BiFeO3(簡稱BFO)為一個非常有潛力的複鐵材料，在室溫下同時具有
鐵電性以及反鐵磁性，但有很多困難需要克服，例如雜相、巨大的漏電
流等。文獻指出其無法量測到較佳的電滯曲線是因為其過大的漏電流。
本實驗利用濕式化學法製作出單相的BFO 粉末，並藉由製程參數的
改變，以及發展厚膜製程，以期改善其漏電流以及鐵電行為。另外也比
較了三種不同計量比的BFO，來探討其雜相生成的機制。在不同頻率以
及電場下量測電滯曲線，可以看到有不同的結果。

BiFeO3 (BFO) is a potential material in the multiferroic materials. It exhibits ferroelectric ordering and antiferromagnetic ordering at room temperature. But there are many problems to overcome, such as second phase
and large leakage current. In the previous study by other reseachers point out that the poor hysteresis loop is due to the large leakage current.In this study, we present a simple wet chemical route for obtaining single phase BiFeO3 powders.The influence on leakage current and ferrocelectric
behavior by changing process parameter.Moreover ,we compare BFO by three different stoichiometric to discuss the formation mechenism of the second phase.We can see the different results by measuring P-E curve in different frequency and electric field.

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