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研究生： 王俊智
Wang, Chun-Chih
論文名稱： 添加稀土元素化合物於單晶粒釔鋇銅氧超導體之釘扎效應研究
Study of the Pinning Effect on RE-doped YBCO Superconductor
指導教授： 陳引幹
Chen, In-Gann
學位類別： 碩士
Master
系所名稱： 工學院 - 材料科學及工程學系
Department of Materials Science and Engineering
論文出版年： 2005
畢業學年度： 93
語文別： 中文
論文頁數： 124
中文關鍵詞： 超導 、釔鋇銅氧 、釘扎效應
外文關鍵詞： YBCO, pinning, peak effect, superconductor
相關次數： 點閱：88  下載：1 
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    • 　　由於超導塊材所能擄獲的磁場強度正比於其臨界電流密度(Jc) 性質與單晶粒的尺寸大小。為了提升其應用可能性，主要的研究莫不致力於如何提升其高磁場下的磁通釘扎能力(Flux pinning strength)以及成長更大尺寸的單晶粒超導塊材。

    　　本研究針對Y-Ba-Cu-O超導，添加各種稀土元素化合物，以其添加後與基地相各種不同的反應機制來達到提升Jc的作用。並探討相同添加物，但不同粒徑大小或是不同添加量的影響。

    　　實驗結果顯示，添加1w%~2wt%的CeO2可大幅提升Y-Ba-Cu-O超導的低場Jc，以及些許的高場Jc。而添加微米級的CeO2提升Jc的效果反而比添加奈米級的CeO2的效果還要理想。

    　　另外在添加奈米級Sm或Nd化合物方面，添加0.1wt%Sm2BaCuO5的Y-Ba-Cu-O超導也可得到提升高場Jc的效果。不過在添加Nd化合物方面因為會造成整體超導性質的破壞而無法提升Jc。

    　The magnitude of trapped field within bulk superconductors is proportional to the critical current density and the size of single grain. So it is necessary to improve the flux pinning ability and produce larger sized single grain REBCO, which are both key issues to practical applications.

    　In this study, we focus on the enhancement of Jc value in Y-Ba-Cu-O superconductor by doping various RE(Rare Element) compound to react with matrix phase. And then we search for the optimum doping amount and particle size with these additions.

    The results reveal that doping 1w%~2wt% CeO2 in Y-Ba-Cu-O sample can enlarge its Jc value substantially under low-field and avoid Jc value descending down rapidly along with the increasing field. And the micro-scale CeO2 can do the more improvement than nano-scale CeO2 do.

    　In the other serious research, we dope nano-scale Sm and Nd compound in Y-Ba-Cu-O superconductor. The results show the 0.1wt%nano-scale Sm211 additions can enhance the Jc value especially under high field. But in the Nd compound doped sample, the Nd atom will replace Ba atom in the superconductive crystal to destroy its superconductivity, which make its Jc value still at the low statement.

    摘要……………………………………………………………………Ι Abstract………………………………………………………………Π 目錄……………………………………………………………………Ⅲ 表目錄…………………………………………………………………III 圖目錄…………………………………………………………………Ⅶ 第一章 緒 論 1 1-1 前 言 1 1-2 銅氧化物超導塊材的研究與應用 2 1-3研究目的 2 第二章 理論基礎與文獻回顧 4 2-1超導體的發展歷程與基礎理論 4 2-1.1 超導體的發展歷程 4 2-1.2超導體特性 6 2-1.3 BCS理論 8 2-1.4 Ginzburg-Landau Theory 9 2-1.5 界面能 (Energy of a Normal Metal-Superconductor Interface) 10 2-1.6超導體的分類 12 2-2 Y-Ba-Cu-O超導材料晶體成長 16 2-2.1 熔融織構製程 16 2-2.2 熔融製程基本原理 18 2-2.3 123晶體成長模式 18 2-3 RE-Ba-Cu-O高溫超導體 (RE=rare earth element) 21 2-3.1 晶體結構 21 2-3.2 RE-Ba-Cu-O系統相圖 22 2-3.3 RE-Ba-Cu-O系統超導特性 23 2-4 單晶粒Y-Ba-Cu-O熔融製程 25 2-4.1 初始化學成份的影響 27 2-5 臨界電流密度的提升 28 2-5.1 臨界電流密度(critical current density)定義 28 2-5.2 渦旋線的釘扎(pinning of vortex) 28 2-5.3 缺陷的引入 30 2-5.4 非超導相（Y211）的釘扎性能 31 2-5.5 非超導相的細化 31 2-5.6 場制釘扎中心的引入 33 2-6 Scaling law與釘扎機制 34 2-6.1 釘扎力量(Pinning force)定義 35 2-6.2 釘扎中心(Pinning center)分類 35 2-6.3 Pinning Functions 36 第三章 實驗方法及步驟 69 3-1 實驗材料 69 3-2實驗流程 69 3-2.1 奈米前驅物(RE2BaCuO5[RE：Sm, Nd] )之製備 69 3-2.2 頂端接種熔融製程(TSMG, Top-seeded melt-textured growth) 70 3-3 性質分析 72 3-3.1 粉末之熱性質分析 72 3-3.2 相成分之鑑定 72 3-3.3 微結構觀察 72 3-3.4 超導性能的量測 73 3-4儀器設備 73 第四章 實驗結果 79 4-1起始粉末合成結果 79 4-2添加CeO2對YBCO超導體之微結構及超導性質之影響 81 4-2.1 添加不同粒徑CeO2對YBCO超導體之微結構及超導性質之影響 82 4-2.1.1 CeO2與前軀YBCO粉末之粒徑差異影響 83 4-2.1.2 Push /Trap effect對奈米級添加物的影響 84 4-3 添加奈米Nd422對YBCO超導體超導性質之影響 87 4-4 添加奈米Sm化合物對YBCO超導體超導性質之影響 88 4-4.1 奈米Sm211的添加 88 4-4.2 奈米Sm2O3的添加 90 第五章 結論 113

