Development of SiAlON - From Mechanical to Optical Applications

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Various rare-earth-doped α-SiAlON powders with high purity were prepared to study mechanical and optical properties of SiAlON-based functional materials in connection with ionic radius and electronic structure of rare-earth elements. Single phase rare-earth-doped α-SiAlON powders were obtained at a temperature as low as 1873 K by heating powder mixtures of rare-earth oxide, AlN and highly active ultrafine amorphous Si3N4. Bending strength of highly dense rare-earth-doped α/β-SiAlON-based ceramics was increased with decreasing radii of rare-earth ions, i.e., Yb-SiAlON-based ceramics exhibited excellent high-temperature strength and oxidation resistance caused by the small ionic radius of ytterbium. As for optical application, α-SiAlON is an excellent host lattice with good thermal and chemical stability for doping rare-earth element which activates photoluminescence. Europium-doped Ca-α-SiAlON phosphor formulated as CaxEuy(Si,Al)12(O,N)16 (where 0

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Periodical:

Edited by:

Katsutoshi Komeya, Yohtaro Matsuo and Takashi Goto

Pages:

173-178

DOI:

10.4028/www.scientific.net/KEM.352.173

Citation:

T. Yamada et al., "Development of SiAlON - From Mechanical to Optical Applications", Key Engineering Materials, Vol. 352, pp. 173-178, 2007

Online since:

August 2007

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$35.00

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