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系統識別號 U0026-0507201315242000
論文名稱(中文) Sr 晶格空缺對SrSi2熱電性質之影響
論文名稱(英文) Effects of lattice vacancies on the thermoelectric performance of SrSi2
校院名稱 成功大學
系所名稱(中) 物理學系碩博士班
系所名稱(英) Department of Physics
學年度 101
學期 2
出版年 102
研究生(中文) 曾郁翔
研究生(英文) Yu-Shiang Tseng
學號 l26001058
學位類別 碩士
語文別 中文
論文頁數 64頁
口試委員 指導教授-呂欽山
口試委員-朱明文
口試委員-張烈錚
中文關鍵字 矽化物  熱電材料  晶格空缺 
英文關鍵字 Lattice vacancy  SrSi2 
學科別分類
中文摘要 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。
英文摘要 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.
論文目次 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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