Colloidal Particles: Spherical Yttrium Iron Garnet

1998 ◽  
Vol 517 ◽  
Author(s):  
R.H.M. Godoi ◽  
M. Jafelicci ◽  
R.F.C. Marques ◽  
L.C. Varanda
Keyword(s):  
Homogeneous Nucleation ◽  
Colloidal Particles ◽  
Spherical Particles ◽  
Phase Identification ◽  
Yttrium Iron ◽  
X Ray ◽  
Electron Microscopies ◽  
Dispersion Media ◽  
Iron Garnet ◽  
Different Characteristics

AbstractThe purpose of this work is to obtain spherical particles YIG from micrometric to nanometric scales. The spherical particles were obtained from cation hydrolysis in acid medium by adding urea or ammonia in order to carry out a homogeneous nucleation process up to 90°C. Different composition and morphology were achieved by changing reactant concentrations, precipitation agent and stabilizing agent. X-ray diffractometry, electrophoretic mobility, transmission and scanning electron microscopies were carried out on these particles to investigate the phase identification, mobility, morphology and particle size. Crystalline YIG, with spherical characteristics, was obtained. The surface potential presented different characteristics for different dispersion media.

Preparationand Properties of Colloidal Particles. Silica on Yttrium Iron Garnet

1999 ◽  
Vol 581 ◽  
Author(s):  
R.H.M. Godoi ◽  
M. Jafelicci ◽  
Joaquim Portillo
Keyword(s):  
Yttrium Iron Garnet ◽  
Colloidal Particles ◽  
Energy Dispersive Spectrometry ◽  
Silica Shell ◽  
Photoemission Spectroscopy ◽  
Vibrating Sample Magnetometry ◽  
Yttrium Iron ◽  
X Ray ◽  
Iron Garnet ◽  
Hydrolysis Of

ABSTRACTVarious properties of particles can be altered by coating them with a layer of different chemical composition. Yttrium iron garnet (YIG) particles has been coated with silica for control of their sintering, corrosion resistance, and stabilization of magnetic properties. This silica cover was obtained by hydrolysis of tetraethylorthosilicate (TEOS) in 2-propanol. This material was characterized by transmission (TEM) electron microscopy, (XEDS) X-ray energy-dispersive spectrometry, (XPS) X-ray photoemission spectroscopy and (VSM) vibrating sample magnetometry. YIG was heterocoagulated by silica as indicated by TEM micrographies. XPS measurements indicated that only binding energy for silicon and oxygen was found on the silica shell, which confirms that the YIG was covered. The values of the saturation magnetization differ from the heterocoagulated system to well-crystallized YIG.

Analysis and lattice imaging of a transitional event on garnets

1978 ◽  
Vol 36 (1) ◽  
pp. 270-271
Author(s):  
J.Y. Laval
Keyword(s):  
Yttrium Iron Garnet ◽  
Reciprocal Lattice ◽  
Transitional Zone ◽  
Lattice Imaging ◽  
Yttrium Iron ◽  
X Ray ◽  
Ionic Process ◽  
The Matrix ◽  
High Resolution Technique ◽  
Iron Garnet

The exsolution of magnetite from a substituted Yttrium Iron Garnet, containing an iron excess may lead to a transitional event. This event is characterized hy the formation of a transitional zone at the center of which the magnetite nucleates (Fig.1). Since there is a contrast between the matrix and these zones and since selected area diffraction does not show any difference between those zones and the matrix in the reciprocal lattice, it is of interest to analyze the structure of the transitional zones.By using simultaneously different techniques in electron microscopy, (oscillating crystal method microdiffraction and X-ray microanalysis)one may resolve the ionic process corresponding to the transitional event and image this event subsequently by high resolution technique.

Preparation and Characterization of A Composite Obtained through Ti (IV) and Phosphoric Acid

2014 ◽  
Vol 775-776 ◽  
pp. 97-101
Author(s):  
Loanda Raquel Cumba ◽  
U.O. Bicalho ◽  
D.R. Carmo
Keyword(s):  
Phosphoric Acid ◽  
Titanium Isopropoxide ◽  
Deionized Water ◽  
Spherical Particles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electron Microscopies ◽  
Prepared Material ◽  
Scanning Electron

This paper describes the preparation and complementary characterization of a composite formed from the activation of titanium isopropoxide by phosphoric acid and deionized water (TiP).Techniques such as, X-ray diffraction (XRD), Raman , electronic (UV-vis) and Scanning electron microscopies (SEM) were used for characterization of this new composite formed. In the X-ray diffractogram of TIP was observed four intense peaks. A strong absorption was observed in the region 362-445 nm. The scanning electron microscopy of TiP, shows that the prepared material consists mostly of a cluster of spherical particles with diameters ranging from 2.35 to 2.60 μm.

