教師資料查詢 | 類別: 期刊論文 | 教師: 余宣賦 Yu, Hsuan-fu (瀏覽個人網頁)

標題: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
作品名稱(其他語言)
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.
關鍵字
語言英文
ISSN2044-5326;0884-2914
期刊性質國外
收錄於SCI;EI
產學合作
通訊作者Yu, Hsuan-fu
審稿制度
國別美國
公開徵稿
出版型式紙本;電子版
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