研究生: |
陳儷方 |
---|---|
論文名稱: |
鈮酸鋰晶體摻不同濃度氧化鎂之介電與導電性質研究 |
指導教授: | 陳瑞虹 |
學位類別: |
碩士 Master |
系所名稱: |
物理學系 Department of Physics |
論文出版年: | 2003 |
畢業學年度: | 91 |
語文別: | 中文 |
論文頁數: | 61 |
中文關鍵詞: | 鈮酸鋰晶體 、摻氧化鎂之鈮酸鋰晶體 、阻抗分析 |
論文種類: | 學術論文 |
相關次數: | 點閱:237 下載:1 |
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本論文是使用HP4194A阻抗分析儀,於溫度範圍150℃~700℃之間,來測量在不同頻率的交流電作用下(100 Hz ~ 40M Hz),鈮酸鋰晶體及摻氧化鎂之鈮酸鋰晶體阻抗的變化。從阻抗數據資料中,我們可以求得電導率隨溫度、頻率變化的關係,進而求得樣品的導電活躍能,以研究其導電性質;同時,我們也可以求得介電常數隨溫度、頻率變化的關係,進而求得其介電弛豫時間,以瞭解其介電性質;並由 (electric modulus)的表示法來研究樣品的弛豫現象。
我們還將樣品內在結構的反應採用某種等效電路進行模擬,以分析樣品對外加電場的反應。並且探討氧化鎂之添加對鈮酸鋰晶體的電導率與介電常數所造成之影響。
藉由本研究所獲得主要之結果如下:
(1) 沿著鈮酸鋰晶體及摻氧化鎂之鈮酸鋰晶體的c軸、a軸方向量測,發現其電導率在150℃~700℃之間都是隨著溫度的升高而漸漸增加的,而介電常數則是隨著溫度的增加而略微地減小。
(2) 鈮酸鋰晶體及摻氧化鎂之鈮酸鋰晶體在外加電場的作用下,離子較容易沿垂直於極化軸的方向(即a軸)發生位移,且沿著其a軸方向較易導電。
(3) 樣品對外加電場的反應都是會同時引起樣品內部導電離子的運動、伴隨電子之小極化子的運動(含電偶極矩的轉向),且其離子導電效應在高溫低頻區會較突顯,伴隨電子之小極化子的運動(含電偶極矩的轉向)則必須在低溫高頻區才能觀察得到(<550℃時以能帶傳導的方式在晶格中運動,>550℃時則以跳躍電導的方式)。
(4) 晶體的電導率與介電常數在氧化鎂濃度約為2.0mole%~3.0mole%及7.0mole%~8.0mole%出現轉折點。
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