Synthesis of the Gadolinium-Yttrium-Aluminum Garnet Activated with Cerium by Spraying High Aqueous Salt Solutions

2016 ◽  
Vol 721 ◽  
pp. 267-271 ◽  
Author(s):  
Aleksei Makeenko ◽  
Tatiana Larionova ◽  
Olga Klimova ◽  
Vitalii Galkin ◽  
Roman Starykh ◽  
...  
Keyword(s):  
Single Phase ◽  
Yttrium Aluminum Garnet ◽  
Complex Oxides ◽  
Drying Method ◽  
Garnet Structure ◽  
Salt Solutions ◽  
X Ray ◽  
Wide Range ◽  
Aqueous Salt Solutions ◽  
Yttrium Aluminum

The possibility of applying the spray drying method for the production of complex oxides powders with garnet structure is shown in paper. The processes occurring while heating of synthesized oxide-salt product, that lead to the formation of a material with a garnet structure were investigated by DTA, TGA, X-ray analysis. The possibility of producing single-phase structure of the garnet system (YxGd(3-x))3Al5O12 in wide range of compositions is demonstrated.

scholarly journals Preparation of Ce-doped yttrium aluminum garnet phosphor particles using spray drying method

2020 ◽  
pp. 1-8
Author(s):  
Shao-Ju Shih ◽  
Lewi Peter Richardo ◽  
Kevin Indrawan Sucipto ◽  
Zhi-Meng Wang
Keyword(s):  
Spray Drying ◽  
Yttrium Aluminum Garnet ◽  
Drying Method ◽  
Yttrium Aluminum

Phase selection in precursor-derived yttrium aluminum garnet and related Al2O3–Y2O3 compositions

2005 ◽  
Vol 20 (4) ◽  
pp. 1017-1025 ◽  
Author(s):  
Ashutosh S. Gandhi ◽  
Carlos G. Levi
Keyword(s):  
Heat Treatment ◽  
Yttrium Aluminum Garnet ◽  
Lattice Parameter ◽  
Defect Structures ◽  
X Ray Diffraction ◽  
Phase Selection ◽  
X Ray ◽  
Yttrium Aluminum ◽  
Rich Side ◽  
Nitrate Solutions

Al2O3–Y2O3 powders were synthesized in the range of 25–55% Y2O3 by reverse coprecipitation of nitrate solutions. All starting powders were amorphous and formed primary yttrium aluminum garnet (YAG) upon crystallization. X-ray diffraction detected only garnet in compositions of 30–40% Y2O3 after heat treatment at 1250 °C. Compositions of 45–55% Y2O3 established a metastable YAG + Y4Al2O9 microstructure. The YAG phase field was metastably extended away from its stoichiometry, as indicated by a systematic increase in lattice parameter with Y2O3 content. Although some Al2O3 enrichment was achieved, YAG appears to tolerate greater off-stoichiometry on the Y2O3-rich side. Possible defect structures accommodating the solubility extension were examined. Phase selection results indicate that compositional inhomogeneity is not the only reason behind the appearance of hexagonal YAlO3, which is frequently reported during YAG synthesis.

Contribution of the hybrid component to the structure and properties of ceramics based on metastable phases Al2O3

2021 ◽  
pp. 127-136
Author(s):  
A. V. Maletsky ◽  
T. E. Konstantinova ◽  
D. R. Belichko ◽  
G. K. Volkova ◽  
V. V. Burkhovetsky
Keyword(s):  
Mechanical Properties ◽  
Yttrium Aluminum Garnet ◽  
Metastable Phase ◽  
Physical And Mechanical Properties ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
Mutual Inhibition ◽  
X Ray ◽  
Tetragonal Lattice ◽  
Yttrium Aluminum

The paper presents results of the study of the effect of doping with yttrium oxide on ceramics of the composition (γ + θ) Al2O3 + nY2O3 (n = 0, 1, 2, 3 wt%), sintered at 1550°C for 2 h, from powders of the specified composition annealed at temperatures of 500 , 800, 1000°С. X-ray diffraction analysis established the formation in ceramics of yttrium aluminum garnet Y3Al5O12 (YAG) and a metastable phase of the same composition with a tetragonal lattice type in powders at temperatures above 1200°C. The effect of YAG on the physical and mechanical properties was established: high properties were demonstrated by ceramics of the composition α-Al2O3 + 2wt% Y2O3, obtained from a powder annealed at 1000°C. In addition, high physical and mechanical properties were observed in ceramics of the composition α-Al2O3 + 0wt% Y2O3, obtained from a powder annealed at 800°C. The effect of the so-called “mutual protection against crystallization” was discovered, which consists in the mutual inhibition of crystallization processes in powders of the Al2O3 – Y2O3 system.

