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題 名 | 鈦酸鉛單晶鐵電電域結構之研究=Ferroelectric Domain Structure of Lead Titanate Single Crystals |
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作 者 | 陳正劭; 周振嘉; | 書刊名 | 陶業學刊 |
卷 期 | 1:1 1997.01[民86.01] |
頁 次 | 頁25-31 |
分類號 | 440.34 |
關鍵詞 | 鈦酸鉛; 鐵電材料; 電域結構; 相變化; Variants; |
語 文 | 中文(Chinese) |
中文摘要 | 本文主要係利用光學顯微鏡(OM)及掃描式(SEM)、穿透式(TEM)與高解析(HREM)等 電子顯微鏡觀察研究鐵電 (ferroelectric) 材料鈦酸鉛 (PbTiO �� ) 單晶的電域結構 (domain structure) 之特性。 結果顯示:經鐵電相變化之鈦酸鉛晶體呈現明顯的表面浮凸 (surface relief) 現象,且其內部除了一般 90 °與 180 °之電域結構外,還具有異於一 般 90 °電域結構 (twins) 的 variants 結構。 同時在 variants 相交區域的高能態電域 結構中, 則觀察到 90 °電域結構內還含有更微細之次結構 (substructural) 電域 (twinned twins) 。 此外, 在我們所觀察的鈦酸鉛晶體內其電域結構之排列形態 (configuration), 90 °電域較 180 °電域之數量佔絕對的優勢,這說明了鈦酸鉛的鐵電 相變化過程主要為其應變能所主控。此點亦經由量測其電阻率對溫度變化之關係加以證實。 因此從相變化的觀點解釋,這些電域結構的產生皆是相變化時應力消除的一種手段,同時亦 為材料內部自我調適 (self-accommodation) 的產物。 此外,我們也經由 TEM 的觀察量測 得 90 °電域結構其域界之平衡厚度約為 1-2nm 左右。 |
英文摘要 | Domain structure characteristics of lead titanate single crystals were studied using optical microscopy, electron microscopy and high resolution transmission electron microscopy. Results show that lead titanate crystals reveal surface relief after ferroelectric phase transition. Besides 90 ° and 180 ° domains, variant-like arrangements other than twin-related boundaries were constantly observed. Within the intersected regions of variants, finer substructures similar to twined-twins were observed as well. From the domain structure configurations, the amount of 90 ° domains overwhelms the quantity of 180 ° domains, indicating the dominant factor of the phase transformation might be mainly attributed to the elastic strain energy. This was also demonstrated by means of the measurement of resistivity variation as a function of the temperature. Therefore, the domain arrangements in lead titanate crystals are the results of the stress relief during phase transformation as well as the product of the self-accommodation of the internal structure within the specimens. Moreover, the equilibuium thickness of a 90 ° domain wall in the present case was estimated to be about 10 to 20 A using TEM observations. |
本系統中英文摘要資訊取自各篇刊載內容。