| 研究生: |
蘇文璋 Su, Wen-Chang |
|---|---|
| 論文名稱: |
MnO摻雜對於(1-x)Pb(Fe2/3W1/3)O3-xPbTiO3弛緩性鐵電陶瓷特性之影響及其應用 The MnO doping effects on the Characteristics and Applications of (1-x)Pb(Fe2/3W1/3)O3-PbTiO3 Relaxor Ferroelectric Ceramics |
| 指導教授: |
朱聖緣
Chu, Sheng-Yuan |
| 學位類別: |
碩士 Master |
| 系所名稱: |
電機資訊學院 - 電機工程學系 Department of Electrical Engineering |
| 論文出版年: | 2006 |
| 畢業學年度: | 94 |
| 語文別: | 中文 |
| 論文頁數: | 79 |
| 中文關鍵詞: | 鉛鐵鎢 、弛緩性鐵電陶瓷 |
| 外文關鍵詞: | pfw, relaxor |
| 相關次數: | 點閱:46 下載:2 |
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Pb(Fe2/3W1/3)O3(PFW)為弛緩性鐵電陶瓷成員之一,相變溫度為-90oC,與PbTiO3(PT)(相變溫度為490oC)形成不同比例的(1-x)PFW-xPT固溶體,相變溫度會隨x比例增加而往較高溫度移動,進而調整PT比例便可得到適當的相變溫度點。
本文以固態反應法製備(1-x)PFW-xPT弛緩體,摻雜MnO可降低介電損失並增加介電擴散現象。摻雜MnO的(1-x)PFW-xPT雖可平化介電常數溫度曲線,然效果有限,若以0.8PFW-0.2PT-0.15w%MnO及0.7PFW-0.3PT-0.15w%MnO疊壓形成二層異相介質結構,利用溫度補償的效果可進一步改善介電常數的溫度特性。
由實驗結果顯示,摻雜0.15wt%MnO可得到極低的介電損失。0.8PFW-0.2PT-0.15w%MnO及0.7PFW-0.3PT-0.15w%MnO粉體以重量比為2比1的方式疊壓形成二層結構的試片,可在-10oC~40oC溫度區間,得到平緩且不受溫度影響的介電常數溫度特性。
Pb(Fe2/3W1/3)O3(PFW) is one of the classic relaxors, with the phase transition temperature of -90℃. Since the phase transition temperature of the PbTiO3-PT is 490℃, the phase transition temperature can be adjusted to higher temperature in need by increasing the x ratio for the (1-x)PFW-xPT solid solution.
In present work, the (1-x)PFW-xPT relaxor system is synthesized with the conventional solid solution. The dielectric loss decreases and the dielectric diffusion property increases as doping the dopant MnO for the (1-x)PFW-xPT. Although, the broader peak dielectric constant is obtained as doping MnO, the improvement is not sufficient for the application of capacitor. A great improvement on the temperature dependence of the dielectric constant has been done by using the temperature-compensation method, where the two-layer-structure capacitor is stacked with two heterogeneous dielectric materials of 0.8PFW-0.2PT-0.15w%MnO and 0.7PFW-0.3PT-0.15w%MnO ceramics.
According to the experimental results, the very lower dielectric loss is observed as doping 0.15w% MnO. The smoothest dielectric constant in the temperature range between -10℃ and 40℃ has been accomplished for the two-layer-structure capacitor with the weight ratio of 2:1 the0.8PFW-0.2PT-0.15w%MnO and the 0.7PFW-0.3PT-0.15w%MnO.
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