dc.contributor.advisor | 陳洋元 | zh_TW |
dc.contributor.advisor | Chen,Yang Yuan | en_US |
dc.contributor.author (Authors) | 李岷錡 | zh_TW |
dc.contributor.author (Authors) | Li Min Chi | en_US |
dc.creator (作者) | 李岷錡 | zh_TW |
dc.creator (作者) | Chi, Li Min | en_US |
dc.date (日期) | 2021 | en_US |
dc.date.accessioned | 2-Sep-2021 16:58:12 (UTC+8) | - |
dc.date.available | 2-Sep-2021 16:58:12 (UTC+8) | - |
dc.date.issued (上傳時間) | 2-Sep-2021 16:58:12 (UTC+8) | - |
dc.identifier (Other Identifiers) | G0108755012 | en_US |
dc.identifier.uri (URI) | http://nccur.lib.nccu.edu.tw/handle/140.119/136972 | - |
dc.description (描述) | 碩士 | zh_TW |
dc.description (描述) | 國立政治大學 | zh_TW |
dc.description (描述) | 應用物理研究所 | zh_TW |
dc.description (描述) | 108755012 | zh_TW |
dc.description.abstract (摘要) | 隨著21世紀的來臨,能源議題逐年被重視,許多新興材料以及相關研究課題正如火如荼進行中,其中之一的熱電材料,著眼於其無須透過機械裝置的耦合而可達到熱能與電能的直接互相轉換,近20年來不斷地被研究,其中Bi2Te3 因為其ZT最大值落在300~500 K之間,對於室溫範圍具有應用潛力,因此本論文之研究課題以Bi1.7Sb0.3Te.27Se0.3為基礎尋找具高熱電轉換效率之n型合金塊材,透過Sb及過量的Te參雜量的調制(Sb: 0.05-0.1, Te: 15-30wt%),尋找最佳熱電轉換效率之熱電材料,並研究不同的製程方式對ZT值的影響,分別使用布里奇曼法(Bridgman-Stockbarger Method)、高溫燒結(Furnace melting)、火花電漿燒結 (SPS)製備樣品,研究不同參雜比例對熱電性質的影響,製備之樣品以X光繞射儀(XRD)分析結晶相,X-光螢光分析儀 (XRF)確認元素成分比例,ZEM-3分析導電係數以與席貝克係數,並探討以上物理量、材料特性與不同長晶方法及成分之間的關係,以高溫燒結製備之Bi1.75Sb0.25Te2.7Se0.3樣品為參考,其材料優質係數ZT約為0.55, 而Bi1.75Sb0.25Te2.7Se0.3+15wt%Te使用布里奇曼法在750度每小時5 mm的長晶速率所製備之塊才其ZT則最高可達0.84,而火花電漿燒結系統在380度50 MPa的條件下所得到的材料其ZT值則達0.8,相較於Bi1.75Sb0.25Te2.7Se0.3之樣品均有顯著提升,添加Sb與Te確實可有效提升zT值,然而當Te添加量過多,zT值不升反降,研究結果顯示Te添加量不應超過20wt%,。 | zh_TW |
dc.description.abstract (摘要) | At the start of the 21st century, energy issues have been paid attention year by year, as a potential solution for saving energy, thermoelectric materials have attracted a lot of study in the past 20 years. Among thermoelectric materials, Bi2Te3, because its maximum ZT value falls between 300 and 500 K makes it a high application potential near the room temperature range. Therefore, we are interested in if the Bi2Te3-based materials can be tuned to even improved advance. This work focused on the n-type materials Bi1.7Sb0.3Te2.7Se0.3, looking for n-type alloy bulk materials with high thermoelectric conversion efficiency by doping level tuning of Sb and Te (Sb: 0.05-0.1, Te: 15-30wt%). Meanwhile, three synthesize methods Bridgeman-Stockbarger Method, Furnace melting, spark plasma sintering (SPS) are employed to study the influence of the method on the ZT values and effects on thermoelectric properties. The prepared samples are analyzed by X-ray diffractometer (XRD) and X-ray fluorescence analyzer (XRF) for identification of crystalline phases and the atomic ratio. The ZEM-3 and LFA are employed to study the electrical conductivity and Seebeck coefficient, and thermal conductivity, respectively. Taking the Bi1.75Sb0.25Te2.7Se0.3 sample that is prepared by the pre-melting method as a reference, the material figure of merit ZT is about 0.55. While the maxima ZTs of Bi1.75Sb0.25Te2.7Se0.3+15wt%Te that prepped by the Bridgman method (growth rate of 5 mm/hr at 750 degrees) and by the spark plasma sintering system (at 380 degrees 50 MPa) are reached up to 0.84 and 0.8, respectively. Which are significantly higher than that of the Bi1.75Sb0.25Te2.7Se0.3. However, the zT suppressed at high tuning level, which indicates that the Te tuning shall not higher than 20wt%. | en_US |
