Compositions: ceramic – Ceramic compositions – Refractory
Reexamination Certificate
2005-04-22
2009-10-06
Vanoy, Timothy C (Department: 1793)
Compositions: ceramic
Ceramic compositions
Refractory
C501S098200, C423S021100, C423S111000, C423S115000, C423S155000, C423S179000, C423S326000, C423S327100, C423S331000, C423S332000, C423S593100, C423S594150, C423S594160, C423S600000
Reexamination Certificate
active
07598194
ABSTRACT:
It is aimed at providing an oxynitride powder, which is suitable for usage as a phosphor, is free from coloration due to contamination of impurities, and mainly includes a fine α-sialon powder.An oxynitride powder is produced by applying a heat treatment in a reducing and nitriding atmosphere, to a precursor compound including at least constituent elements M, Si, Al, and O (where M is one element or mixed two or more elements selected from Li, Mg, Ca, Sr, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), thereby decreasing an oxygen content and increasing a nitrogen content of the precursor.
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J.W.H. van Krevel et al. Luminescence Properties of Terbium-, Cerium-, or Europium-Doped alpha-Sialon Materials, 2002, Journal of Solid State Chemistry, vol. 165, No. 1, p. 19-24.
Hirosaki Naoto
Suehiro Takayuki
Hanor Serena L
Kanesaka Manabu
National Institute for Materials Science
Vanoy Timothy C
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