本實驗目的在觀察混合氧化鋁與氧化釔粉末為原料，經固態反應直接合成釔鋁石榴石（YAG）粉末的可能性，及合成過程第一時間出現的結晶相晶粒大小與其相互間關係。實驗包含未添加與添加0.2 wt%、500 nm YAG晶種的Y2O3- Al2O3粉末系統。熱處理則包含由室溫升溫至預定溫度及直接由室溫進入預定溫度兩方式。兩組粉末系統均以噴霧造粒再進行熱處理。再以定量XRD 及XDR -Scherrer formula 量測各熱處理條件下所得試樣中的結晶相生成量及其晶徑。
實驗結果顯示以固態反應法生成YAG會有兩個路徑：YAG可經由YAM或YAP相變而來，也可直接由原料系統生成。直接由室溫進入預定溫度的試驗顯示高溫處理下，YAG可較YAM及YAP更易出現，顯示無法於低溫直接合成YAG之原因應與其生成活化能較高有關。但對兩路徑而言，YAP相很難短時間消失。添加晶種主要促使YAM及YAG相的生成及相轉換發生溫度提前發生。

In this study, the relationship between YAG crystallite size and phases synthesized by Al2O3 and Y2O3 powder was discussed. And how to synthesis YAG powder from product rapidly. The starting materials had granuleseeding YAG seed or not. The heat treatment include fast and slow treatment. Before heat treatment, two powder system had spray drying, and estimated phase formation and crystallite sizes by XRD( Scherrer formula ).
The result showed that existed two kind of route by synthesized YAG with Solid-state reaction. One was Y+Al→YAG and onther was YAM→YAP→YAG. When using fast heat treatment, YAG was the first phase in Al2O3-Y2O3 system. The result was that had high free energy barrier so that hard to synthesized YAG powders rapidly. But for two kinds of routs, YAP was hard to phase transformation. The purpose of seeding YAG seed was transformation temperature ahead of time.

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