dc.description.tableofcontents | 致謝……………………………………………………………………………………iAbstract……………………………………………………………………………ii摘要…………………………………………………………………………………iii目錄…………………………………………………………………………………iv圖目錄………………………………………………………………………………vi表目錄 ………………………………………………………………………………ix第一章 緒論……………………………………………………………………11.1研究動機…………………………………………………………………………11.2 Bi2Te3熱電材料性質……………………………………………………………21.3熱電材料應用……………………………………………………………………5第二章 熱電基本原理……………………………………………………62.1 席貝克效應Seebeck Effect…………………………………………………62.2 帕爾帖效應 Peltier Effect…………………………………………………72.3 湯姆森效應 Thomson Effect…………………………………………………82.4 席貝克係數(S) ………………………………………………………………92.5 熱傳系數(K) …………………………………………………………………102.6 電導係數(σ) ………………………………………………………………122.7 優質係數(ZT) ………………………………………………………………132.8 轉換效率………………………………………………………………………15第三章 實驗方法與製程…………………………………………………163.1樣品前置作業………………………………………………………………163.1.1化學劑量法元素配置………………………………………………………163.1.2研磨…………………………………………………………………………173.1.3洗管…………………………………………………………………………183.1.4烤管…………………………………………………………………………183.1.5封管…………………………………………………………………………183.1.6氫氧焰………………………………………………………………………203.2樣品製程……………………………………………………………………223.2.1 高溫爐系統(firance) ……………………………………………………223.2.2 布里奇曼法(Bridgeman-Stockbarger Method) …………………………243.2.3 火花電漿燒結系統 (SPS) …………………………………………………273.2.4 鑽石切割機…………………………………………………………………293.3樣品量測……………………………………………………………………303.3.1 阿基米德密度量測…………………………………………………………303.3.2 LFA 閃光法熱傳導分析儀…………………………………………………313.3.3 Seebeck系數和電阻測試系統 (ZEM-3) …………………………………343.3.4 X光繞射儀(XRD) …………………………………………………………373.3.5 X-光螢光分析儀(XRF)……………………………………………………403.3.6 物理性質量測系統Physical Property Measurement System(PPMS) 42第四章 實驗結果與討論…………………………………………………434.1 Bi1.7+xSb0.3-xTe2.7Se0.3+15wt%Te (x=0、0.05、0.1)之單晶樣品…434.1.1 Bi1.7+xSb0.3-xTe2.7Se0.3+15wt%Te (x=0、0.05、0.1) Seebeck係數比較…464.1.2 Bi1.7+xSb0.3-xTe2.7Se0.3+15wt%Te (x=0、0.05、0.1) 電導係數比較………474.1.3 Bi1.7+xSb0.3-xTe2.7Se0.3+15wt%Te (x=0、0.05、0.1) 功率因子比較………484.1.4 Bi1.7+xSb0.3-xTe2.7Se0.3+15wt%Te (x=0、0.05、0.1) 熱傳導係數比較……494.1.5 Bi1.7+xSb0.3-xTe2.7Se0.3+15wt%Te (x=0、0.05、0.1) ZT比較………………504.1.6 XRF比較分析………………………………………………………………514.1.7 XRD比較分析………………………………………………………………534.1.8 PPMS載子濃度………………………………………………………………554.2 高溫燒結系列不同Te比例Bi1.7+xSb0.3-xTe2.7Se0.3(x=0.05、0.1)之塊材…………………………………………………………………………………564.2.1 不同Te比例 的Bi1.75Sb0.25Te2.7Se0.3+15wt%Te Seebeck係數比較………584.2.2 不同Te比例 的Bi1.75Sb0.25Te2.7Se0.3+15wt%Te電導係數比較……………594.2.3 不同Te比例 的Bi1.75Sb0.25Te2.7Se0.3+15wt%Te 功率因子比較……………604.2.4 不同Te比例 的Bi1.75Sb0.25Te2.7Se0.3+15wt%Te熱傳導係數比較…………614.2.5 不同Te比例 的Bi1.75Sb0.25Te2.7Se0.3+15wt%Te ZT比較……………………624.2.6 XRD比較分析………………………………………………………………634.3 SPS系列不同Te比例Bi1.7+xSb0.3-xTe2.7Se0.3 (x=0.05、0.1) 塊材654.3.1 不同Te比例Bi1.7+xSb0.3-xTe2.7Se0.3 (x=0.05、0.1) Seebeck係數比較…674.3.2 不同Te比例Bi1.7+xSb0.3-xTe2.7Se0.3 (x=0.05、0.1) 電導係數比較………684.3.3 不同Te比例Bi1.7+xSb0.3-xTe2.7Se0.3 (x=0.05、0.1) 功率因子比較………694.3.4 不同Te比例Bi1.7+xSb0.3-xTe2.7Se0.3 (x=0.05、0.1) 熱傳導係數比較……704.3.5 不同Te比例Bi1.7+xSb0.3-xTe2.7Se0.3 (x=0.05、0.1) ZT比較………………71第五章 結論…………………………………………………………………72參考文獻…………………………………………………………………………75 | zh_TW |
dc.format.extent | 6667120 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.source.uri (資料來源) | http://thesis.lib.nccu.edu.tw/record/#G0108755012 | en_US |
dc.subject (關鍵詞) | 熱電材料 | zh_TW |
dc.subject (關鍵詞) | 化學參雜 | zh_TW |
dc.subject (關鍵詞) | 布里奇曼法 | zh_TW |
dc.subject (關鍵詞) | 火花電漿燒結 | zh_TW |
dc.subject (關鍵詞) | 碲化鉍 | zh_TW |
dc.subject (關鍵詞) | Thermoelectric material | en_US |
dc.subject (關鍵詞) | Chemical doping | en_US |
dc.subject (關鍵詞) | Bridgman-Stockbarger Method | en_US |
dc.subject (關鍵詞) | Spark plasma sintering | en_US |
dc.subject (關鍵詞) | Bismuth Telluride | en_US |
dc.title (題名) | Bi1.7+xSb0.3-xTe2.7Se0.3+y wt%Te x=0、0.05、0.1 y=15、20、25 熱電性質研究 | zh_TW |
dc.title (題名) | The Thermoelectric Properties Study of Bi1.7+xSb0.3-xTe2.7Se0.3+y wt%Te x=0、0.05、0.1 y=15、20、25 | en_US |
dc.type (資料類型) | thesis | en_US |
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dc.identifier.doi (DOI) | 10.6814/NCCU202101332 | en_US |