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研究生： 曾郁翔
Tseng, Yu-Shiang
論文名稱： Sr 晶格空缺對SrSi2熱電性質之影響
Effects of lattice vacancies on the thermoelectric performance of SrSi2
指導教授： 呂欽山
Lue, Chin-Shan
學位類別： 碩士
Master
系所名稱： 理學院 - 物理學系
Department of Physics
論文出版年： 2013
畢業學年度： 101
語文別： 中文
論文頁數： 64
中文關鍵詞： 矽化物 、熱電材料 、晶格空缺
外文關鍵詞： Lattice vacancy, SrSi2
相關次數： 點閱：102  下載：1 
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    • 本篇論文是研究Sr的晶格空缺對SrSi2熱電性質的影響，我們以Ba、Ca摻雜SrSi2，測量10K~300K溫度下， 有Sr晶格空缺之SrxBa0.1Si2 (x = 0.9、0.83、0.77、0.7)與SrxCa0.1Si2 (x =0.9、0.83、0.77、0.7)合金的電阻率、熱導率以及Seebeck coefficient，並計算出熱電優質(figure of merit)ZT。我們發現在室溫下SrxBa0.1Si2 (x = 0.9、0.83、0.77、0.7)和SrxCa0.1Si2 (x = 0.9、0.83、0.77、0.7)的電阻率和Seebeck coefficient都隨著Sr的晶格空缺增加而相對減少，而在熱導率方面，Ba摻雜的熱導率隨著Sr晶格空缺的增加而增加，但是Ca摻雜的合金熱導率卻隨著Sr晶格空缺的增加有顯著減少，在Ca摻雜的部分，SrxCa0.1Si2 (x = 0.9、0.83、0.77、0.7)在x = 0.77時有最低的熱導率κ = 1.66(W/m K)左右，我們期待在這個系列SrxCa0.1Si2 (x = 0.9、0.83、0.77、0.7)使Sr晶格缺陷增加造成聲子與晶格無序散射效應增強，如此使熱導率κ下降，而實驗數據顯示SrxCa0.1Si2 (x = 0.9、0.83、0.77、0.7)在x = 0.77時，ZT值比在室溫中沒有Sr晶格空缺的Sr0.9Ca0.1Si2大了兩倍，約為0.27左右。

    We report a study of the temperature-dependent electrical resistivity, Seebeck coefficient, and thermal conductivity in the SrxBa0.1Si2 (x = 0.9、0.83、0.77、0.7)and SrxBa0.1Si2 (x = 0.9、0.83、0.77、0.7) alloys to elucidate the vacancy effect on the thermoelectric performance, characterized by the figure-of-merit, ZT. The room-temperature electrical resistivity and Seebeck coefficient were found to decrease through the introduction of vacancies onto the Sr sites of SrxBa0.1Si2 (x = 0.9、0.83、0.77、0.7)and SrxCa0.1Si2 (x = 0.9、0.83、0.77、0.7). Though, the room temperature thermal conductivity of Sr0.9Ba0.1Si2 increases with more lattice vacancies. It is of great importance that the room-temperature thermal conductivity of these samples substantially reduces upon introducing vacancies. Such a promising result leads to a significant enhancement in the ZT value as compared to the non-vacancy compound Sr0.9Ca0.1Si2. Namely, the highest room-temperature ZT value of 0.27 was obtained for Sr0.77Ca0.1Si2, about two times larger than that of Sr0.9Ca0.1Si2.

