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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 林昭吟,陳政弦 | |
| dc.contributor.author | Mei-Chung Lin | en |
| dc.contributor.author | 林美君 | zh_TW |
| dc.date.accessioned | 2021-06-13T00:20:58Z | - |
| dc.date.available | 2007-07-30 | |
| dc.date.copyright | 2007-07-30 | |
| dc.date.issued | 2007 | |
| dc.date.submitted | 2007-07-27 | |
| dc.identifier.citation | [1] T. C. Han and J. G. Lin, J. Magn. Mater., 304 (2006) e424
[2] W. Prellier, M. P. Singh, and P. Murugavel, J. Phys.: Condens. Matter, 17 (2005) R803 [3] http://www.ncnr.nist.gov/staff/jeff/Multiferroics.html [4] H. Sugie, N. Iwata, and K. Kohn, J. Phys. Soc. Jpn., 71 (2002) 1558 [5] Z. J. Huang, Y. Cao, Y. Y. Sun, Y. Y. Xue, and C. W. Chu, Phys. Rev. B 56 (1997) 2623 [6] A. Munoz, J. A. Alonso, M. J. Martinez-Lope, M. T. Casais, J. L. Martinez, and M. T. Fernandez-Diaz, Phys. Rev. B 62 (2000) 9498 [7] C. dela Cruz, F. Yen, B. Lorenz, Y. Q. Wang, Y. Y. Sun, M. M. Gospodinov, and C. W. Chu, Phys. Rev. B 71 (2005) 060407 [8] P. A. Sharma, J. S. Ahn, N. Hur, S. Park, S. –B. Kim, S. Lee, J. –G. Park, S. Guha, and S. –W. Cheong, Phys. Rev. Lett. 93 (2004) 1770202 [9] M. Fiebig, Th. Lottermoser, D. Frohlich, A. V. Goltsev, and R. V. Pisarev, Nature 419 (2002) 818 [10] D. G. Tomuta, S. Ramakrishnan, G. J. Nieuwenhuys, and J. A. Mydosh, J. Phys.: Condens. Matter 13 (2001) 4543 [11] B. F. Woodfield, M. L. Wilson, and J. M. Byers, Phys. Rev. Lett. 78 (1997) 3201 [12] T. Katsufuji, S. Mori, M. Masaki, Y. Moritomo, N. Yamamoto, and H. Takagi, Phys. Rev. B 64 (2001) 104419 [13] I. Munawar and S. H. Curnoe, J. Phys.: Condens. Matter 18 (2006) 9575 [14] N. Iwata and K. Kohn, J. Phys. Soc. Jpn., 67 (1998) 3318 [15] P. Murugavel, J. –H. Lee, D. Lee, and T. W. Noh, et al.: App. Phys. Lett. 90 (2007) 142902 | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/28754 | - |
| dc.description.abstract | 在固態反應合成下，稀土錳氧化物RMnO3 ( R = 稀土元素或釔 )依據R3+ 離子半徑的大小可形成二種晶體結構，分別為：（1）當R為半徑較大的La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy時，則會形成正方結構的RMnO3；（2）當R為半徑較小的Ho、Er、Tm、Yb、Lu、Y，則會形成六方結構的RMnO3。這個研究利用固態反應法備製了一系列六方結構的RMnO3（R = Ho、Er、Tm、Yb、Lu、Y）的樣品，藉由X光繞射儀斷定其結構，繼而測量其磁性、電性和比熱的特性，探討不同R3+離子對於整個化合物的物性影響。
研究發現，在磁性的數據中顯示，只有在YMnO3、YbMnO3和LuMnO3清楚出現了反鐵磁的轉變溫度，分別為73 K、87 K和83 K；而由比熱的量測發現，磁性轉變溫度清楚的反應在比熱的性質中，由比熱的轉變溫度可以歸納出，轉變溫度隨R的離子半徑變小而增高。在介電常數的量測中，發現在所有磁轉變溫度附近都出現不正常的轉折現象，證實磁和電性的強關聯性。综而言之，我們的這個研究提供了重要的實驗數據，有助於未來多磁體的理論發展。 | zh_TW |
| dc.description.abstract | The rare earth manganites RMnO3 (R = rare earth element or Y) exhibit strong magnetic exchange interactions between the magnetic moments of the Mn3+ ions as well as some of the magnetic R3+. Depending on the size of rare earth ion, RMnO3 crystallizes into two different structures：（1） orthorhombic phase for R = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, or Dy which has a larger ionic radius compared with that of Ho；and （2）hexagonal phase for R = Ho, Er, Tm, Yb, Lu or Y which possesses a smaller ionic radius. In this work, we have prepared a series of hexagonal RMnO3 with R = Ho, Er, Tm, Yb, Lu and Y and employed the techniques of X-ray powder diffraction, magnetic susceptibility, heat capacity and dielectric permeability in order to systematically study their R-dependent structural, magnetic and electric properties.