    1. M. Tomita, M. Murakami, “High – temperature superconductor bulk magnets that can trap magnetic fields of over 17 tesla at 29K” Nature Vol.42, Jan 30 (2003) 517-520
    2. M.K. Wu, J.R. Ashburn, C.J. Torng, P.H. Hor, R.L. Meng, L. Gao, Z.J. Huang, Y.Q. Wang and C.W. Chu, “Superconductivity at 93K in a New Mixed-phase Y-Ba-Cu-O“Compound System at Ambient Pressure” Phys. Rev. Lett. 58 (1987) 908.
    3. Jun Nagamatsu, Norimasa Nakagawa, Takahiro Muranaka, Yuji Zenitani and Jun Akimitsu, “Superconductivity at 39K in magnesium diboride” Nature 410, (2001) 63-64.
    4. Katsuya Shimizu, Hiroto Ishikawa, Daigoroh Takao, Takehiro Yagi and kiichi Amaya.“Superconductivity in compressed lithium at 20 K” Nature 419, (2002) 597 - 599.
    5. M. Cyrot and D. Pavuna, “Introduction to Superconductivity and High-Tc Materials”,World Scientific, (1992).
    6. M. Tinkham, “Introduction to Superconductivity”, McGraw-Hill, Inc. 1996
    7. C. P. Bean, “Magnetization of High-Field Superconductors” Rev. Mod. Phys. 36 (1964) 31
    8. S. Jin, T.H. Tiefel, R.C. Sherwood, M.E. Davis, R.B. van Dover, G.W. Kammlott, R.A. Fastnacht and H.D. Keith, “High critical currents in Y-Ba-Cu-O superconductors”Appl. Phys.Lett. 52 (1988) 2074
    9. 陳引幹 ”超導塊狀材料及其應用”, 金重勳編, 磁性技術手冊第三十章,中華民國磁性技術協會出版,民國九十一年七月。
    10. K. Salama, B. Selvamanickam, L. Gao and K. Sun, “High current density in bulk YBa2Cu3Ox superconductor” Appl. Phys. Lett., 54 (1989) 2352.
    11. H. Hojaji, K.A. Michael, A. Barkatt, A.N. Thorpe, F.W. Matthew, I.G. Talmy, D.A Haught and S. Alterescu, “A comparative study of sintered and melt-grown recrystalized YBa2Cu3Ox” J. Mater. Res., 4 (1989) 28
    12. C. Varanasi and P.J. McGinn, “Effect of YBa2Cu3O7-x grain size on the nucleation of Y2BaCuO5 during melt texturing” Mater. Lett., 17 (1993) 205.
    13. M. Murakami, M. Morita, K. Doi, and M. Miyamoto, “A New Process with the Promise of High Jc in Oxide Superconductors” Jpn. J. Appl. Phys. Part 2 28 (1989) 1189.
    14. H. Fujimoto, M. Murakami, S. Gotoh, N. Koshizuka and S. Tanaka, Advances in Superconductivity Ⅱ(1990) 285.
    15. Z. Lian, Z. Pingxian, J. Ping, W. Keguang, W. Jingrong and W. Xiaozu, “The properties of YBCO superconductors prepared by a new approach: the powder melting process” Supercond. Sci. Technol. 3 (1990) 490.
    16. Z. Lian, Z. Pingxian, J. Ping, W. Keguang, W. Jingrong and W. Xiaozu, “High Jc YBCO superconductors Prepared by the “Powder Melting Process”” IEEE Trans Mag. 27 (1991) 912.
    17. M. Morita, S. Takebayashi, M. Tanaka and K. Kimura, “Quench and Melt Growth (QMG) Process for Large Bulk Superconductor Fabrication“ Adv. Supercond., 3 (1991) 733.
    18. K. Sawano, M. Morita, M. Tanaka, T. Sasaki, K. Kimura, S. Takebayashi, M. Kimura and K. Miyamoto, “High Magnetic Flux Trapping by Melt-Grown YBaCuOSuperconductors” Jpn. J. Appl. Phys., 30 (1991) L1157.
