Thermal decomposition behavior of precursors for yttrium aluminum garnet

Ramanathan, S.; Kakade, M. B.; Ravindran, P.; Kalekar, Bhupesh B.; Chetty, K. Venugopal; Tyagi, A. K.

doi:10.1007/s10973-005-7803-4

Cited by 11 publications

(8 citation statements)

References 28 publications

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“… In the furnace, the precursor droplets lost solvent water and decomposed to form amorphous yttrium hydroxide/oxide with some residual nitrate due to heating by the furnace at 500°C 30 . This was confirmed by a separate test using the same conditions for flame synthesis, except that H 2 was replaced with He at 1 SLM.…”

Section: Discussionmentioning

confidence: 74%

“…Decomposition of yttrium nitrate starts at about 300°C and ends at about 600°C, 30 which is expected to take place within the preheating furnace and the early stages of the flame. The maximum temperature in the H 2 /O 2 flame is somewhat lower that the adiabatic temperature (∼3000 K), but it should still be higher than the melting temperature of Y 2 O 3 (2410°C).…”

Section: Discussionmentioning

confidence: 99%

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Particle Size Effect on the Crystal Structure of Y₂O₃ Particles Formed in a Flame Aerosol Process

Guo

Luo

2008

Journal of the American Ceramic Society

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Y 2 O 3 is a material with wide applications. Its cubic and monoclinic polymorphs have significantly different mechanical and optical properties. The flame aerosol technique offers unique advantages in the synthesis of Y 2 O 3 particles, but it also faces the challenge of phase control for Y 2 O 3 . One possible strategy for Y 2 O 3 phase control is to utilize the particle size effect that causes the formation of the monoclinic phase at atmospheric pressure. In this study, the particle size effect on crystal structure was experimentally investigated for Y 2 O 3 particles synthesized in a high-temperature flame aerosol process. A critical particle diameter of approximately 1.5 lm was found by single-particle electron diffraction. At the critical diameter, the probability is 50% for a particle to be either cubic or monoclinic. Particles significantly smaller than the critical diameter were all monoclinic, while those significantly larger were all cubic. The critical diameter was interpreted using an analysis that involves the free energy of a particle, which includes the bulk Gibbs free energy and the surface energy.

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Section: Discussionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Particle Size Effect on the Crystal Structure of Y₂O₃ Particles Formed in a Flame Aerosol Process

Guo

Luo

2008

Journal of the American Ceramic Society

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“…The peaks at wave numbers 798, 724, 689 and 568 cm 21 are characteristic lattice modes of vibrations of crystalline YAG and therefore confirms the formation of YAG at 900uC. 20,25,[41][42][43] It appears that combustion of the foamy mass resulted in the formation of an amorphous and homogeneous mixture of yttrium and aluminium oxides, which reacts at 900uC to form the nanocrystalline YAG. Figure 4 shows surface area of the combustion product calcined at various temperatures.…”

Section: Resultsmentioning

confidence: 67%

“…These carbonates decompose to oxides at higher temperatures (.800uC). 42,43 It has also been reported that carbon dioxide in the atmosphere reacts with yttrium oxide at temperature less than 600uC to form yttrium carbonate. 44 In the present work, TGA of the foamy mass did not show considerable weight loss at temperature higher than 530uC, indicating that the carbonates are not formed during the combustion process.…”

Section: Resultsmentioning

confidence: 99%

Sucrose combustion synthesis of nanocrystalline yttrium aluminium garnet (Y₃Al₅O₁₂) powder

Pabhakaran¹,

Ojha²,

Biswas³

et al. 2009

Advances in Applied Ceramics

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Nanocrystalline yttrium aluminium garnet (YAG) powder has been synthesised by sucrose combustion method. A foamy mass obtained by drying a resin prepared by heating yttrium nitrate, aluminium nitrate and sucrose undergoes self-sustained combustion when initiated with a burning splinter and produces YAG precursors containing amorphous oxides of yttrium and aluminium. The YAG phase has been obtained from the precursors during calcination at a relatively low temperature of 900uC without the formation of any intermediate compounds. The YAG powder prepared by planetary ball milling of the combustion product calcined at 900uC contained particles in the size range of 0?06 to 5 mm with a D 50 value of 1?04 mm and had a surface area of 21?5 m 2 g 21 . The YAG particles are aggregate of crystallites of the size nearly 30 nm.

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“…This may be caused by adsorption of water during storage and sample handling in ambient conditions. The band at 2340 cm -1 was not observed for commercial ZrO 2 , but can be ascribed here to trapped CO 2 , which is evolved during the decomposition of the precursor [23]. After annealing the CA 4:1 Zr(IV) gel at 600°C a vibration is present at 2200 cm -1 , which can be ascribed to nitriles formed from ammonium citrate by dehydration to amides and subsequently to nitriles [24].…”

Section: 2mentioning

confidence: 82%

Aqueous solution–gel preparation of ultrathin ZrO2 films for gate dielectric application

et al. 2008

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Zirconia ultrathin films were deposited by aqueous chemical solution deposition, using citratoperoxo-Zr(IV) precursors with different citric acid content. The precursor synthesis, thermal decomposition and crystallization of oxide powders was studied. This showed an effect of the citric acid content in every stage. The precursors were applied for the deposition of uniform, ultrathin films (< 30 nm thickness) as well. Tetragonal ZrO 2 crystallized starting from 500°C for thin films with a thickness of 10 nm. This was independent of the citric acid content in the precursor. The topography after annealing at 600°C was also similar. However, annealing at higher temperatures led to coarser grain size. The dielectric constant was high (~21-22) and comparable to ZrO 2 deposited by atomic layer deposition.

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Thermal decomposition behavior of precursors for yttrium aluminum garnet

Cited by 11 publications

References 28 publications

Particle Size Effect on the Crystal Structure of Y₂O₃ Particles Formed in a Flame Aerosol Process

Particle Size Effect on the Crystal Structure of Y₂O₃ Particles Formed in a Flame Aerosol Process

Sucrose combustion synthesis of nanocrystalline yttrium aluminium garnet (Y₃Al₅O₁₂) powder

Aqueous solution–gel preparation of ultrathin ZrO2 films for gate dielectric application

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Thermal decomposition behavior of precursors for yttrium aluminum garnet

Cited by 11 publications

References 28 publications

Particle Size Effect on the Crystal Structure of Y2O3 Particles Formed in a Flame Aerosol Process

Particle Size Effect on the Crystal Structure of Y2O3 Particles Formed in a Flame Aerosol Process

Sucrose combustion synthesis of nanocrystalline yttrium aluminium garnet (Y3Al5O12) powder

Aqueous solution–gel preparation of ultrathin ZrO2 films for gate dielectric application

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Particle Size Effect on the Crystal Structure of Y₂O₃ Particles Formed in a Flame Aerosol Process

Particle Size Effect on the Crystal Structure of Y₂O₃ Particles Formed in a Flame Aerosol Process

Sucrose combustion synthesis of nanocrystalline yttrium aluminium garnet (Y₃Al₅O₁₂) powder