| 研究生: |
蕭旭凱 Shiau, Hsu-Kai |
|---|---|
| 論文名稱: |
鈣鈦礦結構CaCu3Ti4O12之介電及電性的研究 Dielectric and Electrical Properties of CaCu3Ti4O12 |
| 指導教授: |
方滄澤
Fang, Tsang-Tse |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 材料科學及工程學系 Department of Materials Science and Engineering |
| 論文出版年: | 2002 |
| 畢業學年度: | 90 |
| 語文別: | 中文 |
| 論文頁數: | 71 |
| 中文關鍵詞: | 鈣鈦礦結構 、高介電 、鈣銅鈦氧化合物 |
| 外文關鍵詞: | giant dielectric constant, perovskite, CaCu3Ti4O12 |
| 相關次數: | 點閱:83 下載:1 |
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CaCu3Ti4O12化合物(簡稱CCTO)為鈣鈦礦立方晶系結構。此化合物可在相當廣泛的溫度區間保持著介電持平的效應,且其介電常數是相當的高,在1000Hz室溫所量測之值可達到20000以上,且不需要特殊之製造過程,燒結溫度也不高約1000℃~1100℃上下,是一般介電材料難以達到的性質。
由於此CaCu3Ti4O12化合物為相當新的材料,我們主要先使用固態反應法,將此化合物合成單相粉末,再接續著後續的燒結以及分析的動作。嘗試著將此材料之性質研究出,以利於往後工業上之應用。
實驗結果從緻密度、SEM、TEM、電阻率、阻抗分析之方式,去瞭解此CaCu3Ti4O12化合物之介電性質來源。我們選擇以950℃作為此CaCu3Ti4O12化合物之粉末合成溫度,並分別於選擇之1035℃、1050℃、1065℃作為燒結溫度,發現CaCu3Ti4O12會隨著燒結溫度以及持溫時間的不同而有所明顯的差異,且會伴隨著異常晶粒成長等的情形發生。從這些現象看來,可發現此材料之性質跟燒結的過程有一定的關係以及由多種的機制造成。
The CaCu3Ti4O12 (CCTO)is a cubic perovskite structure. It has s a large dielectric constant which is independent of temperature. The compound can be synthesized and sintered at low temperature.
We use the solid state reactions to prepare the single phase powder of CCTO. The research mainly discusses that the effect if the sintering conditions on the microstructure, sintering, dielectric and electric properties of CCTO ceramics.
It’s found that the dielectric constant of the sample sintered with different holding time is variety. When the holding time increases the dielectric constant also increase. And the resistivity firstly decrease and then increase at 1050℃ and 1065℃. We also observe the abnormal grain growth in the CCTO. The conduction and dielectric mechanisms of CCTO are more than one. The CCTO properties are change easily with the different sintering condition.
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