Y3Fe5O12 Nanoparticles Research Articles

New EM Transmitter with Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> Based Magnetic Feeders Potentially Used for Seabed Logging Application

Sea bed logging (SBL) is a new technique for detection of deep target hydrocarbon reservoir. Powerful electromagnetic (EM) transmitter is required for the transmission of EM signal underneath the seabed. New aluminum transmitter with yttrium iron garnet (Y3Fe5O12) based magnetic feeders was used in a scale tank to increase the magnitude of the magnetic field. Yttrium iron garnet samples were prepared using self combustion technique at different sintering temperatures of 750°C, 950°C and 1150°C. Characterizations of Y3Fe5O12 samples were done by using XRD, RAMAN, FESEM and Impedence network analyser. X-ray diffraction results revealed that yttrium iron garnet phase with good crystallinity appeared at sintering temperature of 1150°C. Nanoparticles size ranging from 60 to 110 nm was investigated. Raman results also confirmed garnet structure of yttrium iron garnet at sintering temperature of 1150°C. Field emission scanning electron microscopy (FESEM) was used to image the morphology of the Y3Fe5O12 nanoparticles. Magnetic properties of Y3Fe5O12 magnetic feeders illustrates that Y3Fe5O12 has high Initial permeability (58.054), high Q-factor (59.842) and low loss factor (0.0003) at sintering temperature of 1150°C. Y3Fe5O12 magnetic feeders with high Q factor were chosen for new aluminum EM transmitter. Experiments with a scale factor of 2000 were carried out in scaled tank. It was found that Al transmitter with Y3Fe5O12 magnetic feeders increased magnitude of magnetic field strength up to 180%.

Synthesis and magnetic properties of YFeO3 nanocrystals

YFeO3 nanocrystals have been prepared via coprecipitation of yttrium and iron(III) chlorides with aqueous ammonia. The average size, morphology, and magnetic properties of the YFeO3 nanoparticles are shown to be highly dependent on the preparation procedure.

Modification of yttrium-iron-oxide nanoparticle films using inductively-coupled plasma annealing

Modification of yttrium-iron-oxide (Y3Fe5O12) nanoparticle films has been performed using inductively-coupled RF plasmas. Plasma density of the inductively-coupled RF plasmas, which were used for modification, was as high as 1013 cm−3 at the plasma generation region. The Y3Fe5O12 nanoparticle films exposed to the argon plasmas showed a phase separation into Fe2O3, Y2O3 and Fe phases. However, it was found that the addition of oxygen gas to the argon plasmas (argon/oxygen mixture plasmas) showed effective suppression of the phase separation during the plasma annealing of the Y3Fe5O12 nano particles to obtain the garnet phase (YIG).

A structural and Mössbauer study of Y3Fe5O12 nanoparticles prepared with high energy ball milling and subsequent sintering

The influence of ball milling and subsequent sintering of a 3:5 molar mixture of Y2O3 and α-Fe2O3 on the formation of nanocrystalline Y3Fe5O12 (YIG) particles is studied. Pre-milling the mixture for 100 h lowers the onset temperature at which the material forms to 900°C which is 200°C lower than that reported when a similar mixture of reactants was premilled for shorter times. A single-phased nanocrystalline Y3Fe5O12 phase develops as a sole product when the pre-milled mixture is heated at 1,000°C (12 h). This temperature is ~300–400°C lower than those used to prepare the material conventionally. The bulk and surface crystal structure of the nanoparticles is studied with X-ray diffraction, Mossbauer spectroscopy, Atomic Force Microscope (AFM) and X-ray photoelectron spectroscopy.