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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
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dc.contributor.advisor | 陳政維(Jenq-Wei Chen) | |
dc.contributor.author | Guan-Ru Chiou | en |
dc.contributor.author | 邱冠儒 | zh_TW |
dc.date.accessioned | 2021-06-16T13:15:15Z | - |
dc.date.available | 2013-08-06 | |
dc.date.copyright | 2013-08-06 | |
dc.date.issued | 2013 | |
dc.date.submitted | 2013-07-29 | |
dc.identifier.citation | References
1. G. Lawes , T. Kimura , C.M. Varma , M.A. Subramanian , N. Rogado , R.J. Cava , A.P. Ramirez, Progress in Solid State Chemistry 37 (2009) . 2. G Lawes and G Srinivasan, J. Phys. D: Appl. Phys. 44 (2011). 3. L. J. Ding, K. L. Yao and H. H. Fua, J. Mater. Chem., 2011, 21, 449–455. 4. A.C. Mclaughlin, Solid State Communications 137 (2006) 354–357. 5. Edmund J. Cussen,* Danny R. Lynham, and Joseph Rogers, Chem. Mater. 2006, 18, 2855-2866. 6. D. Szwagierczak, A CTA PHYSICA POLONICA A, Vol. 121 (2012). 7. J. Krishna Murthy and A.Venimadhav, J. Appl. Phys. 111, 024102 (2012). 8. C. D. Brandle and H. Steinfink, Inorg, Chem., 10 (1971) 922. 9. N. G. Parkinson et al., J. Mater. Chem. 15, 1375(2005). 10. Y. Sasaki et al., J. Mater. Chem. 12, 2361 (2002). 11. E. J. Cussen et al., Chem. Mater. 18, 2855 (2006). 12. A. C. Mclaughlin, PHYSICAL REVIEW B 78, 132404 (2008). 13. Hewlett-Packard Inc., Basics of Measuring the Dielectric Properties of Materials, Application Note 1217-1. 14. D. C. Sinclair F. D. Morrison, and A. R. West, J. Am. Ceram., Soc. 84, 31 (2001). | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/61839 | - |
dc.description.abstract | 此篇論文主要探討Ba2ReMo6化合物的介電性質,這一系列的化合物都是採用固態反應法合成。藉由X-RAY分析可以知道此類化合物結構均為立方晶系,我們以溫度和頻率作變數來量測介電常數(ε’),介電損失(tan δ),複數modulus(M’, M’’)來分析這些化合物的特性。所有的樣品在ε’ (T) 的圖中,介電常數皆呈階梯式增加,並且皆對應一個峰值在 tan δ 圖中。我們利用複數modulus 的計算來辨別出 grain 和 grain boundary 對整個介電系統的影響。在Ba2SmMoO6樣品,我們發現在tan δ的兩個峰值,其中之一個峰值的溫度(~ 160 K)對應到此樣品磁相變附近的溫度,可以證實此唯一多鐵材料。此一多鐵材料可以提供後人對多鐵材料性質去做更深入探討及研究 | zh_TW |
dc.description.abstract | The synthesis, characterization and dielectric properties of polycrystalline Ba2ReMoO6 (Re = lanthanide or Y ion) compounds were investigated in this thesis. Powder X-ray diffraction patterns reveal that all the samples are single phase cubic structure with Fm3m space group. The refined lattice parameters and volume obey the Lanthanide contraction rule.
The dielectric properties of these compounds were studied in the frequency range from 20 Hz to 1 MHz between 20 K and 320 K. The Ba2SmMoO6 sample exhibits a high dielectric permittivity (ε' ~ 104) at room temperature with frequency dispersion. In addition, ε'(T) also show a two steps like increases at low temperature. The corresponding tanδ(T) curves exhibit two relaxations at T < 60 K and ~ 160 K. The peak temperature TP of tanδ(T) shifts to a higher temperature as the frequency increases in both relaxations. The overall behavior of high temperature ε' and tanδ is similar to that observed in giant dielectric constant materials. The dielectric properties of Re = Nd, Eu, and Y are also exhibits two relaxations. Whereas Re = Gd and Dy show only one dielectric relaxation. The observed giant dielectric response was explained in terms of internal (grain boundary) barrier layer capacitance (IBLC) [6] effect and relaxation at ~ 160 K is related to the development of long-range antiferromagnetic order. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T13:15:15Z (GMT). No. of bitstreams: 1 ntu-102-R00222068-1.pdf: 4520592 bytes, checksum: b27dd27f05eaf2b97df34924af8ee493 (MD5) Previous issue date: 2013 | en |
dc.description.tableofcontents | Table of Contents