Valence states of iron ions in nanostructured yttrium iron garnet Y3Fe5O12 studied by means of soft X-ray absorption spectroscopy

2012 ◽  
Vol 185 (12) ◽  
pp. 598-601 ◽  
Author(s):  
V.V. Mesilov ◽  
V.R. Galakhov ◽  
B.A. Gizhevskii ◽  
N.I. Lobachevskaya ◽  
M. Raekers ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Yttrium Iron Garnet ◽  
Iron Ions ◽  
Yttrium Iron ◽  
X Ray ◽  
Valence States ◽  
Iron Garnet ◽  
X Ray Absorption

Sol-Gel Derived Ferrites: Synthesis and Characterization

2011 ◽  
Vol 222 ◽  
pp. 235-238 ◽  
Author(s):  
Aurelija Gatelyte ◽  
Darius Jasaitis ◽  
Aldona Beganskiene ◽  
Aivaras Kareiva
Keyword(s):  
Transition Metal ◽  
Yttrium Iron Garnet ◽  
Sol Gel ◽  
Synthesis And Characterization ◽  
Ceramic Pigments ◽  
X Ray Diffraction ◽  
Yttrium Iron ◽  
X Ray ◽  
Cobalt Nickel ◽  
Iron Garnet

In the present work, the sinterability and formation of nanosized yttrium iron garnet (Y3Fe5O12), yttrium perovskite ferrite (YFeO3), cobalt, nickel and zinc iron spinel (CoFe2O4, NiFe2O4 and ZnFe2O4, respectively) powders by an aqueous sol-gel processes are investigated. The phase purity of synthesized nano-compounds was characterized by powder X-ray diffraction analysis (XRD). The microstructural evolution and morphological features of obtained transition metal ferrites were studied by scanning electron microscopy (SEM). The possible application of these nanosized transition metal ferrites as ceramic pigments was demonstrated.

Element selective X-ray magnetic circular and linear dichroisms in ferrimagnetic yttrium iron garnet films

2009 ◽  
Vol 321 (23) ◽  
pp. 3945-3962 ◽  
Author(s):  
A. Rogalev ◽  
J. Goulon ◽  
F. Wilhelm ◽  
Ch. Brouder ◽  
A. Yaresko ◽  
...  
Keyword(s):  
Yttrium Iron Garnet ◽  
Yttrium Iron ◽  
X Ray ◽  
Garnet Films ◽  
Iron Garnet

scholarly journals The Physical Properties of Erbium-Doped Yttrium Iron Garnet Films Prepared by Sol-Gel Method

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Ramadan Shaiboub ◽  
Noor Baa'yah Ibrahim ◽  
Mustafa Abdullah ◽  
Ftema Abdulhade
Keyword(s):  
Single Phase ◽  
Sol Gel ◽  
Vibrating Sample Magnetometer ◽  
Yttrium Iron ◽  
X Ray ◽  
Garnet Films ◽  
Erbium Doped ◽  
Gel Technique ◽  
Xrd Patterns ◽  
Iron Garnet

ErxY3-xFe5O12nanoparticle films (x=0.0, 0.6, 1.2, 2.0, and 2.5) have been synthesized by a sol-gel technique. All of the samples were annealed at 1000°C. The nanostructures were characterized by an X-ray diffractometer (XRD), the magnetic properties and the grain size were studied using a vibrating sample magnetometer (VSM), and a field emission scanning electron microscope (FE-SEM), respectively. The XRD patterns of the films show single phase structure. The sizes of the particles are in the range of 78 to 89 nm. The VSM result shows that the saturation magnetization ofErxY3-xFe5O12films decreased with the increment of Er concentration (x).

scholarly journals Synthesis of Oxide Ceramics in Detonating Atmosphere

Ceramics ◽  
2021 ◽  
Vol 4 (2) ◽  
pp. 249-256
Author(s):  
Pierre Gibot
Keyword(s):  
Spherical Particles ◽  
Synthesis Process ◽  
Detonation Synthesis ◽  
Oxide Ceramics ◽  
X Ray Diffraction ◽  
Detonation Products ◽  
X Ray ◽  
Electron Microscopies ◽  
Transmission Electron ◽  
Detonation Process

A detonation process based on 2,4,6 trinitrotoluene (TNT), used as an energetic reagent, was successfully implemented in the synthesis of a series of metal oxide ceramics. TNT offers better physicochemical and mechanical properties than the energetic compounds traditionally used in such processes, thus offering safer handling and transport conditions. The experimental procedure, which consisted to of mixing the energetic molecule with a ceramic salt, was simple to perform. The detonation products were characterized by X-ray diffraction, scanning and transmission electron microscopies, energy dispersive X-ray spectroscopy and nitrogen physisorption. The as-synthesized ceramic powders (CeO2, HfO2, Nb2O5, and In2O3) were crystalline and made of nano-sized quasi-spherical particles. This investigation provides an enhanced detonation synthesis process for elaborating ceramics. The majority of the oxide materials mentioned in this study had never previously been prepared by the detonation process.

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