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Highly Transparent Lu-α-SiAlON

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Novel Lu-α-SiAlON ceramics were produced by hot pressing mixtures of Si3N4, Lu2O3, AlN, and Al2O3 at 1950°C for 2 h in a nitrogen atmosphere. The resultant SiAlON was fully dense and possessed a uniform, equiaxed microstructure with a grain size of ∼1 μm, which resulted in a high hardness of >19 GPa. In addition to high hardness, the sample showed very high optical transparency in the visible light region, with >70% transmission at higher wavelengths. This high transparency was attributed to the uniform, dense microstructure and lack of residual grain-boundary phase.
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Keywords: SiAlON; optical materials/properties; rare earths

Document Type: Research Article

Affiliations: 1: Synergy Materials Research Center, AIST, Nagoya 463-8687, Japan 2: Fine Ceramics Research Association, Nagoya 463-8687, Japan

Publication date: April 1, 2004

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