BaFe/sub 12/O/sub 19/ Powder Preparation by Pyrolyzing the Corresponding Ester Precursors

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Title:	BaFe/sub 12/O/sub 19/ Powder Preparation by Pyrolyzing the Corresponding Ester Precursors
Authors:	Yu, Husan-Fu;Huang, Kuo-Chao
Contributors:	淡江大學化學工程學系
Keywords:	前驅物法;粉體製備;酯;Precursor Method;Powder Preparation;Ester
Date:	1999-11
Issue Date:	2014-02-09 00:50:29 (UTC+8)
Abstract:	Magnetic BaFe/sub 12/O/sub 19/ with ultrafine crystallites was produced via a citric acid precursor method. Ester precursors that contained the required amount of Ba/sub 2+/ and Fe/sub 3+/ to form barium ferrites were prepared by chelating Ba/sub 2+/ and Fe/sub 3+/ with citric acid in an aqueous solution of nitrates and then reacting the solution with ethylene glycol at 353 K. The pH values of aqueous solutions were adjusted using ammonium hydroxide. The dried solid precursors were then pyrolyzed at 623, 873 and 1,073 K, respectively. The effects of pH of the starting aqueous solutions on the characteristics of the resultant powder were studied using SEM, TEM, EDM, XRD, and EDS. The experimental results showed that the powder obtained at 873 K or below was composed of .gamma.-Fe/sub 2/ O/sub 3/ and BaCO/sub 3/. At 1,073 K, submicron crystalline BaFe/sub 12/O/sub 19/ powder was obtained.
Relation:	八十八年度化工學會年會及研討會專輯─化學工程技術研討會論文集
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Proceeding

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