誌謝 i Abstract iii Table of Contents v Chapter 1 Introduction 1 Chapter 2 General Background 4 a. Complex Permittivity 4 b. The Mechanism of Polarization 6 c. Debye Equations 9 d. Arrhenius law 11 Chapter 3 Experimental Details 12 A. Sample Preparation for Ba2RMoO6(R = Y, Nd, Sm, Eu, Gd, Dy) 12 B. X-ray diffraction 13 Chapter 4 Results and Discussion 15 a.Ba2SmMoO6 15 b.Ba2EuMoO6 21 c.Ba2GdMoO6 27 d.Ba2DyMoO6 32 e.Ba2YMoO6 37 f.Ba2NdMoO6 42 Chapter 5 Conclusion 48 References 52 List of Figures Fig.1 The crystal structure of the Ba2ReMoO6 primitive cubic perovskite is indicated. (Gd: red Mo: gray O: green Ba:blue) 3 Fig. 2.1 Schematic representation of the different polarization mechanisms [13]. 7 Fig. 2.2 Contribution of the different polarization mechanisms to the frequency dependence of the relative permittivity [14]. 8 Fig. 4.a.1 X-ray diffraction pattern of the Ba2SmMoO6 compound with Miller indices of the peaks. 17 Fig. 4.a.2 ε’-T of Ba2SmMoO6 . 18 Fig. 4.a.3 tanδ-T relation of Ba2SmMoO6. 18 Fig. 4.a.4 Activation energy values of Ba2SmMoO6 from Arrhenius plot. 19 Fig. 4.a.4 Activation energy values of Ba2SmMoO6 from Arrhenius plot. 19 Fig. 4.a.5 Cole-Cole plot of Ba2SmMoO6 . 20 Fig. 4. b.1 X-ray diffraction pattern of the Ba2EuMoO6 compound with Miller indices of the peaks. 23 Fig. 4.b.2 ε’-T of Ba2EuMoO6. 24 Fig. 4.b.3 tanδ-T relation of Ba2EuMoO6. 24 Fig. 4.b.4 Activation energy values of Ba2EuMoO6 from Arrhenius plot. 25 Fig. 4.b.5 Activation energy values of Ba2EuMoO6 from Arrhenius plot. 25 Fig. 4.b.6 Cole-Cole plot of Ba2EuMoO6. 26 Fig. 4.c.1 X-ray diffraction pattern of the Ba2GdMoO6 compound with Miller indices of the peaks. 29 Fig. 4.c.2 ε’-T of Ba2GdMoO6. 30 Fig.4.c.3 tanδ- T relation of Ba2GdMoO6. 30 Fig. 4.c.4 Activation energy values of Ba2GdMoO6 from Arrhenius plot. 31 Fig. 4.c.5 Cole-Cole plot of Ba2GdMoO6 . 31 Fig.4.d.1 X-ray diffraction pattern of the Ba2DyMoO6 compound with Miller indices of the peaks. 34 Fig.4.d.2 ε’-T of Ba2DyMoO6. 35 Fig.4.d.3 tanδ -T relation of Ba2DyMoO6. 35 Fig.4.d.4 Activation energy values of Ba2DyMoO6 from Arrhenius plot. 36 Fig.4.d.5 Cole-Cole plot of Ba2DyMoO6. 36 Fig.4.e.1 X-ray diffraction pattern of the Ba2YMoO6 compound with Miller indices of the peaks. 39 Fig.4.e.2 ε’-T of Ba2YMoO6. 40 Fig.4.e.3 tanδ -T relation of Ba2YMoO6. 40 Fig. 4.e.4 Activation energy values of Ba2YMoO6 from Arrhenius plot. 41 Fig. 4.e.5 Cole-Cole plot of Ba2YMoO6. 41 Fig. 4.f.1 X-ray diffraction pattern of the Ba2NdMoO6 compound with Miller indices of the peaks. 44 Fig. 4.f.2 ε’-T of Ba2NdMoO6. 45 Fig. 4.f.3 tanδ-T relation of Ba2NdMoO6. 45 Fig. 4.f.4 Activation energy values of Ba2NdMoO6 from Arrhenius plot. 46 Fig. 4.f.4 Activation energy values of Ba2NdMoO6 from Arrhenius plot. 46 Fig. 4.a.5 Cole-Cole plot of Ba2NdMoO6. 47 List of Tables Table 4.a.1 The lattice constants of the Ba2SmMoO6 compound. 17 Table 4.b.1 The lattice constants of the Ba2EuMoO6 compound. 23 Table 4.c.1 The lattice constants of the Ba2GdMoO6 compound. 29 Table 4.d.1 The lattice constants of the Ba2DyMoO6 compound. 34 Table 4.e.1 The lattice constants of the Ba2YMoO6 compound. 39 Table 4.f.1 The lattice constants of the Ba2NdMoO6 compound. 44 Table.5.1 The ionic radii of rare earth elements 50 Table.5.2 The lattice volume of Ba2ReMoO6 50 Table.5.3 The experimental data of Ba2ReMoO6. 51 | |
dc.language.iso | en | |
dc.title | "Ba2ReMoO6化合物之介電性質研究
(Re = Sm, Eu, Nd, Gd, Dy, Y)" | zh_TW |
dc.title | Dielectric Properties of the Ba2ReMoO6 compounds
(Re = Sm, Eu, Nd, Gd, Dy, Y) | en |
dc.type | Thesis | |
dc.date.schoolyear | 101-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 林金福(King-Fu Lin),張慶瑞(Ching-Ray Chang) | |
dc.subject.keyword | Ba2ReMoO6化合物之介電性質研究,雙鈣鈦礦系統, | zh_TW |
dc.subject.keyword | Dielectric Properties of the Ba2ReMoO6 compounds,Double pervouskite system, | en |
dc.relation.page | 62 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2013-07-29 | |
dc.contributor.author-college | 理學院 | zh_TW |
dc.contributor.author-dept | 物理研究所 | zh_TW |
顯示於系所單位: | 物理學系 |
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