設計新的製程來開拓新的思維，保持原材料的功能與特性外且具有超越單一材料的優異性質，傳統上使用氧化物與氧化鋁混合煆燒可以使氧化鋁呈色，但是也會使得氧化鋁本身具有多種雜相，目前國外已經有使用添加離子來使氧化鋁呈色的相關技術，故參考相關技術來設計本實驗。
本實驗以水熱法取代過去不同的製程，並且添加晶種以導入殼核的概念，以嘗試複合材料的觀念，水熱法在使用上可以控制水的酸鹼度pH值、溫度、持溫時間、壓力等等因素，並且可以添加晶種來幫助反應的發生，使用微波水熱的方式可快速達到目標溫度，並且具有更為準確的持溫時間控制。
本實驗使用水熱法來製備具有離子相的boehmite粉體，並且再添加二氧化矽粉末為核，以同系統水熱的方式使boehmite覆蓋在核上，經過煆燒出Mn(III)-α-alumina/mullite/silica之粉體產物，具有殼核結構，其中殼為具有錳離子相的α-alumina，核為silica，主要變因有溫度、持溫時間、Mn/Al 之原子比，添加的二氧化矽比例，觀察EDS與XRD可以證實錳離子存在於結構之中，經由XRD可以證實α-alumina、mullite、silica相的存在，使用Zeta potential可以證實出表面性質的不同進而確定殼核結構的存在。

Driven by trends in fashion, automotive and other consumer markets, pigments that generate special effects like angle-dependent color or decorative texture have a growing economic significance and can be found in various industrial products and end-user applications. Manganese-doped alumina (α-Al2O3) powders have important applications in the ceramic industry as pink pigments. They are industrially produced by using the traditional ceramic procedure that involves the mixing of the metal cations precursors (hydroxides, oxides or carbonates) and the calcination at high temperature of the mixture to develop the desired color and crystalline structure.
In this study, hydrothermal method was selected to synthesis pink pigment powders. Aluminum and manganese nitrate was selected as a source of Al and Mn, while silica powder was introduced into hydrothermal system as core substance. The advantage of this experiment will be, lower temperature to produce precursor boehmite phase, fine and uniform particle size of pigment powder and core-shell structure to enhance color performance. We could use some instruments for inspecting such as DTA, SEM, EDS, XRD and Zeta potential, etc.
We have found the lowest temperature that reaction could be product by DTA. Observing the structure of powder in high temperature by SEM and confirming core-shell structure is success by EDS and Zeta potential. Powders have provided with color of pink. We could enable the powders to need lower temperature to synthesize about 100℃ and use fewer nitrides to avoid danger of experiment.

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