本論文目的為製備高磁電轉換效率的多鐵性BiFeO3-BaTiO3-CoFe2O4磁電複合塊材，以粉體固相合成法分別合成BFO和BTO的固溶體和CFO的單相，再以隨機均勻混合的方式(0-3type)燒結成塊材，再調整兩相之間的莫耳比例，找出最好的磁電耦合係數。
本實驗會遇到的問題為:(1)BFO-BTO的固溶體在熱處理的狀況下，因為鉍會揮發，導致計量比偏移，進而產生雜項，例如Bi2FeO9、Bi25FeO29。(2)CFO和BFO-BTO固溶體燒結後，其界面不能產生化學反應且塊材的密度要夠高夠緻密。實驗燒結的升溫速度為5oC/min上升到600oC後持溫一小時將黏著劑(PVB)燒掉，再升到1000oC持溫2小時來製備所有試片。從XRD的掃描圖中，可以觀察到BFO-BTO、CFO與BFO-BTO-CFO複合材料均為純相，並無明顯的雜項產生。由SEM可以觀察到磁電複合材料的致密性表現優良，從TEM的界面分析中，可以看到明顯的輪廓且沒有相互擴散及化學反應的產生，從EDS分析中觀察BFO-BTO、CFO、BFO-BTO-CFO磁電複合材料的計量比沒有顯著的偏移，符合化學計量比，隨著CFO的莫耳比增加，可以觀察到複合材料的漏電流也隨之增加，推測主要是CFO中的Co和Fe有變價的產生使得電子間有流動。
以阻抗分析儀測量界電係數與介電損耗可得知，由於BFO-BTO-CFO在磁電複合材料中為異質結構，在低頻率的狀況下(104Hz)，因為空間電位極化，介電常數較高。隨著頻率的增加，因為介電質分散(disppersion)，介電係數與介電損耗也隨之降低。由於本實驗的複合材料連接方式為隨機均勻混合鑲嵌模式複合(0-3type)，連接性複雜，因此介電常數的高低並無法以兩相複合材料的莫耳比例來預測。
在施加AC磁場頻率為1.5kHz和施加外加DC磁場2.5kOe~4kOe時，試片在此會產生諧振，會有明顯的峰值產生，BFO-BTO與CFO莫耳比為7比3的磁電複合材料在3.31kOe的外加DC磁場偏壓下有最大值，磁電係數為81.8mV/cm*Oe。實驗中也發現試片的厚度也會影響到磁電係數的高低，隨著試片的厚度愈薄，得到的磁電係數也越高，推測是試片之間傳導以及缺陷的問題，試片愈薄缺陷出現的機率也越低，愈薄所需要傳導的距離也較短，愈能將受到外加磁場的形變產生的力傳導到壓電相中已產生電流。
隨著環保的意識提高，儘管含有鋯鈦酸鉛(PZT)的0-3type連接方式的磁電複合材料擁有非常大的磁電係數，本實驗使用無鉛的壓電材料在室溫下具有多鐵性的BFO-BTO系統，其具有高的居禮溫度、壓電係數。0-3type連接方式的磁電複合材料需要克服:(1)材料的密度要高(2)兩相界面是否有相互擴散化學反應的產生 (3)兩相須維持純相無雜相的產生(4)BFO-BTO的組員Bi容易揮發造成計量比的偏移，本實驗成功使用固相合成法並控制升溫速度、燒結時間、多配比Bi的含量來克服以上問題，得到最高的磁電偶合係數為81.8mV/cm*Oe。

Magnetoelectric composites of CoFe2O4+ZnO and BiFeO3-BaTiO3+MnO2 were synthesized by solid-state sintering method. The composition and microstructure of obtained samples were examined by X-ray diffraction,scanning electron microscopy and Transmission electron microscope. The results showed a uniform mixture of both components in the composites without presence of any secondary phase. Dielectric constant and loss of the samples were studied by the impedance analysis. The piezoelectricity of the samples was confirmed by the measurement of d33 coefficient. Magnetoelectric (ME) voltage coefficient was investigated by a home-made unit,which allowed simultaneously application of both an AC (50kHz~100kHz) magnetic field of about 5Oe and a DC bias field up to 7000Oe. The highest ME coefficient was increased to 81.8mV/cm*Oe measured at the AC frequency of 1.5kHz with the DC bias of 3.31kOe,which was achieved with the 70-30 mole% BFO+BTO-CFO samples.

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