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系統識別號 U0026-0807201911161500
論文名稱(中文) 介金屬RE2Ru3Ge5(RE = La, Ce, Pr, Sm)之物理性質之研究
論文名稱(英文) Study of physical properties of intermetallic compounds RE2Ru3Ge5(RE = La, Ce, Pr, Sm)
校院名稱 成功大學
系所名稱(中) 物理學系
系所名稱(英) Department of Physics
學年度 107
學期 2
出版年 108
研究生(中文) 許家峻
研究生(英文) Chia-Chun Hsu
學號 L26061147
學位類別 碩士
語文別 英文
論文頁數 53頁
口試委員 指導教授-呂欽山
口試委員-張烈錚
口試委員-許華書
中文關鍵字 U2Co3Si  RE2Ru3Ge5 
英文關鍵字 U2Co3Si  RE2Ru3Ge5 
學科別分類
中文摘要 RE2Ru3Ge5(RE = Pr, Sm)有兩種晶格結構,一個是Sc2Fe3Si5結構,另外一個是U2Co3Si5結構,其中Sc2Fe3Si5結構的RE2Ru3Ge5已經有相關的研究,雖然有人使用電弧熔融法製備U2Co3Si5結構的Pr2Ru3Ge5和Sm2Ru3Ge5,但是這兩個化合物仍然缺乏相關的物理性質的資訊。除此之外,U2Co3Si5結構的La2Ru3Ge5 與Ce2Ru3Ge5有兩種製備方法,分別是電弧熔融法和助熔劑法。使用助熔劑法所產出的樣品尺寸太小,所以無法量測廣泛的物理性質。雖然La2Ru3Ge5 與Ce2Ru3Ge5已經有使用電弧熔融法產出樣品的相關資訊,但是只有結構上的分析卻沒有一般物理性質的實驗結果,所以本篇論文以電阻率、熱電係數、熱導率、磁化率以及比熱去探討使用電弧熔融法產出的U2Co3Si5結構的RE2Ru3Ge (RE = La, Ce, Pr, Sm) 的物理性質。實驗結果發現La2Ru3Ge5呈現一般金屬的性質,但是Ce2Ru3Ge5, Pr2Ru3Ge5和Sm2Ru3Ge5都有發生變化而且它們的變化溫度分別在170、140和245 K左右。此外藉由同步輻射光源的X-ray繞射得知在相變溫度附近有晶格變形。根據這些結果, Sm2Ru3Ge5是一個半金屬而且可能是一種具有電荷密度波行為的材料。
英文摘要 RE2Ru3Ge5 (RE = Pr, Sm) have two structures. One is Sc2Fe3Si5. The other is U2Co3Si5. There are already related studies about Sc2Fe3Si5-type RE2Ru3Ge5. Although some papers reported that U2Co3Si5-type Pr2Ru3Ge5 and Sm2Ru3Ge5 were manufactured by means of arc-melting, the information of physical properties of U2Co3Si5-type RE2Ru3Ge5 (RE = Pr, Sm) is still lacking. In addition, there are two methods for manufacturing RE2Ru3Ge5(RE = La, Ce). One is In-flux and the other is arc-melting. La2Ru3Ge5 and Ce2Ru3Ge5 prepared through In-flux are not large enough for measurements of general physical properties13. La2Ru3Ge5 and Ce2Ru3Ge5 have already been produced by arc-melting, but there are only results for crystal structure analysis and no experimental results of physical properties. Therefore, we use arc-melting to prepare U2Co3Si5-type RE2Ru3Ge5 (RE = La, Ce, Pr, Sm). They are explored by measuring electrical resistivity, Seebeck coefficient, thermal conductivity, specific heat, and magnetic susceptibility. From these experimental results, La2Ru3Ge5 behaves as an ordinary metal. However, Ce2Ru3Ge5, Pr2Ru3Ge5, and Sm2Ru3Ge5 exhibit variations at around temperature of the variations T*∼170, ∼140, and ∼245 K, respectively. In addition, the results of the synchrotron X-ray powder diffraction(SXRD) below and above T* confirm the appearance of the lattice distortion for Sm2Ru3Ge5. According to these results, Sm2Ru3Ge5 is a possible charge density wave (CDW) material.
論文目次 Contents
摘要 I
Abstract II
致謝 III
Contents IV
Chapter 1 Introduction 1
Chapter 2 Sample Preparation and Identification 4
Chapter 3 Basic Concepts 13
3-1 Electrical resistivity 13
3-2 Seebeck effect 15
3-3 Thermal conductivity 17
3-4 Curie-Weiss law 19
3-5 Specific heat 23
Chapter 4 Measurements 31
4-1 Cryocooler system 31
4-2 Electrical resistivity 32
4-3 Seebeck coefficient 33
4-4 Thermal conductivity 34
Chapter 5 Experimental Results and Discussion 35
5-1 Electrical resistivity 35
5-2 Seebeck coefficient 37
5-3 Thermal conductivity 38
5-4 Magnetic susceptibility 40
5-5 Specific heat 43
Chapter 6 Conclusions 48
Reference 51
Appendix 53
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