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| 研究生： |
林垣豪 Lin, Yuan Hao |
|---|---|
| 論文名稱： |
熱電材料Ag(Sb1-xGex)Te2及AgSb(Te2-xSex)的物性研究 Physical Properties of the Thermoelectric Material of Ag(Sb1-xGex)Te2 and AgSb(Te2-xSex) |
| 指導教授： |
陳洋元
Chen, Yang Yuan |
| 學位類別： |
碩士
Master |
| 系所名稱： |
理學院 - 應用物理研究所 Graduate Institute of Applied Physics |
| 論文出版年： | 2016 |
| 畢業學年度： | 104 |
| 語文別： | 中文 |
| 論文頁數： | 42 |
| 中文關鍵詞： | 熱電材料 、高熱電優值 、低熱傳導系數 |
| 外文關鍵詞： | Thermoelectric materials, High ZT value, Low thermal conductivity |
| 相關次數： | 點閱：171 下載：3 |
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AgSbTe2是一種相當好的熱電材料，具有相當低的熱傳導係數以及接近於1的熱電優值(ZT值)。一些文獻中有提到此材料在約600 K左右會產生第二相。因此，在這篇論文中，我們希望能夠研究在不一樣比例摻雜的Ge、Se，使材料的熱電性質上的改變；爾後我們也希望藉由熱示差掃瞄卡量計(DSC(Differential Scanning Calorimeter))來驗證其他文獻中的結果：約600 K左右可以得到第二相。為了使樣品混和均勻，在製備樣品時，利用熔融及搖勻(Melting and Shaking)的方法，也就是將樣品熔融之後進行搖勻的動作，在樣品燒結成塊材之前，得到相對較均勻的樣品。我們一共使用了5種的比例合成Ag(Sb1-xGex)Te2、AgSb(Te2-xSex)，分別為：x = 0.01~0.05。在樣品燒結完成以後，將樣品進行破管，磨成細粉，為了在之後利用電漿火花燒結(SPS (Spark Plasma Sintering))壓製出我們所需要的樣品。進行量測時，我們利用了雷射熱擴散量測系統(LFA(Laser Flash Apparatus))以及賽貝克係數與電阻率量測系統ZEM-3得到我們所需要的熱傳導係數、電傳導係數、賽貝克係數(Seebeck係數)、以及功率因子(Power factor)，利用這幾個得到的參數計算，得到我們所需要的熱電優值(ZT值)。其後我們也為了知道是否在600 K左右得到相變，利用了熱示差掃瞄卡量計(DSC(Differential Scanning Calorimeter))來做量測，在600-630 K左右我們兩種摻雜的樣品得到了第二相的變化，使熱傳導係數大幅下降。最後我們得到最高的熱電優值為摻雜Ge比例0.03的樣品，在680 K左右可以得到熱電優值為2.5；Se摻雜比例0.05的樣品，在660 K可以達到2.02左右。
第一章 緒論 11
1.1. 研究背景及動機 11
第二章 基本原理及儀器介紹 12
2.1 熱電原理 12
2.1.1 Seebeck效應 12
2.1.2 Peltier 效應 13
2.1.3 Thomson效應 14
2.2. 熱電優值 14
2.2.1 熱電材料ZT值 14
2.2.2 熱電優值定義 15
2.3 量測儀器及量測原理介紹 15
2.3.1 X光繞射儀(X-ray Diffraction) 15
2.3.2 火花電漿燒結(Spark Plasma Sintering)[1] 17
2.3.3 熱傳導系數量測(Laser Flash Apparatus)[2][3] 18
2.3.4賽貝克係數(Seebeck係數)以及電阻率量測(ZEM-3) 19
2.3.5 比熱量測(Differential Scanning Calorimeter) 21
2.3.6 密度量測(阿基米德) 22
第三章 實驗步驟 22
3.1 樣品製備 23
3.1.1 樣品配製 23
3.2 清洗石英管、石英塞 23
3.3 封管 24
3.4 Melting and Shaking 25
3.5 高溫爐燒結 25
3.6 破管、研磨、過篩 26
3.7 SPS燒結 26
第四章 實驗結果及分析 28
4.1 X光繞射(X-ray diffraction)結果分析 28
4.2 熱電性質量測結果以及分析 32
4.2.1 電阻率量測結果及分析 32
4.2.2賽貝克係數(Seebeck係數)量測結果及分析 33
4.2.3 熱傳導系數量測結果以及分析 34
4.2.4 熱電優值(ZT值) 36
第五章 結論 38
參考文獻 39
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