鈦酸鋇由於具有高的介電常數，因此廣為應用在積層陶瓷電容方面。為了增加材料之穩定性，降低介電變化率及提高居禮溫度為重要之研究方向。本實驗探討在不同熱處理氣氛下，鈦酸鉍添加對Ba(Ti0.99Mn0.01)O3晶體結構介電性質之影響，並探討錳離子之攙雜對鈦酸鉍添加之鈦酸鋇陶瓷居禮溫度及介電性質之影響。
由實驗結果發現，隨著鈦酸鉍添加量增加，Ba(Ti0.99Mn0.01)O3陶瓷體於空氣下燒結可觀察到第二相Bi2Ti2O7之生成，但在還原氣氛下燒結則無；在空氣下燒結，2mol%鈦酸鉍添加之Ba(Ti0.99Mn0.01)O3陶瓷體具有最高的居禮溫度，且介電變化率隨鈦酸鉍添加量增加而減少；而在還原氣氛下燒結，Ba(Ti0.99Mn0.01)O3陶瓷體具有較佳的介電穩定性，當2mol%鈦酸鉍添加時，於-55℃~150℃的溫度範圍內，其介電變化率小於20%。另一方面，相較於鈦酸鉍添加之Ba(Ti0.99Mn0.01)O3，未摻雜錳離子之純BaTiO3其居禮溫度反而隨著鈦酸鉍添加量增加而降低，此乃因對鈦酸鋇材料而言，錳離子之摻雜可抑制鈦酸鉍之擴散，導致少量的鈦酸鉍添加量時，形成core-shell結構，提高居禮溫度及介電穩定性。而隨著熱處理時間及鈦酸鉍濃度的增加，core-shell結構消失，因而降低了Ba(Ti0.99Mn0.01)O3陶瓷體之居禮溫度及介電穩定性。

BaTiO3 is widely used in multilayer ceramic capacitors because of its high permittivity. In order to increase the stability of BaTiO3, to suppress the variation of permittivity and to increase the Curie temperature (TC) are important. In the case, the effects of Bi4Ti3O12 (BIT) on microstructure and dielectric properties of BaTiO3 ceramics have been studied, and the effects of Mn on TC and dielectric properties of Bi4Ti3O12 doped BaTiO3 have been discussed.
From the results, there is a second phase (Bi2Ti2O7) observed in Ba(Ti0.99Mn0.01)O3 ceramics that were sintered under air with increasing the BIT content. But there is no second phase observed in Ba(Ti0.99Mn0.01)O3 ceramics as sintered under reduced atmosphere. The 2mol% BIT doped Ba(Ti0.99Mn0.01)O3 that were sintered under air has the highest TC and the variation of permittivity decreases with increasing the BIT content; The dielectric properties of Ba(Ti0.99Mn0.01)O3 ceramics that were sintered under reduced atmosphere are better than that were sintered under air, and the variation of Ba(Ti0.99Mn0.01)O3 ceramics is less than 20% from -55℃ to 150℃ when 2mol% BIT was added.
To compare with the Ba(Ti0.99Mn0.01)O3 system, the TC of Mn un-doped BaTiO3 decreased with increasing BIT content reversely. It could be suggested that the low diffusivity of Mn suppresses the diffusion of BIT into BaTiO3 grains and the core-shell structure has been formed. So the TC and dielectric stability of Ba(Ti0.99Mn0.01)O3 ceramics have been increased. However, after increasing the sintering time or the amount of BIT, core-shell structure collapses, and the TC and dielectric stability of Ba(Ti0.99Mn0.01)O3 ceramics have been decreased.

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