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研究生:盧義川
研究生(外文):Lu. I-Chuan
論文名稱:鉍化碲硒Bi2Te3-xSex之晶體成長與特性分析
論文名稱(外文):Growth and Characterization of Bi2Te3-xSex Crystal
指導教授:吳慶成
學位類別:碩士
校院名稱:國立東華大學
系所名稱:材料科學與工程研究所
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:1999
畢業學年度:87
語文別:中文
論文頁數:117
中文關鍵詞:熱電材料電熱材料熱導係數
外文關鍵詞:thermoelectricseebeck coefficientthermal conductivity
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Bi2Te3化合物為室溫下典型的熱電材料,當添加Bi2Se3化合物於此材料後,即成為n-type的Bi2Te3-xSex三元化合物,本實驗使用布氏(Bridgman)長晶法成長,且分別用x=0.12、0.45、0.6和0.85的配比成長晶體。成長出的材料使用光學顯微鏡和SEM觀察表面狀況,且以EDS做定性分析和用EPMA做定量分析,最後量測出各管的電阻率ρ、Seebeck Coefficient α和Thermal Conductivity λ,且算出Z值(Z=α2/(ρλ))分析其電熱特性的優劣。

The semiconducting alloys of Bi2Te3 with Bi2Se3, which form pseudo-ternary solid solutions, are known as the better materials currently available for thermoelectric applications near room temperature. In this study, the single crystals of n-type Bi2Te3-xSex (x=0.12; 0.45; 0.6; 0.85)were grown by the Bridgman techniqe. Surface analysis of the alloys were observed by optical microscopy and SEM. The compostion is investigated by EDS and EPMA. The electrical resistivity ρ , Seebeck coefficient α and thermal conductivity λ measurements were carried out to evatuate the figure of merit of these materials.

第一章 序論 1
第二章 文獻回顧 7
2.1 ZT值 7
2.2 成長方式 14
2.3 相圖 16
2.4 顯微結構 20
2.5 結晶結構和化學鍵結 23
2.6 電特性 29
第三章 實驗方法與步驟 38
3.1 儀器設備 38
3.1.1 布氏(Bridgman)長晶系統 38
3.1.2 真空設備 39
3.1.3 搖擺爐 39
3.2 晶體成長製程 41
3.2.1 材料製備 41
3.2.2 石英管的處理 41
3.2.3 材料裝填與封管 42
3.2.4 晶體成長 42
3.3電熱特性量測方法與步驟 42
3.3.1 電阻率(Electrical Resistivity) 43
3.3.2 塞貝克係數(Seebeck Coefficient) 44
3.3.3 熱導係數(Thermal Conductivity) 46
第四章 實驗結果與討論 53
4.1 晶體成長 53
4.1.1 成長後的塊材 53
4.1.2 EDS量測 56
4.1.3 EPMA量測 70
4.2電熱性質量測 83
4.2.1 電阻率量測 83
4.2.2 Thermal Conductivity量測 91
4.2.3 Seebeck Coefficient量測 97
4.2.4 Figure of Merit(Z值)的計算結果 98
4.3 綜合結果 105
第五章 總結 109
參考文獻 112

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