    19. X. Chaud, D. Isfort, E. Beaugnon and R. tournier, “Isothermal growth of large YBa2Cu3O7-x single domains up to 93mm”. Physica C 341-348, (2000) 2413-2416.
    20. T. Izumi and Y. Shiohara, “Growth mechanism of YBa2Cu3Oy superconductorsprepared by the horizontal Bridgeman method”, J. Mat. Res. 7 (1992) 16
    21. Y. Shiohara, A. Endo, “Crystal growth of bulk high-Tc superconducting oxide materials”. Materials Science and Engineering, R19, No1-2 (1997) 1-81.
    22. M. Murakami, Melt Processed High-Temperature Superconductors, World Scientific,1992.
    23. R.J. Cava, B. Batlogg, C.H. Chen, E.A. Rietman, S.M. Zahurak and D. Werder,“Oxygen stoichiometry, superconductivity and normal-state properties of YBa2Cu3O7-δ” Nature 329 (1987) 423.
    24. Y. Shiohara, A. Endo, “Crystal growth of bulk high-Tc superconducting oxide materials”. Materials Science and Engineering, R19, No1-2 (1997) 1-81.
    25. JCPDS-ICDD, PDF-number: 82-2302
    26. JCPDS-ICDD, PDF-number：82-0472.
    27. T. Hatano, A. Matsushita, K. Nakamura, Y. Sakka, T. Matsumoto and K. Ogawa,“Superconducting and Transport Properties of B-Y-Cu-O Compounds-Orthorhombic and Tetragonal phases” Jpn. J. Appl. Phys., 26 (1987) L721.
    28. T. B. Lindemer, J. F. Hunley, J. E. Gates, Jr. A L. Sutton, J. Brynestad, C. R. Hubbard and P. K. Gallagher, “Experimental and thermodynamic study of nonstoichiometry in YBa2Cu3O7-x” J. Am. Ceram. Soc., 72 (1989) 1775
    29. B.J. Lee and D.N. Lee, “THERMODYNAMIC EVALUATION FOR THE Y2O3-bao-cuox system” J. Am. Ceram. Soc., 74 (1991) 78.
    30. R.J. Cava, B. Batlogg, C.H. Chen, E.A. Rietman, S.M. Zahurak and D. Werder,“Oxygen stoichiometry, superconductivity and normal-state properties of YBa2Cu3O7-δ” Nature 329 (1987) 423.
    31. M. Sano, Y. Hayakawa and M. Kumagawa, “The effect of the substitution of Sm for Ba on the superconductor SmBa2Cu3Oy” Supercond. Sci. Technol., 9 (1996) 478-482.
    32. M. Kambara, T. Umeda, M. Tagami, X. Yao, E. A. Goodlin and Y. Shiohara,“Construction of the Quasi-ternary PhaseDdiagram in the NdO1.5BaO-CuOx system in an air atmosphere. Pt.1. equilibrium tie lines in the Nd1+xBa2-xCu3O6+delta solid solution and liquid region” J. Am. Ceram. Soc., 81 (1998) 2116
    33. E. Goodlin, M. Kambara, T. Umeda and Y. Shiohara, “Solubility of neodymium in cooper-rich oxide melts in air and growth of Nd1+xBa2-xCu3Oz solid solution single crystal” Physica C 289 (1997) 37-50
    34. M. Kuznetsov, C. Krauns, Y. Nakamura, T. Izumi and Y. Shiohara, “Ternary phase diagram of SmO1.5-BaO-CuOy system for melt processing” Physica C 357-360 (2001) 1068-1072.
    35. M. Murakami, N. Hayashi, N. Sakai, S. Ozawa, N. Chikumoto, “Melt Processed of LRE-Ba-Cu-O Superconductors” Advances in Superconductivity IX Vol. 2 (1997), Springer-Verlag, Tokyo, 663-668
    36. N. Chikumoto, J. Yoshioka, M. Otsuka, N. Hayashi and M. Murakami, “Effect of high-temperature heat-treatment on the pinning properties of melt-textured Nd123”Physica C 281 (1997) 253-259
    37. Hu, X. