查詢結果分析
來源資料
第1筆 /總和 1 筆
/ 1 筆
頁籤選單縮合
題 名 | 鈦鋯錫鈮酸鉛鐵電陶瓷之電性疲勞行為及微觀組織演變=Electric Fatigue Behavior and Microstructure Development of PNZST Ferroelectric Ceramics |
---|---|
作 者 | 寸永福; 周振嘉; | 書刊名 | 陶業學刊 |
卷 期 | 2:2 1998.07[民87.07] |
頁 次 | 頁20-30 |
分類號 | 440.33 |
關鍵詞 | 鐵電性; 反鐵電性; 電性疲癆; 微結構; 磁區; 穿透式電子顯微鏡; Ferroelectric; Antiferroelectric; Electric fatigue; Microstructure; Domain; Transmission electron microscopy; |
語 文 | 中文(Chinese) |
中文摘要 | 各式的鐵電材料,無論要應用至何種領域,均需克服材料電性疲勞的問題,因此 相關於疲勞的研究就成了日漸重要的課題。本文即針對鈦鋯錫鈮酸鉛鐵電陶瓷之電性疲勞 行為及微觀演變作一有系統之研究。文中以鐵電相與反鐵電相成分相互對照,施以疲勞測試 至萬次,二種相之極化值和電滯曲線形狀均有明顯的改變,微觀方面則均自單純之微組織逐 漸轉變為交錯電域結構最後產生複雜的微結構,其中包含多量的扭曲變形、差排及裂縫。 |
英文摘要 | Electric fatigue properties of Niobium-doped Lead Zirconate Stanate Titante (PNZST) Ceramics were investigated using P-E measurements and the corresponding microstructre evolution was studied by transmission electron microscopy.In the ferroelectric phase (PE) phase region,the results show that remnant polarizations and saturated polarizations decrease with cycles of loading and the slopes of the P-E curves at E �� become less steeper gradually Domain boundaries were induced under repeated electric field application and the microstructures become more and more complicated due to domain intersection. Once domains intersect severely, mobility of domain boundaries becomes inferior and the polarization of the materials starts to decrease. The interesection of domain boundaries introduces great strain field in the materials and a large amount of dislocations and microcracks were produced in certain grains when the specimens were loaded for 10 �� cycles. In contrast, the remnant polarization f the ferroelectric PNZST had degraded to 80% of their initial value. In the antiferroelectric phase (AFE) phase of PNZST, the P-E courves vary with cycles of electrical field and the saturated polarization values decrease slightly.The electric induced phase transformation occurs more sluggish and the necks of P-E curves become wider. In microstructure observation we found remnant FEphases exist when electrical filed switching 10 �� times.After fatigue testing, microstructures become complicated, like that in the PE phase, there are many defects,strain-induced- contrasts and some microcracks. |
本系統中英文摘要資訊取自各篇刊載內容。