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Synthesis of Bulk, Dense, Nanocrystalline Yttrium Aluminum Garnet from Amorphous Powders

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Abstract:

Amorphous powders of Al2O3—37.5 mol% Y2O3 (yttrium aluminum garnet (YAG)) were prepared by coprecipitation, decomposed at 800°C, and hot-pressed uniaxally at low temperature (600°C) and a moderate pressure (750 MPa). Optimum conditions yielded microstructures with only 2% porosity and partial crystallization of YAG. Further processing using high quasi-hydrostatic pressure (1 GPa) at 1000°C enabled the production of fully crystallized YAG with >96% relative density and a nanocrystalline grain size of ∼70 nm.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2007.01913.x

Affiliations: 1: Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India 2: Materials Science Division, National Aerospace Laboratories, Bangalore 560017, India

Publication date: November 1, 2007

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