本實驗探討低介電、可低溫共燒之CaO-Al2O3-SiO2 (CASG) 玻璃-陶瓷之結晶動力學及其機構，以及加入氧化鋁對此玻璃-陶瓷之結晶動力學及其介電性質之影響。純CASG玻璃於燒結過程當中形成pseudowollastonite (CaSiO3)、anorthite (CaAl2Si2O8) 及cristobalite (SiO2) 三種結晶相。由活化能之分析顯示結晶相之孕核受玻璃之相分離 (phase separation) 所控制。Pseudowollastonite 及cristobalite的結晶動力學皆遵循Avrami方程式之分析，並由實驗結果顯示兩者之表觀活化能 (apparent activation energy) 與鹼金屬離子在玻璃中擴散之活化能相近，此暗示擴散為速率控制步驟 (rate-controlling step)，而上述之結論再經由分析經量測而獲得的結晶成長速率進一步獲得驗證。當所添加的氧化鋁含量高於一臨界值時，除anorthite外，前述其他結晶相完全被抑制。上述結果係由於氧化鋁溶解於玻璃所致，此溶解現象使玻璃轉變為富鋁 (aluminum-rich) 之組成，且氧化鋁溶入玻璃之速率在動力學上遠較pseudowollastonite及cristobalite之形成為快。而anorthite之結晶動力學同樣依循Avrami方程式之分析，結果顯示其表觀活化能與Al-O鍵的強度相當，此暗示anorthite的形成屬於反應控制動力學 (reaction-controlled kinetics) 機構。在CASG + alumina系統中，隨著燒結時間的增加，材料的介電常數並未有顯著的變化，約為8左右；然而材料的介電損失卻出現顯著的下降，推測其原因為高介電損失相 (CASG) 的減少伴隨著低介電損失相 (anorthite) 的形成。

Effects of alumina on the devitrification kinetics and dielectric properties of a low-dielectric CaO-Al2O3-SiO2 glass powder have been investigated. Crystalline phases including pseudowollastonite, anorthite and cristobalite are formed during firing of the glass. The crystallization kinetics of crystalline phases follows the analyses of the Avrami equations. Combined with the results of reduced growth rate, the rate-controlling step appears to be alkali ion diffusion in the glass. With added alumina content greater than a critical value, the above crystalline phases are completely suppressed but anorthite is formed. This result is attributed to the dissolution of alumina into the glass which changes the composition of the glass. By using Avrami analysis, the rate-controlling mechanism changes to reaction-controlled kinetics which has an activation energy closely related to Al-O bonding. With increasing anorthite formed, the composites exhibit insignificant change in dielectric constant, but a significant decrease in dielectric loss.

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