    第一章 前言 1 1-1 熱電材料簡介 1-2 矽化物SrSi2簡介 1-3 膺能隙 1-4 研究動機 第二章 基礎理論 15 2-1 電傳導率(Electric conductivity) 2-2 熱傳導率(Thermal conductivity) 2-3 倒逆過程(Umklapp process) 2-4 晶格空缺(Lattice vacancy) 2-5 Seebeck coefficient 2-6 熱電優值ZT(Figure of merit) 第三章 樣品製備與量測 33 3-1 樣品製作過程 3-2 樣品物性參數量測 3-2.1 X-ray量測 3-2.2 電阻率量測 3-2.3 熱傳導率量測 3-2.4 Seebeck coefficient量測 第四章 結果與數據討論分析 40 4-1 X-ray分析 4-2 電阻率量測結果 4-3 熱導率與溫度關係 4-4 Seebeck coefficient與溫度關係 4-5 熱電優質ZT(figure of merit)結果分析 第五章 結論 57 參考文獻 61 圖目錄 圖1-1 SrSi2晶格結構 2 圖1-2 SrSi2個軌域態密度圖1 4 圖1-3 外加壓力對SrSi2電阻值的影響10 5 圖1-4 外加壓力對SrSi2能隙的影響10 5 圖1-5 Sr1-xBaxSi2對單位晶格體積變化關係圖11 6 圖1-6 Sr1-xBaxSi2能隙對單位體積變化關係圖11 6 圖1-7 SrAlxSi2-x晶格常數與X-ray晶格繞射圖17 7 圖1-8 SrAlxSi2-x 電阻率、熱導率、Seebeck coefficient與ZT值對溫度關係圖17 8 圖1-9 Sr1-xYxSi2晶格常數及X-ray晶格繞射圖9 9 圖1-10 Sr1-xYxSi2電阻率、熱導率、Seebeck coefficient與ZT值對溫度關係圖9 10 圖1-11 Sr1-xCaxSi2、Sr1-xBaxSi2 X-ray晶格繞射圖19 11 圖1-12 Sr1-xCaxSi2、Sr1-xBaxSi2之晶格常數19 12 圖1-13 Sr1-xCaxSi2、Sr1-xBaxSi2之電阻率對溫度關係圖19 12 圖1-14 Sr1-xCaxSi2、Sr1-xBaxSi2之熱導率對溫度關係圖19 12 圖1-15 Sr1-xCaxSi2、Sr1-xBaxSi2之Seebeck coefficient對溫度關係圖19 13 圖1-16 Sr1-xCaxSi2、Sr1-xBaxSi2之Seebeck coefficient對溫度關係圖19 13 圖2-1熱傳導聲子碰撞過程 22 圖2-2 材料熱導率對溫度關係圖 24 圖2-3 Seebeck效應迴路示意圖 30 圖3-1四點探針測量法(four-point probe method) 36 圖3-2 樣品熱導率量測示意圖 38 圖4-1 SrxBa0.1Si2 (x = 0.9、0.83、0.77、0.7)X-ray繞射圖 40 圖4-2 SrxCa0.1Si2 (x = 0.9、0.83、0.77、0.7)X-ray繞射圖 41 圖4-3 SrxBa0.1Si2 (x = 0.9、0.83、0.77、0.7)缺陷濃度與晶格常數關係圖 42 圖4-4 SrxCa0.1Si2 (x = 0.9、0.83、0.77、0.7)缺陷濃度與晶格常數關係圖 43 圖4-5 SrxBa0.1Si2 (x = 0.9、0.83、0.77、0.7)電阻率對溫度關係圖 45 圖4-6 SrxCa0.1Si2 (x = 0.9、0.83、0.77、0.7)電阻率對溫度關係圖 45 圖4-7 SrxBa0.1Si2 (x = 0.9、0.83、0.77、0.7)熱導率對溫度關係圖 46 圖4-8 SrxCa0.1Si2 (x = 0.9、0.83、0.77、0.7)熱導率對溫度關係圖 47 圖4-9 SrxBa0.1Si2 (x = 0.9、0.83、0.77、0.7)電子熱導與聲子熱導對溫度關係 48-49 圖4-10 SrxCa0.1Si2 (x = 0.9、0.83、0.77、0.7)電子熱導與聲子熱導對溫度關係 50-51 圖4-11Sr0.9Ca0.1Si2 與Sr0.77Ca0.1Si2 熱導率比較圖 52 圖4-12 SrxBa0.1Si2 (x = 0.9、0.83、0.77、0.7)Seebeck coefficient對溫度關係圖 53 圖4-13 SrxCa0.1Si2 (x = 0.9、0.83、0.77、0.7)Seebeck coefficient對溫度關係圖 54 圖4-14 SrxBa0.1Si2 (x = 0.9、0.83、0.77、0.7)ZT值對溫度關係圖 56 圖4-15 SrxCa0.1Si2 (x = 0.9、0.83、0.77、0.7)ZT值對溫度關係圖 56 圖5-1 SrxCa0.1Si2高溫熱電參數估算值 59

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