Preparation and characterization of ester-derived BaFe12O19 powder
學年 90
學期 1
出版(發表)日期 2002-01-01
作品名稱 Preparation and characterization of ester-derived BaFe12O19 powder
著者 Yu, Hsuan-fu; Huang, Kao-chao
單位 淡江大學化學工程與材料工程學系
出版者 New York: Cambridge University Press
著錄名稱、卷期、頁數 Journal of materials research 17(1), pp.199-203
摘要 Ultrafine BaFe12O19 powder with crystallite sizes less than 200 nm was prepared via a citric acid precursor method. Citric acid was added into an aqueous solution, containing nitrates of Ba2+ and Fe3+ in a stoichiometric ratio to form barium ferrite, to chelate metallic ions in the solution. The pH of aqueous solutions was adjusted with NH4OH. After ethylene glycol was added into the solution and the system temperature was raised, esterification and dehydratation led to the formation of solid ester precursor. The distribution and contents of metallic ions in the ester are affected by the [citric acid]/[metallic ions] molar ratio used and the pH of starting solutions. When the ester-precursor obtained at pH = 9 with [citric acid]/[metallic ions] = 1.5 was used, crystalline BaFe12O19 appeared at temperatures as low as 923 K, and pure barium ferrite was obtained at 1073 K. According to the experimental results obtained, the reaction mechanism involved in the pyrolysis of esters is proposed and discussed.
語言 en
ISSN 2044-5326 0884-2914
期刊性質 國外
收錄於 SCI EI
通訊作者 Yu, Hsuan-fu
國別 USA
出版型式 紙本 電子版

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