Oxynitride powder and production method thereof
AssigneeNational Institute for Materials Science
InventorsNaoto Hirosaki, Takayuki Suehiro
Life of this patent
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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.
Claims17
A production method of an oxynitride powder, comprising the step of:
- 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,
- wherein the precursor compound is a mixture of:
- a compound SiX which turns into silicon dioxide, silicon oxynitride, or silicon nitride, by heating;
- a compound MX which turns into oxide, oxynitride, or nitride of M by heating;
- and a compound AlX which turns into aluminum oxide, aluminum oxynitride, or aluminum nitride, by heating, and
- wherein the precursor compound is a compound obtained by applying a heat treatment to a complex citrate to thereby decompose and eliminate citric acid therefrom, the complex citrate being obtained by dispersing the SiX in an aqueous solution including the MX and AlX dissolved therein, followed by addition of citric acid and by drying and dehydration.
A production method of an oxynitride powder, comprising the step of:
- 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,
- wherein the precursor compound is a mixture of:
- a compound SiX which turns into silicon dioxide, silicon oxynitride, or silicon nitride, by heating;
- a compound MX which turns into oxide, oxynitride, or nitride of M by heating;
- and a compound AlX which turns into aluminum oxide, aluminum oxynitride, or aluminum nitride, by heating, and
- wherein MX particles and AlX particles have averaged particle sizes smaller than that of SiX particles, respectively.
A production method of an oxynitride powder, comprising the step of:
- 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,
- wherein the precursor compound is a mixture of:
- a compound SiX which turns into silicon dioxide, silicon oxynitride, or silicon nitride, by heating;
- a compound MX which turns into oxide, oxynitride, or nitride of M by heating;
- and a compound AlX which turns into aluminum oxide, aluminum oxynitride, or aluminum nitride, by heating, and
- wherein the precursor compound is a complex citrate obtained by dispersing the SiX in an aqueous solution including the MX and AlX dissolved therein, followed by addition of citric acid and by drying and dehydration.
Dependencies are inferred from the claim text.