PREPARATION OF UNARY AND MULTICOMPONENT OXIDES BY IGNITION REACTION

PURPOSE: Provided is a simple preparation method of unary and multicomponent oxide powders which have nano size, high purity, a homogeneous composition in metal doping and low sintering temperature by ignition reaction. CONSTITUTION: The preparation method of unary(MaOx), binary(MaMbOx), ternary(MaM...

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Bibliographic Details
Main Authors YANG, YEONG SEOK, PAK, CHONG SIK
Format Patent
LanguageEnglish
Korean
Published 19.10.2002
Edition7
Subjects
CHEMISTRY
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F
INORGANIC CHEMISTRY
METALLURGY
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Summary:PURPOSE: Provided is a simple preparation method of unary and multicomponent oxide powders which have nano size, high purity, a homogeneous composition in metal doping and low sintering temperature by ignition reaction. CONSTITUTION: The preparation method of unary(MaOx), binary(MaMbOx), ternary(MaMbMcOx), and multicomponent(MaMb...MnOx) powders, where M is metal, O is oxygen, and a, b, c, n and x are stoichiometric ratios of oxides, is as follow: (i) dissolving stoichiometric amount of raw materials, metallic salts such as oxides, nitrates, carbonates and hydroxides of metals(M) such as Mg, Al, Si, Ca, Ti, Cr, etc., into 0.1-5M HNO3; (ii) adding an organic acid such as malic acid, maleic acid, citric acid or critic acid to get precursors; (iii) adding NH4OH to adjust the pH of the solution between 3-9; (iv) ignition reacting the solution at 200-500deg.C for precursor powders; (v) calcining and sintering.
Bibliography:Application Number: KR20010018425