Investigation of the Ionic Hydration in Aqueous Salt Solutions by Soft X-ray Emission Spectroscopy

2016 ◽  
Vol 120 (31) ◽  
pp. 7687-7695 ◽  
Author(s):  
Y. L. Jeyachandran ◽  
F. Meyer ◽  
A. Benkert ◽  
M. Bär ◽  
M. Blum ◽  
...  
Keyword(s):  
Emission Spectroscopy ◽  
Salt Solutions ◽  
X Ray ◽  
Ionic Hydration ◽  
Aqueous Salt Solutions

Luminescent Materials on the Basis of Yttrium Oxide and Yttrium Aluminum Garnet Used for Photodynamic Therapy

2015 ◽  
Vol 670 ◽  
pp. 232-238 ◽  
Author(s):  
Vadim V. Bakhmetyev ◽  
Lev A. Lebedev ◽  
Anna B. Vlasenko ◽  
Sergey P. Bogdanov ◽  
Alexander E. Sovestnov ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Yttrium Aluminum Garnet ◽  
Pechini Method ◽  
Luminescent Materials ◽  
X Ray ◽  
High Temperature Synthesis ◽  
Yttrium Aluminum ◽  
Size Of Particles ◽  
High Level ◽  
Shs Method

Finely-dispersed phosphors of Y2O3:Eu and Y3Al5O12:Eu have been synthesized with the help of Pechini method and the method of self-propagating high-temperature synthesis (SHS). During the synthesis of phosphors on the basis of Y2O3 carried out with Pechini method the size of crystallites increases with the enlargement of concentration of yttrium, but it decreases when the method of SHS is applied. The structure of phosphors on the basis of Y3Al5O12 (YAG) is strongly amorphized. This fact agrees with the data of XRD and with the prevalence of the band with λmax = 613 nm in the spectra of this phosphor. The enlargement of yttrium concentration in it promotes the amorphisation of yttrium aluminum garnet and the decrease of a crystal phase content. The sample of Y3Al5O12:Eu synthesized with Pechini method has the maximum intensity, while in conditions of excitement with “high-level” X-ray radiation which corresponds to the radiation of industrial medical X-ray apparatus, the phosphor of Y2O3:Eu synthesized with the help of SHS showed the largest intensity. Colloid solutions prepared with the use of the samples synthesized by SHS method revealed a higher steadiness and a lower disposition to the sedimentation process. The samples of Y2O3:Eu phosphor possessing the smallest size of particles and the highest intensity of X-ray luminescence are the most suitable for the creation of pharmacological drugs used for photodynamic therapy.

Crystallization kinetics of yttrium aluminum garnet (Y3Al5O12)

2001 ◽  
Vol 16 (6) ◽  
pp. 1795-1805 ◽  
Author(s):  
Bradley R. Johnson ◽  
Waltraud M. Kriven
Keyword(s):  
Yttrium Aluminum Garnet ◽  
Three Dimensional ◽  
Constant Number ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Yttrium Aluminum ◽  
Temperature Transformation ◽  
Kinetics Of ◽  
Dimensional Crystal

The kinetics and pathways for crystallization of solid, amorphous, yttrium aluminum garnet (YAG) were studied using isothermal differential thermal analysis, x-ray diffraction, and transmission electron microscopy. The activation energy for crystallization was 437 KJ/mol and the measured Avrami exponent was 2.74, which corresponded to three-dimensional crystal growth with a constant number of nuclei. Time–temperature–transformation (T–T–T) curves were developed from the data to predict crystallization rates as a function of temperature. The crystallization pathway for YAG in this system is compared to others reported in the literature.

ESR and X-ray diffraction measurements of Nd substituted yttrium aluminum garnet films

2000 ◽  
Vol 300-301 ◽  
pp. 316-321 ◽  
Author(s):  
R. Jabłonski ◽  
J. Sarnecki ◽  
K. Mazur ◽  
J. Sass ◽  
J. Skwarcz
Keyword(s):  
Yttrium Aluminum Garnet ◽  
X Ray Diffraction ◽  
X Ray ◽  
Garnet Films ◽  
Yttrium Aluminum

Residual Stress Effects on Fatigue Crack Growth in Directionally Solidified YAG/Spinel Eutectics

2015 ◽  
Vol 752-753 ◽  
pp. 263-267 ◽  
Author(s):  
Serkan Abali
Keyword(s):  
Residual Stresses ◽  
Crack Growth ◽  
Yttrium Aluminum Garnet ◽  
Directionally Solidified ◽  
X Ray Diffraction ◽  
Zone Method ◽  
X Ray ◽  
Stress Effects ◽  
Float Zone ◽  
Yttrium Aluminum

In this paper, yttrium aluminum garnet-magnesium aluminate spinel with good mechanical strength was fabricated by directional solidification, and its microstructure and mechanical properties were investigated. MgAl2O4-Y3Al5O12 eutectic rods were grown by a float zone method. The composition of the grown ingots was determined by the X-ray diffraction technique and electron probe microanalysis. The crack growth characteristics were examined in directionally solidified YAG/spinel eutectics. The residual stresses were determined in MgAl2O4/Y3Al5O12 eutectics using piezospectrosocopic probes. The crack growth behaviors show that residual stresses play a key role in the crack growth.

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