| 研究生: |
李梓豪 Li, Tzu-Hao |
|---|---|
| 論文名稱: |
製程參數對Ce及Cr共添加之鍶鋇鈮陶瓷電域壁動力學及介電性質之影響 Effect of Process Parameter on Domain Wall Dynamics and Dielectric Properties of Ce and Cr Co-doped SBN50 |
| 指導教授: |
許文東
Hsu, Wen-Dung 林士剛 Lin, Shih-Kang |
| 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: | 2013 |
| 畢業學年度: | 101 |
| 語文別: | 中文 |
| 論文頁數: | 141 |
| 中文關鍵詞: | 鍶鋇鈮陶瓷 、共添加 、晶域壁動力學 、鬆弛時間 |
| 外文關鍵詞: | SBN, Co-doping, domain wall dynamics, relaxation time |
| 相關次數: | 點閱:79 下載:2 |
| 分享至: |
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鍶鋇鈮陶瓷是一種透光材料,其結構為正方鎢青銅結構(Tetragonal Tungsten Bronze, TTB, SBN),為非中心對稱的鐵電材料。其具有很高的線性光電係數、高的焦電係數以及良好的光折射效應,目前主要使用(Czoxhralski method)。儘管鍶鋇鈮單晶的成長技術及其性質已廣泛被研究,,但因價格與製造上的困難,故應用上有其限制所在如形狀、大小、機械強度等,因此開發鍶鋇鈮多晶陶瓷乃必然趨勢。
本研究將利用Cole-Cole plot探討純SBN50及共添加Cr2O3與CeO2在交流電場下的介電性質與晶域壁動力學機制,並分析在不同溫度及共添加比例下造成的影響,接著用公式擬合relaxation區段。
最後再利用擬合得到的參數觀察添加物對於SBN50的影響。
Strontium barium niobate ( SBN ) ceramic is a good electro-optic material. It has Tetragonal Tungsten Bronze (TTB) structure and SBN is a non centro-symmerty ferroelectrics. It has very high linear electro-optical coefficient、high pyroelectric coefficient and good photorefractive effect, SBN ceramic uses CZ method to growth now. Though the properties of the SBN single crystal has been intensively studied, its high cost and difficult fabrication have limited its practical use, such as shape, size or mechanical strength,hence it is necessary to develop polycrystal SBN ceramic.
We take advantage of Cole-Cole plot to study the dielectric properties and domain wall dynamics of pure SBN50 and co-doping Cr2O3,CeO2 under ac field, and analyze effects of different temperature and doping ratio, then we use function to fit the region of relaxation.
Finally, we observe the effect of co-doping in SBN50 by the fitting parameters.
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校內:2018-08-22公開