In the data of magnetic susceptibility of these six samples, only YMnO3, YbMnO3 and LuMnO3 show antiferromagnetic transitions near 73 K, 87 K and 83 K respectively. However, the magnetic transition temperatures of all samples are clearly observed in the data of specific heat. It is found that the transition temperature increases with decreasing the radius of R-ion, which is attributed to the enhancement of exchange interaction between Mn3+-ions. In the data of temperature dependent dielectric permeability vs. temperature, anomalies appear near TN in all samples, implying a strong coupling between ferroelectric and magnetic orders in the hexagonal RMnO3 compounds. The results of this study provide important information for the future development of theoretical model for multiferroism. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T00:20:58Z (GMT). No. of bitstreams: 1 ntu-96-R94222069-1.pdf: 3173486 bytes, checksum: b68d7544e3e569dc073653c35f2fbadb (MD5) Previous issue date: 2007 | en |
| dc.description.tableofcontents | Contents
口試委員審定書 i 致謝 ii Abstract (in Chinese) iii Abstract (in English) iv Contents v List of figures vi List of tables viii Chapter 1. Introduction 1 Chapter 2. Experimental 5 2-1 Experiment flow chart 5 2-2 Sample preparation 6 2-3 Measurements 8 2-3-1 Structure analysis 8 2-3-2 Magnetic analysis 8 2-3-3 Specific heat analysis 8 2-3-4 Dielectric analysis 9 Chapter 3. Results and Discussion 10 3-1 Structures of hexagonal RMnO3 10 3-2 Magnetic properties of hexagonal RMnO3 10 3-3 Specific heat properties of hexagonal RMnO3 12 3-4 Dielectric properties of hexagonal RMnO3 14 Chapter 4. Conclusion 17 References 18 List of figures Fig. 1-1 View of the ferroelectric phase from the perpendicular to the c axis, showing the layered nature of the hexagonal RMnO3. 19 Fig. 1-2 Schematic representation of the magnetic structure of YMnO3. 19 Fig. 2-1 X-ray diffraction machine Bruker D8. 20 Fig. 2-2 JEOL 6700 Scanning Electron Microscopy. 20 Fig. 2-3 Superconducting quantum interference device (SQUID) Quantum Design. 21 Fig. 2-4 PPMS (Quantum Design Model 6000). 21 Fig. 2-5 The set-up of thermal relation measurement. (a) view from the side; (b) view from the top. 22 Fig. 2-6 (a) LCR-Meter Agilent 4294A); (b) home-made probe. 22 Fig. 3-1 X-ray diffraction patterns of RMnO3 samples with R= Ho, Er, Tm, Yb, Lu and Y. 23 Fig. 3-2 Lattice parameter of RMnO3 as a function of the size of the rare earth (RE). 23 Fig. 3-3 Scanning electron micrographs of a sintered pellet of HoMnO3 taken at a magnification of 5.000 times. 24 Fig. 3-4 Scanning electron micrographs of a sintered pellet of ErMnO3 taken at a magnification of 2000 times. 24 Fig. 3-5 Scanning electron micrographs of a sintered pellet of TmMnO3 taken at a magnification of 5000 times. 25 Fig. 3-6 Scanning electron micrographs of a sintered pellet of YbMnO3 taken at a magnification of 5000 times. 25 Fig. 3-7 Scanning electron micrographs of a sintered pellet of LuMnO3 taken at a magnification of 5000 times. 26 Fig. 3-8 Scanning electron micrographs of a sintered pellet of YMnO3 taken at a magnification of 5000 times. 26 Fig. 3-9 Inverse susceptibility of HoMnO3 in the zero-field- cooled and the field-cooled. 27 Fig. 3-10 Inverse susceptibility of ErMnO3 in the zero-field- cooled and the field-cooled. 