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Control of YAG($Y_{3}Al_{5]O_{12}$) Particle Shape prepared by Sol-Gel Process  

Park, Jin-Tae (Division of Minerals Utilization and Materials, Korea Institute of Geoscience and Mineral Resources)
Kim, Chul-Joo (Division of Minerals Utilization and Materials, Korea Institute of Geoscience and Mineral Resources)
Yoon, Ho-Sung (Division of Minerals Utilization and Materials, Korea Institute of Geoscience and Mineral Resources)
Sohn, Jung-Soo (Division of Minerals Utilization and Materials, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Resources Recycling / v.17, no.5, 2008 , pp. 52-59 More about this Journal
Abstract
Sol-gel process applied in this study was carried out by chelation of metal ions and citric acid. From the results of thermal gravimetric analysis and XRD analysis of gel powder obtained through sol-gel and heat treatment, gel powders are mostly amorphous, and crystallize completely at $900^{\circ}C$, and the crystalline structure of YAG increases with increasing calcinations temperature. Since YAG prepared by sol-gel & calcinations process was porous, and the sape and size was irregular and nonuniform, the shape and size of YAG powder had to be controlled. Therefore the effects of organic materials such as ethylene glycol and surfactant on the crystalline structure of YAG powder were investigated. Polyesterification of ethylene glycol and citric acid separated reaction area of metal ions in the solution and decreased the size of YAG primary particles. The addition of Igepal 630 as surfactant formed the droplet in the solution, and increased the size of primary particles which forms the aggregate of YAG In order to obtain monodispersed YAG particles of uniform size, gel powder prepared with organic materials had to be milled before calcination. And milling process was very important for obtaining YAG of uniform size.
Keywords
sol-gel process; YAG; esterification; surfactant; milling;
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