
X Rays ◽  
Yttrium Iron ◽  
Structural Formation ◽  
Neodymium Concentration ◽  
Xrd Patterns ◽  
Iron Garnet

Neodymium substituted yttrium iron garnet (YIG) nanoparticles with compositional variation of NdxY3−xFe5O12 where x = 0.0, 0.2, 0.5 and 0.8 was prepared by mechanochemicals method using high energy milling (HEM). The characterization was done using X-rays diffractometer (XRD), scanning electron microscope (SEM), vibrating sample magnetometer (VSM) and vector network analyzer (VNA). It was found that the mechanical milling followed by sintering promotes the complete structural formation of the yttrium iron garnet (YIG) structure. The XRD patterns confirm the complete introduction of Nd3+ ion into the YIG with an addition of Nd doping concentration. nanocrystalline particles with high purity and sizes ranging from 0.12μm to 0.16μm were obtained. The magnetization value, Ms from all Nd-doped samples were obtained in the range between 34 to 37emu.g-1. The magnetic coercivity (Hc) was achieved of 0.012kOe (12Oe) for the non-doped sample (YNd-0) and then increase with the addition of neodymium concentration. The increase in Hc for all the sample series can be attributed to an enhancement of the magnetocrystalline anisotropy with anisotropic Fe2+. The variation of the reflection loss (RL) versus frequency was observed in Nd doped YIG, Y1-xNdxFe5O12 with x = 0.0 – 0.8 in the frequency range of 7 –12 GHz. The optimum reflection loss (RL) was found to be 8.66(-dB) at 9.5GHz in Y2.2Nd0.8Fe5O12 (YNd-08) for x = 0.8.

scholarly journals Crystalquasichemical Description the Formation of Defects in nanodispersed Yttrium-Iron Garnet

2016 ◽  
Vol 17 (4) ◽  
pp. 621-624
Author(s):  
V.D. Fedoriv ◽  
L.V. Turovska ◽  
I.P. Yaremiy ◽  
N.V. Stashko
Keyword(s):  
Partial Pressure ◽  
Yttrium Iron Garnet ◽  
Sol Gel ◽  
Oxide System ◽  
Garnet Structure ◽  
Partial Pressure Of Oxygen ◽  
Yttrium Iron ◽  
Structure Defects ◽  
Air Atmosphere ◽  
Iron Garnet

By the sol-gel method of autocombustionan initial oxide system was synthesized for a receipt a nanodispersed Yttrium Iron Garnet. It was set that forming of the monophase system Y3Fe5O12 begins at temperatures above 973 К in static air atmosphere. The crystalquasichemical formulas for Y3Fe5O12 are offered. Dependence of concentration of defects from a degree non-stoichiometry of oxygen is calculated. It was set that the formation of garnet structure needed oxygen atmosphere annealing. Partial pressure of oxygen determines the resulting structure defects.

High-energy xenon ion irradiation effects on the electrical properties of yttrium iron garnet (+)

1989 ◽  
Vol 110 (1-2) ◽  
pp. 193-195 ◽  
Author(s):  
J. M. Costantini ◽  
J. L. Flament ◽  
D. Groult ◽  
L. Sinopoli ◽  
F. Studer ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Yttrium Iron Garnet ◽  
Ion Irradiation ◽  
High Energy ◽  
Irradiation Effects ◽  
Yttrium Iron ◽  
Iron Garnet

Synthesis and Spectroscopic Analysis of Ferrimagnetic Yttrium Iron Garnet for Tunable Filter Applications

2017 ◽  
Vol 17 ◽  
pp. 37-43
Author(s):  
Jasper Goldwin ◽  
K. Aravindhan ◽  
V.P. Senthil ◽  
S. Gokul Raj ◽  
G. Ramesh Kumar
Keyword(s):  
Phase Formation ◽  
Yttrium Iron Garnet ◽  
Synthesis Method ◽  
Tunable Filter ◽  
Yttrium Iron ◽  
Oxide Powders ◽  
Microwave Oscillators ◽  
Infrared Spectrometer ◽  
Iron Garnet ◽  
Made In

Yttrium iron garnet (YIG) powdered ceramic powders were synthesized as bulk quantity by traditional solid state synthesis method by the use of yttrium oxide and iron oxide powders. Finely grinded powders were then calcinated for various temperatures such as 900, 1200 oC for 3 hours and 1400oC for 6 hours respectively after making multiple grindings to obtain homogeneity. The calcinated powders were then subjected to phase purity by the use of powder X-ray analysis. As it is clear evident from the samples that the powdered samples were of single phase in nature and that it is clear evident from the nature of the sample which transforms to green in colour from the traditional red iron based oxides. The bonding nature was further ascertained by the used of Fourier transform infrared spectrometer (FTIR) analysis. Thermal stability and phase formation was confirmed through thermal analysis. The thermo-magnetization curve reveals the curie temperature of the sample which is in good agreemement with that of the reported values. Magnetization versus magnetic field curve was obtained which showed increase in magnetization due to the pure phase formation. These preliminary results suggest that the YIG powders could be made in to ceramic pellets for the use of tunable filters in the areas of microwave oscillators.

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