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- Kinetics and Mechanism of the MgO-enhanced Transformation of Hexacelsian to Celsian Barium Aluminosilicates
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題名 | Kinetics and Mechanism of the MgO-enhanced Transformation of Hexacelsian to Celsian Barium Aluminosilicates=氧化鎂加速鋇鋁矽酸鹽晶系轉換之動力學與機制 |
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作者 | 李國通; 王俊嵐; Lee, Kou-tong; Wang, Chun-lan; |
期刊 | 明志技術學院學報 |
出版日期 | 20010600 |
卷期 | 33 2001.06[民90.06] |
頁次 | 頁79-88 |
分類號 | 440.35 |
語文 | eng |
關鍵詞 | 鋇鋁矽酸鹽; 相變化; 動力學; Barium aluminosilicates; Phase transformation; Kinetics; |
中文摘要 | 使用x光繞射儀研究添入氧化鎂之六方晶系鋇鋁矽酸鹽粉末,在1225-1275℃間恆 溫轉換成單斜晶系的動力學行為。 使用 Johnson-Mehl-Avrami 方程式估算在不同溫度下的 轉換速率常數 k 值與 Avrami 指數 n。 由 Arrhenius 圖求得活化能為 110.6 kJ/mol, Avrami 指數 n 的平均值為 1.5。數據顯示氧化鎂的存在會促使碟狀的單斜晶核在六方晶系 結構中形成。因此,六方晶系結構在( 0001 )面產生相對滑移,進而提高相變化的速率。 |
英文摘要 | Pre-synthesized hexacelsian powders doped with MgO were held isothermally at different temperatures between 1225 to 1275 ℃ to study the kinetics of the hexacelsian-to-celsian transformation in barium aluminosilicate, using x-ray diffraction. Semi-quantitative analysis was used to determine the extent of the transformation. Values of rate constant (k) and Avrami exponent (n) for the transformation at various temperatures were evaluated using the Johnson-Mehl-Avrami equation. The activation energy for the transformation was evaluated from an Arrhenius plot being 110.6 kJ/mol and the average Avrami exponent n is 1.5, suggesting that the presence of mineralizers like MgO could promote the formation of celsian nuclei with a plate-like shape on the basal planes of the hexacelsian structure. The basal-plane glide is a rate-determining step in the transformation of hexacelsian to celsian and can be enhanced by the addition of mineralizers. |
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