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研究生:莫文皓
論文名稱:釕系雙鈣鈦礦單晶Sr2-xPbxYRuO6之晶體結構與磁性性質研究
論文名稱(外文):Study of The Crystal Structure and Magnetic Properties of Ru-based Double Perovskite Single Crystal Sr2-xPbxYRuO6
指導教授:林滄浪吳茂昆
學位類別:碩士
校院名稱:國立清華大學
系所名稱:工程與系統科學系
學門:工程學門
學類:核子工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:54
中文關鍵詞:雙鈣鈦礦結構
外文關鍵詞:Double Perovskite
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本論文主要探討使用助溶劑的方法來成長Sr2-xPbxYRuO6單晶。單晶相關的物理性質也藉由X-ray粉末繞射、樣品成份分析、以及磁性性質量測來做系統化的探討。
樣品成份分析的結果顯示,銅離子並無法進入結構中取代部份的釕離子,這與我們當初的目標,即銅離子少部份取代釕離子,引致超導現象的產生有所差異。同時,在助溶劑中的鉛離子,部份跑入了結構中,同時形成了SrRu1-xPbxO3的第二相。
由磁性性質的量測結果顯示,單晶在140 K有一鐵磁的相變,同時在31 K有一反鐵磁的相變產生。由高磁場下量測所得的磁化率曲線得知,單晶磁性的主要結構相為反鐵磁相,而鐵磁相為源自於SrRu1-xPbxO3的第二相所產生。
In this thesis, we have grown the Sr2-xPbxYRuO6 single crystal by using flux growth technique. Systematic studies on the physical properties of the crystals were performed, including X-ray diffraction, sample characterization and magnetic measurement.

According to the characterization analysis, the copper ion was not doped into the crystal which was suggested being partial doped to the ruthenium site and thus resulted in a superconductivity behavior. On the other hand, the Lead ion, which was come from the flux, may substitute into the lattice, and form a second phase which was indicated to be the SrRu1-xPbxO3 phase.

The magnetic susceptibility data suggest that the crystal show ferromagnetic ordering at 140 K and antiferromagnetic ordering below 31 K. The susceptibility data which was measuring at high field indicated that the main phase of the compound is antiferromagnetic, and the ferromagnetic behavior is related to the SrRu1-xPbxO3 phase.
TABLE OF CONTENTS

ABSTRACT............................ i
ACKNOWLEDGEMENTS......................iii
TABLE OF CONTENTS.......................iv
LIST OF FIGURES......................... vi
LIST OF TABLE..........................viii

Chapter 1 Introduction   1
1.1 Background and Overview of Double Perovskites......... .1
1.2 Motivation..........................7

Chapter 2 Experimental Details    10
2.1 Sample Preparation and Characterization............. 10
2.2 Powder X-ray Diffraction Analysis............... 14
2.3 Magnetic Properties Measurement............... 16
2.4 Scanning Electron Microscope (SEM).............. 18

Chapter 3 Results and Discussion 20
3.1 Crystal Structure and Characterization.............. 20
3.2 Magnetization and susceptibility................ 36

Chapter 4 Conclusion 53

References
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