在 Y2O3-Al2O3 二相系統中，YAG 生成之擴散機制主要為 Al 擴散進入 Y2O3 中，故合成 YAG 之晶粒大小與起始粉末中 Y2O3 的粒徑大小有著很大的關聯性。本研究利用固態反應法製備 YAG 粉體，並以起始原料的球磨參數與熱處理條件作為製程之變數，探討起始原料之大小對於製備 YAG 粉體特性之影響。
　　研究結果顯示，利用控制球磨的漿料固含量與球磨轉速可獲得小粒徑且具高均一性的 Y2O3 (YB)，並進一步以熱處理獲得不同粒徑且高均一性的Y2O3 (Y14、Y15)。後續以 YB 合成 YAG，於 1400℃ 煅燒即可合成純相 YAG，但以1600℃ 煅燒合成微米級 YAG 則會有蠕蟲狀或嚴重燒結現象，需要以研磨和再分級加以處理，但對於粉體之晶型會有嚴重影響，對於應用上較為不利；此外，以 Y14 與 Y15 作為起始粉末，隨著起始粉末越大，合成純相 YAG 所需的溫度也隨之提高，且在同樣煅燒條件下所合成的 YAG 粉末也隨之越大，但所合成之 YAG 較無團聚產生，故不需以煆燒後球磨的方式處理，較能保持合成微米級 YAG 的晶型與結晶度。因此，本研究認為欲以固態反應法合成微米級之 YAG 粉體，所選用的 Y2O3 起始粉末應以 500 nm 以上之單晶粉體較佳。

　　In the Y2O3-Al2O3 system, Al3+ diffuses into the Y2O3 structure in the reaction process of YAG synthesis by solid state reaction, therefore grain size of synthesizes of the YAG powder has the big relatedness with the Y2O3 particle size. This study using the solid state reaction to synthesis the YAG powder, and takes variable of the starting material's ball milling parameter and the heat treatment condition to discuss the size of the starting powder regarding prepares influence of the YAG powder characteristic.
　　The results showed that the use controls ball milling's solid content and the rotational speed may obtain the small size particle with high homogeneity Y2O3 (YB), and obtains the different particle size with high homogeneity Y2O3 (Y14, Y15) by the heat treatment. Following synthesizes YAG by YB, we can obtain pure YAG after calcining in 1400℃, but will have the serious vermicular growth by calcining in 1600℃ to synthesis micron size YAG. Grind and to grade again processes is helpful to obtain the YAG particle, but will have the serious influence of crystallinity of regarding the powder. In addition, takes the powder by Y14 and Y15, as bigger as the Y2O3 starting powder, the temperature of synthesizing pure YAG needs also along with it enhancement. Synthesizes with the same calcine condition the YAG powder is also bigger along with it, but synthesis of YAG does not have the serious agglomeration, therefore it’s unnecessary to use re-treatment processing, can maintain the particle shape and crystallinity of YAG. Therefore, this study demonstrated that synthesizes micron size YAG powder by the solid state reaction, it’s better to select the single crystal Y2O3 with size 500 nm above as starting powder.

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