27 Fig. 3-11 Inverse susceptibility of TmMnO3 in the zero-field- cooled and the field-cooled. 28 Fig. 3-12 Inverse susceptibility of YbMnO3 in the zero-field- cooled and the field-cooled. 28 Fig. 3-13 Inverse susceptibility of LuMnO3 in the zero-field- cooled and the field-cooled. 29 Fig. 3-14 Inverse susceptibility of YMnO3 in the zero-field- cooled and the field-cooled. 29 Fig. 3-15 Magnetization isotherms of YMnO3. 30 Fig. 3-16 Magnetization isotherms of TmMnO3. 30 Fig. 3-17 Specific heat v.s. temperature of YMnO3 at zero magnetic field. The solid line is the lattice contribution. 31 Fig. 3-18 Specific heat v.s. temperature of HoMnO3 at zero magnetic field. The solid line is the lattice contribution. 31 Fig. 3-19 Specific heat v.s. temperature of ErMnO3 at zero magnetic field. The solid line is the lattice contribution. 32 Fig. 3-20 Specific heat v.s. temperature of TmMnO3 at zero magnetic field. The solid line is the lattice contribution. 32 Fig. 3-21 Specific heat v.s. temperature of YbMnO3 at zero magnetic field. The solid line is the lattice contribution. 33 Fig. 3-22 Specific heat v.s. temperature of LuMnO3 at zero magnetic field. The solid line is the lattice contribution. 33 Fig. 3-23 Excess specific heat of YMnO3 after subtraction of the lattice contribution. 34 Fig. 3-24 Excess specific heat of HoMnO3 after subtraction of the lattice contribution. 34 Fig. 3-25 Excess specific heat of ErMnO3 after subtraction of the lattice contribution. 35 Fig. 3-26 Excess specific heat of TmMnO3 after subtraction of the lattice contribution. 35 Fig. 3-27 Excess specific heat of YbMnO3 after subtraction of the lattice contribution. 36 Fig. 3-28 Excess specific heat of LuMnO3 after subtraction of the lattice contribution. 36 Fig. 3-29 Temperature dependence of the dielectric constant (ε) of YMnO3. 37 Fig. 3-30 Temperature dependence of the dielectric constant (ε) of HoMnO3. 37 Fig. 3-31 Temperature dependence of the dielectric constant (ε) of ErMnO3. 38 Fig. 3-32 Temperature dependence of the dielectric constant (ε) of TmMnO3. 38 Fig. 3-33 Temperature dependence of the dielectric constant (ε) of YbMnO3. 39 Fig. 3-34 Temperature dependence of the dielectric constant (ε) of LuMnO3. 39 Fig. 3-35 Frequency dependence of the dielectric constant of RMnO3 at room temperature. 40 Fig. 3-36 Frequency dependence of the tanδ of RMnO3 at room temperature. 40 List of table Table 1. Lattice parameters and magnetic transition temperature in RMnO3. 41 | |
| dc.language.iso | en | |
| dc.subject | 六角柱 | zh_TW |
| dc.subject | 稀釷氧化物 | zh_TW |
| dc.subject | 多磁體 | zh_TW |
| dc.subject | hexagonal | en |
| dc.subject | multiferroic | en |
| dc.subject | RMnO3 | en |
| dc.title | 多磁體RMnO3 (R=Ho, Er, Tm, Yb, Lu and Y)的物性研究 | zh_TW |
| dc.title | The study on the physical properties of multiferroic RMnO3 (R=Ho, Er, Tm, Yb, Lu and Y) | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 95-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 張慶瑞,胡崇德 | |
| dc.subject.keyword | 多磁體,稀釷氧化物,六角柱, | zh_TW |
| dc.subject.keyword | multiferroic,RMnO3,hexagonal, | en |
| dc.relation.page | 41 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2007-07-27 | |
| 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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