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研究生:彭靖婷
研究生(外文):Jing-Ting Peng
論文名稱:(Bi2Se3)1-x/(Bi2Te3)x 複合物製備及其熱電性質探討
論文名稱(外文):Preparation and Thermoelectric Properties of (Bi2Se3)1-x/(Bi2Te3)x Composites
指導教授:吳慶成
指導教授(外文):Ching-Cherng Wu
學位類別:碩士
校院名稱:國立東華大學
系所名稱:材料科學與工程學系
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2014
畢業學年度:102
論文頁數:64
中文關鍵詞:熱電材料(Bi2Te3)x/(Bi2Se3)1-x 複合物粉末冶金
外文關鍵詞:thermoelectric materials(Bi2Te3)x/(Bi2Se3)1-x compositespowder metallurgy
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本實驗選擇一熱電材料Bi2Se3為基材,在其中混和另一半導體材料Bi2Te3,其熔點較Bi2Se3低。利用材料熔點之差異,採用粉末冶金技術,製備複合材料(Bi2Te3)x/(Bi2Se3)1-x,其中x = 0、0.1、0.2、0.3。在溫度為Bi2Te3與Bi2Se3熔點之間,將Bi2Te3與Bi2Se3粉末燒結成型。藉由液相Bi2Te3在固相Bi2Te3基材中之擴散,期望產生近乎奈米級的微結構。
  然而依據XRD、SEM之量測結果發現:利用此法製作之複合物樣品,其主要結構大部分為單一相,推測是因為Te取代了Se原子而形成Bi2(TexSe1-x)3三原化合物及Te的析出。熱電量測的結果顯示在溫度範圍從50 K到400 K所有材料皆為n-type。電阻率、Seebeck係數、熱導率皆隨溫度的上升而增加;(Bi2Te3)x/(Bi2Se3)1-x x = 0.1樣品的電阻率比其他的樣品還小;添加Bi2Te3的樣品其Seebeck係數較純的Bi2Se3小;熱導率方面,(Bi2Te3)x/(Bi2Se3)1-x x = 0.2 樣品有比其他樣品還小的值。綜合熱電量測結果,可得到材料的ZT值,添加Bi2Te3,並沒有使Bi2Se3之優值得到改善。




關鍵字:熱電材料、 (Bi2Te3)x/(Bi2Se3)1-x複合物、粉末冶金。
In this study, Bi2Se3 was selected as a matrix material and a semiconductor material Bi2Te3 with lower melting point is incorporated to form microstructure in it. The (Bi2Te3)x/(Bi2Se3)1-x composites with x = 0, 0.1, 0.2 and 0.3 were prepared by powder metallurgy technique. As Bi2Te3 and Bi2Se3 powder were mixed homogeneously and sintered at the temperature between the melting point of Bi2Se3 and Bi2Te3. The liquidized Bi2Te3 may diffuse throughout the Bi2Se3 solid matrix and then form a microstructure in it.
 However, according to the results of XRD and FE-SEM, the composites prepared by the method we used, the main structure of the most samples are single phase. These results is attributed that Te atoms may substitute for Se atoms and that form ternary compounds and Te precipitates. The thermoelectric measurements show that all samples are n-type in temperature range from 50 K to 400 K. With increasing temperature, the resistivity, Seebeck coefficient and thermal conductivity increased. The resistivity of the sample (Bi2Te3)x/(Bi2Se3)1-x with x = 0.1 is smaller than other samples. The Seebeck coefficient of the pure Bi2Se3 is the largest. The thermal conductivity of the sample (Bi2Te3)x/(Bi2Se3)1-x with x = 0.2 is smaller than other samples. The dimensionless thermoelectric figure of merit ZT for these composites was evaluated and discussed. This study demonstrated that the ZT value of Bi2Se3 was not enhanced by addition of Bi2Te3 particles.
Key words : thermoelectric materials, (Bi2Te3)x/(Bi2Se3)1-x composites, powder metallurgy.
致謝 I
摘要 III
Abstract V
目錄 VII
圖目錄 IX
第一章 前言 1
1-1 研究背景 1
1-2 研究動機 5
第二章 基礎理論與文獻回顧 9
2-1 基礎理論 9
2-1-1 Seebeck效應【7-11】 9
2-1-2 Peltier效應【12-15】 11
2-1-3 Thomson效應【16-18】 13
2-2 熱電材料的物理性質 14
2-2-1電阻率【19】 14
2-2-2 熱傳導率【20-22】 17
2-2-3 Seebeck係數【9,23-25】 25
2-3 Bi2Te3、Bi2Se3基本特性與構造 28
2-3-1 Bi2Te3之基礎性質 28
2-3-2 Bi2Se3之基礎性質 30
第三章 實驗方法與步驟 33
3-1 材料製備與步驟 34
3-1-1 石英管處理 34
3-1-2 材料裝填及封管 35
3-1-3 搖擺爐熔融、淬火 37
3-1-4 粉末冶金 38
3-2結構與成分分析 40
3-2-1 粉末X光繞射 40
3-2-2 光學顯微鏡分析 40
3-2-3 場發射型掃描式電子顯微鏡(FE-SEM) 41
3-3熱電特性量測 42
3-3-1低溫冷卻系統 43
3-3-2 熱傳導率量測 43
3-3-3 Seebeck係數系統 44
3-3-4電阻率量測 46
3-3-5 實驗控制程式 47
第四章 結果與討論 51
4-1微結構與成份分析 52
4-1-1 X-ray繞射分析(XRD) 52
4-1-2 場發射型掃描式電子顯微鏡分析(FE-SEM) 53
4-2熱電性質分析 57
4-2-1 電阻率量測 57
4-2-2 Seebeck係數量測 58
4-2-3 熱傳導率量測 59
4-2-4 ZT值 60
第五章 結論 61
參考資料 63

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