本研究主要討論氧化鈥（Ho2O3）對鈦酸鋇電性以及介電的影響。共分成兩部分：第一部分主要添加微量x％的氧化鈥（x=0.05, 0.1, 0.2,0.3, 0.4,0.6,0.8,1.0）於鈦酸鋇中，探討在空氣與氧氣兩種不同氧分壓的氣氛下，室溫的電阻值變化以及利用SEM觀察其微結構，得到晶粒大小變化與氧化鈥添加量及電阻變化的關係。可以發現隨著添加量的增加，電阻的變化可以分成兩個階段。在第一個階段中（x＜0.2），電阻隨著添加量的增加而降低，直到x=0.2時為最低。而第二個階段中（x＞0.2），電阻隨著添加量的增加而增加，因此，可以得到一個在x=0.2時的轉折點。
在本研究的第二個部分中，主要探討在不同氣氛下燒結的結構與電性性質之變化。以鈦酸鋇粉末為主，均添加1% Ho2O3與y %BaCO3（y=0, 0.5, 1, 1.5, 2）。並分別在空氣中與還原氣氛（5%H2-95%N2）下燒結。從電阻的變化，可以得知隨著添加Ba2+離子的增加去改變鈦酸鋇的Ba/Ti 比，影響H03+離子所佔據的位置，使得H03+離子從起初
的Ba位置上，開始部份轉移佔據到Ti位置上，其電性也從半導化變成絕緣。並以X光繞射分析來觀察其結構，由原來的正方晶（tetragonal）轉變為立方晶（cubic）以及晶格常數的變化；其介電常數也隨著Ba2+離子添加量的增加而降低，居禮溫度（Tc）也隨之往低溫偏移。

The research work on barium titanate mainly discussed the effect of doped with Ho2O3 on its electricity and dielectric. It will be divided into
two parts: first, probing into the change of resistance at room temperature, the SEM analysis, grain size, and the amount of dopant by doping with a trace of x% Ho2O3 （x=0.05, 0.1, 0.2, 0.3, 0.4,0.6,0.8,1.0）fired under different oxygen partial pressures. From increasing of dopant the
variation of resistance can be separated into two steps. The resistance decreased with adding the dopant until x=0.2 in the first step(x<0.2). On
the other hand, it increased when x>0.2 for the second step. There is a turning point on x=0.2 hence. Second, structural changes and electricity
of barium titanate（BT）ceramics doped with 1﹪Ho2O3 and y﹪BaCO3（y=0, 0.5, 1, 1.5, 2）are discussed in this investigation. Sintering of BT
is proceeded both in air and reducing atmosphere. Variations in resistance indicates that, with the increasing the amount of Ba2+ ions, Ho3+ ions are
removed from A sites and then occupy the B sites, which result in a switch from semiconducting into insulating behavior. And the original tetragonal structure transforms into cubic structure, which in turn lowers the dielectric constant.

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