Journal of the American Ceramic Society · 2002 · 61 citations · 7 references
Natural SciencesMaterials EngineeringMaterials ScienceMaterials ChemistryMaterials ProcessingThermal AnalysisAluminum OxidesCatalyst PreparationCrystalline MaterialsPowder ProcessingSolidification ProcessingThermogravimetric AnalysisDiffraction AnalysisExothermic Peak TemperatureExothermic TransitionsPowder Diffraction AnalysisSol-gel ProcessingX-ray Diffraction AnalysisYttrium Aluminum Garnet CeramicsYttrium Aluminum Garnet Hosts
Yttrium aluminum garnet (YAG, Y 3 Al 5 O 12 ) was synthesized by sol–gel processing from the stoichiometric amounts of aluminum pellets, Y(NO 3 ) 3 ·6H 2 O, and Al(NO 3 ) 3 ·9H 2 O or AlCl 3 ·6H 2 O, with suitable kinds of acid (citric acid, acetic acid, etc.) as catalysts. Polycrystalline YAG powder was obtained by drying the YAG precursor followed by calcination at temperatures above 900°C. Thermogravimetry/differential thermal analysis and Fourier transform infrared specotrscopic analyses in air showed an exothermic peak at ∼900°C, attributed to the formation of a polycrystalline YAG phase and weight loss of 60% at 1000°C, caused by the decomposition of hydroxyl and NO 3 − , etc. X‐ray diffraction analysis showed that YAG can be formed at 900°C, and no other intermediate was observed. In particular, the YAG sol can be used for dry‐spinning fibers with the aid of some organic polymer.
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