Thermochemical behavior of metallic citrate precursors for the production of pure LaAlO3
學年 97
學期 1
出版（發表）日期 2009-01-01
作品名稱 Thermochemical behavior of metallic citrate precursors for the production of pure LaAlO3
作品名稱（其他語言）
著者 余宣賦; Yu, Hsuan-fu; Wang, Juy; Wang, Shuen-shian; Kuo, Yu-man
單位 淡江大學化學工程與材料工程學系
出版者 Kidlington: Pergamon
著錄名稱、卷期、頁數 Journal of Physics and Chemistry of Solids 70(1), pp.218-223
摘要 Pure LaAlO3 nanoparticles were synthesized, using a citrate-precursor technique. La(NO3)3, Al(NO3)3, and C3H4(OH)(COOH)3, in a molar ratio of 1:1:4.5, were dissolved in deionized water. The pH of the aqueous solution was adjusted using NH4OH. After drying, the citrate precursors were charred at 350 °C, followed by calcination at different temperatures. The thermochemical behavior of the charred citrate precursor to form LaAlO3 was investigated using X-ray diffractometry, infrared spectroscopy, thermogravimetric analysis, and differential thermal analysis. While the charred specimen obtained at pH=2 (without NH4OH addition) was composed of LaAl(OOCH2)3, the charred specimens obtained at pH>2 were composed of LaAlO3−x−y(CO3)x(OH)2y. All these metallic salts were decomposed at temperatures between 600 and 780 °C to form crystalline LaAlO3 but calcining the specimens in air at 800 °C were required to remove all residual chars to produce pure LaAlO3. At 900 °C, the citrate-derived particles obtained at pH>2 were composed of LaAlO3 crystallites with an average size of 30 nm.
關鍵字 A. Ceramics; B. Chemical synthesis; C. Infrared spectroscopy; C. X-ray diffraction; D. Phase transitions
語言 en
ISSN 0022-3697
期刊性質 國外
收錄於 SCI EI
產學合作
通訊作者
審稿制度
國別 GBR
公開徵稿
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