鈷摻雜之六方晶鈦酸鋇的電性研究

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Title:	鈷摻雜之六方晶鈦酸鋇的電性研究
Authors:	余少維
Contributors:	材料科學與奈米科技研究所
Keywords:	六方晶鈦酸鋇鈷摻雜微波測量拉曼光譜
Date:	2010
Issue Date:	2011-10-27 15:10:13 (UTC+8)
Abstract:	在本論文中，我們利用固態反應法在空氣中燒結所有樣品，及合成Ba(Ti1-xCox)O3樣品(x = 0.05，0.10，0.15，0.2和0.25)，在x <0.25摻雜鈷的樣品，當燒結溫度增加時會形成六角晶結構。所有樣品透過了粉末X射線繞射分析，並且用“Rietveld精算擬合方法”作結構分析，所有摻雜鈷的六方晶化合物都具有相同的空間對稱群(P63/mmc)。當鈷離子取代鈦離子後，Ba(Ti1-xCox)O3的單位晶格體積隨著摻雜濃度增加而減少，因為Co3+離子半徑是小於的Ti4+ 離子所引起。同時a軸的長度是有點收縮; c軸長度略有延長。室溫拉曼光譜測量也發現當燒結溫度升高的時候，四方晶Ba(Ti1-xCox)O3振動模式將消失和六方晶Ba(Ti1-xCox)O3的振動模式強度增加。另外因為鈷離子的重量是輕於鈦離子，因此六方晶振動模式的頻率隨摻雜濃度增加而增加。射頻阻抗分析儀和微波特性測量的結果顯示，因為鈷離子半徑小於鈦離子的半徑，摻雜後會增加單位晶格的內部張力，所以鈷摻雜濃度增加導致QxF值會急劇下降，但K值只是些微減少。 In this thesis, we synthesize the BaTi1-xCoxO3 sample (x=0.05, 0.10, 0.15, 0.2 and 0.25) with the solid state method and all samples are sintering in air. The structures of Co-doping samples are formed hexagonal structure with x<0.25 when the sintering temperature is increasing. All sample are analyzed by powder X-ray diffraction and the “Rietveld profile-fitting method”, the all Co-dpoing compounds are the same symmetric space group (P63/mmc). During the substituting processing, the volume of unit cell of BaTi1-xCoxO3 samples are decreasing with the Co-ions increasing because the ion-radius of Co3+ is smaller the Ti4+. But the a-axis length is a bit contraction; the c-axis length is slightly extension. The room temperature Raman spectrum measurements are also showed that the tetragonal modes of BaTi1-xCoxO3 will go away and the intensity of hexagonal modes of BaTi1-xCoxO3 systems are increasing with sintering temperature increasing. The atomic weight of Co is lighter than Ti, so the hexagonal vibration modes of Co-doping samples are toward higher wave-number with Co -concentration increasing. The RF impedance analyzer and microwave property measurement are reported that the Co-ion is smaller than the Ti-ion which can increase the internal tension of the unit cell, so it generates that the Qxf value are hugely decreasing with Co-doping level increasing. But the K value is just a little to decreasing.
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