Crystallization kinetics and densification of YAG nanoparticles from various chelating agents

Journal Article · Wed Aug 05 00:00:00 EDT 2009 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2009.03.001· OSTI ID:22029839

Hou, J G ^[1]; Qu, Y F ^[2]; Krsmanovic, Dalibor ^[1]

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1. Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ (United Kingdom)
2. Key Laboratory for Advanced Ceramic and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072 (China)

Yttrium aluminium garnet (YAG, Y{sub 3}Al{sub 5}O{sub 12}) nanoparticles were prepared using sonochemical sol-gel method with three different chelating agents and the effect of crystallization kinetics was investigated with differential scanning calorimetry-thermogravimetry (DSC-TG). The activation energy values of crystallization for the as-synthesized YAG nanoparticles using citric acid (CA), glycine (G) or a mixture of citric acid-glycine (CA-G), as chelating agents were found to be 160.5, 142.2 and 140.4 kJ mol{sup -1} and the corresponding Avarami constants were 2.2, 2.1 and 1.9, respectively. Samples produced with the mixed chelating agent under sonification, could be crystallized to single phase YAG nanoparticles (10-65 nm) after annealing at 1100 deg. C. Pellets made from the annealed YAG particles could be sintered to a relative density greater than 99% at 1500 deg. C with a grain size of 4.5 {mu}m, made up of secondary particles formed from primary nano-crystals within the grains. Grain size and relative density increased with different chelating agents from CA to G and CA-G in the increasing order when YAG samples were sintered. Grain growth and densification occurred at a relatively low temperature of 1500 deg. C as compared to over 1800 deg. C in solid-state reactions.

• OSTI ID: 22029839
• Journal Information: Materials Research Bulletin, Vol. 44, Issue 8; Other Information: Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
ANNEALING
CALORIMETRY
CHELATING AGENTS
CITRIC ACID
CRYSTALLIZATION
CRYSTALS
DENSITY
FERRITE GARNETS
GLYCINE
GRAIN GROWTH
GRAIN SIZE
INORGANIC COMPOUNDS
NANOSTRUCTURES
NEODYMIUM LASERS
SOL-GEL PROCESS
SOLIDS
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS