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Optically Transparent Polycrystalline Al2O3 Produced by Spark Plasma Sintering

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The spark plasma sintering (SPS) technique was used to produce mid-infrared (IR) transparent alumina with the desired transmittance. An excellent transmittance of 85% has been obtained in a sample sintered at 1300°C for 5 min. The heating rate, sintering time, and annealing have a significant influence on IR transmittance. The improvement in transmission may be attributed to the progressive elimination of residual porosity when applying a slower heating rate, longer sintering time during SPS, and postsinter annealing. It is suggested that localized residual strain/stress at grain boundaries and oxygen vacancy concentration are other factors influencing the optical properties of the SPS-sintered alumina.
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Document Type: Research Article

Affiliations: 1: Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616 2: Department of Chemistry, University of California, Davis, California 95616

Publication date: January 1, 2008

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