本實驗利用直接混合法，將鈦酸鋇粉末與聚亞醯胺混和並形成複合電容器，探討不同鈦酸鋇粉末處理過後對整體介電特性的影響。在此分為四個部分做探討，分別為：

1.透過比較不同的原始鈦酸鋇粉體(Alfa-BT與SS-BT)粉體與聚亞醯胺進行不同體積比的混摻，添加50vol%的SS-BT有最高的介電常數值為51，其介電損失約為0.02附近。

2.原始粉體經高溫燒結後與聚亞醯胺混摻形成複合電容時，結果發現，於Alfa-BT系統中，隨著溫度的升高對結晶性有明顯的幫助，導致複合電容的介電常數上升，以50vol%為例，Alfa-BT/聚亞醯胺複合電容的介電常數約為16而Alfa-BT-1200/聚亞醯胺複合電容器的介電常數為35；於SS-BT系統中，1200℃燒結後由於晶粒成長顯著，造成介電常數上升，以50vol%為例，SS-BT/聚亞醯胺複合電容的介電常數約為51而SS-BT-1200/聚亞醯胺複合電容器的介電常數為55。

3. 於晶粒細化對介電性質之影響，將原始粉末SS-BT與1200℃燒結後SS-BT-1200之粉末分別進行高速行星球磨3小時與6小時之實驗。實驗結果發現SS-BT粒徑由300 nm減為260 nm再減為130 nm；而SS-BT-1200則從356 nm減為243 nm再減為134 nm。經過行星球磨後表面產生OH官能基，利用此官能基使粉體產生靜電斥力，減少團聚產生。但介電特性隨著球磨時間的增加而有觀察到下降的趨勢，以50vol%為例，SS-BT複合電容之介電常數經過行星球磨後，其值從51降至27；而SS-BT-1200複合電容之介電常數則從55降至 26。

4. 於粉體表面化學改值對介電性質之影響，本實驗將Alfa-BT與SS-BT以雙氧水氫氧基化再以GPTMS表面接枝改質探討對介電性質之影響。實驗結果發現，經改質後粉體所製成的複合電容，其分散性有明顯的改善但其介電常數下降的趨勢，主要因為經表面改質的粉體聚有較佳的分散性。

關鍵字：鈦酸鋇、聚亞醯胺

In this work, dielectric properties of BaTiO3/polyimide hybrid capacitors prepared with two kinds of BaTiO3 powders undergoing different modifications were investigated. The results can be summarited as the following four parts.
1. The hybrid capacitors with the BaTiO3 powders from Alfa (AlFa-BT) and from our self-synthesized ones (SS-BT) were studied at different BaTiO3 volume ratios. The 50%SS-BT/polyimide capacitors had the highest dielectric constant of 51 and a loss-tangent value of 0.02.
2. The dielectric properties of BaTiO3/polyimide capacitors were investigated for ceramic powders undergoing different sintering treatments. For the Alfa-BT capacitors, the crystallinity of BaTiO3 powder was improved. The dielectric constant of hybrid capacitors with 1200oC-treated powders was 35 but it was 16 for those with the as-received powders. For the SS-BT capacitors, the BaTiO3 powders had good crystallinity after it was sintered at 1200oC. The dielectric constant of hybrid capacitors with 1200oC-treated powders was 55 and it reached 51 for those with the as-fabricated powders.
3. To investigate the effect of ceramic particle size on the dielectric properties, the SS-BT and the 1200oC-treated BaTiO3 powders were underwent the high-speed planetary ball milling. The results displayed a refinement in particle size. The SS-BT powders with a particle size of 300 nm reduced to 260 nm and 130 nm after they were ball milled for 3h and 6h, respectively. The 1200oC-treated SS-BT powders with a particle size of 356 nm reduced to 243 nm and 134 nm after they were ball milled for 3h and 6h, respectively. The generated hydroxyl group on the milled powders provided the good dispersion for the fine powders. The dielectric constant of 51 for the 50% SS-BT/polyimide capacitors decreased to 27 after the planetary ball milling. It changed from 55 to 26 for the 1200oC-treated BaTiO3/polyimide capacitors.
4. To investigate the effect of surface modification of ceramic powder on the capacitor dielectric properties, the surfaces of Alfa-BT and SS-BT powders were firstly functionalized with hydroxyl group followed by chemically bonding with 3-glycidoxypropyltrimethoxysilane (GPTMS). The dispersion of BaTiO3 in polyimide was greatly improved, but the dielectric constants of capacitors apparently reduced. The 30% Alfa-BT/polyimide capacitors reduced its dielectric constant from 16 to 14 after the surface modification by silane. It changed from 27 to 14 for the SS-BT/polyimide capacitors.

Key word：Barium titanate、Polyimide
 

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