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研究生： 楊佳明
Yang, Chia-ming
論文名稱： 新型鐵基超導材料FeSe 之性質研究
The Property of New Kind Iron-Based Superconductor FeSe
指導教授： 陳引幹
Chen, In-gann
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： 2009
畢業學年度： 97
語文別： 中文
論文頁數： 104
中文關鍵詞： 硒化鐵 、鐵基超導體 、超導體
外文關鍵詞： FeSe, superconductor
相關次數： 點閱：60  下載：2 
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    • 本研究以固態燒製法製成新型鐵基超導材料FeSe系統並分別針對純化並去除FeSe-β相、摻雜不同價電荷離子於FeSe系統、Li離子於FeSeTe複合系統、以及FeSe晶體成長等四主題進行探討。FeSe純化研究主要以不同Fe、Se劑量比及低溫熱處理方式，期望能去除高溫相及鐵粉氧化問題，並得到β相並非混粉不均或高溫相保留等原因造成。不同價電荷離子摻雜包含鹼金族及稀土族等離子摻雜，並得到純度會因摻雜比例上升而下降，而相對會造成Tc寬化及反磁能力下降。Li離子於FeTeSe複合系統摻雜，則得到Tc上升1.5K且反磁能力亦獲得改善。根據拉曼及XRD結果比較可證明Li離子有成功置入FeTeSe晶格而並未置入FeSe晶格，並且置入晶格時若破壞電子自旋長程對稱性則會降低超導的反磁能力。最後，本研究以簡易Bridgman法成長FeSe晶體，得到最方向性多晶約為5mm×2mm。

    The high quality of FeSe powder were synthesized by solid state sintering in this study, and there are four main subjects will be discussed: purify FeSe andβ-phase eliminate, doping with different kinds of valence ion in FeSe, doping in FeSeTe combine system, and FeSe crystal growth. The purify process like changing ratio of Fe/Se and low temperature annealing which assume can overcome high temperature phase residual and iron oxidization. Alkali metal and Rare earth groups’ ion was doped in FeSe and displayed decrease in purity which also caused decreasing in diamagnetic force. Otherwise, Li ion doping in FeSeTe combine system increase Tc and diamagnetic force obviously. From Raman and XRD result can prove that Li ion insert into FeSeTe lattice successfully but fail in FeSe. And the diamagnetic force decreased when the insert ion break long-range-order symmetry. Finally, the 5mm×2mm prefer orientation crystal was grown by simple Bridgman method.

    摘要 I Abstract II 誌謝 III 目錄 V 表目錄 VIII 圖目錄 IX 圖目錄 IX 第一章 緒 論 1 1-1 前 言 1 1-2 鐵基超導體的發現 2 1-3研究目的 3 第二章 理論基礎與文獻回顧 5 2-1超導體的發現與基礎理論 5 2-1.1 超導體的發現 5 2-1.2超導體特性 6 2-1.3 弱接點效應及超導界體分類 8 2-1.3.1 BCS理論 8 2-1.3.2弱接點效應 8 2-1.3.3 GL理論及超導界面能 9 2-1.3.4界面能與超導體分類 10 2-1.3.5 釘扎中心、臨界電流與Bean model 12 2-2 高溫銅氧超導體 14 2-2.1 銅氧類超導體起源 14 2-2.2 銅氧類超導體結構 15 2-2.3 銅氧類超導體特性 15 2-3 新一代鐵化合物超導體 17 2-3.1 順磁性與反磁性[22] 17 2-3.2 鐵化合物高溫超導現象 18 2-3.3 鐵基超導化合物之特性及組態 19 2-3.4 層狀鐵硒介金屬化合物 20 2-3.5 鐵硒化合物近期研究 21 2-3.6 鐵硒化合物超導機制 22 第三章 實驗方法及步驟 38 3-1 實驗材料 38 3-2 硒化鐵粉末製作 38 3-2-1固態燒結法流程 38 3-2.3 FeSe混合比例改變 39 3-2.4不同價數離子摻雜 39 3-2.5粉末熱處理 39 3-3 硒碲鐵金屬化合物粉末製作 40 3-4 硒化鐵單晶成長 40 3-5 性質分析 41 3-5.1 粉末之熱性質分析 41 3-4.2 相成分之鑑定 41 3-4.3 微結構觀察 42 3-4.4 超導性能的量測 42 3-4.5 析出物成分分析 43 3-4.6 拉曼光譜分析 43 第四章 結果與討論 49 4.1 FeSe的燒製以及純化 49 4.1.1 純度及超導溫度的定義 49 4.1.2 不同氣氛及溫度對FeSe的影響 50 4.1.3 FeSe粉末純化 50 4.2 以不同價電荷離子摻雜FeSe及性質影響 52 4.2.1鹼金族離子摻雜 52 4.2.2 稀土族離子摻雜 53 4.3 FeSeTe複合系統 54 4.3.1 不同FeSeTe比率與臨界溫度探討 54 4.3.2 Li離子摻雜對FeSeTe複合系統影響 55 4.3.3 Li離子摻雜對FeSeTe複合系統綜合比較 56 4.4 FeSe單晶成長及超導性質異相性探討 58 4.4.1 管型爐靜態爐溫分佈及動態量測 58 4.4.2 FeSe大尺寸多晶粒成長 59 4.4.3 FeSe多晶體之SQUID量測 60 第五章 結論 99 參考文獻 101

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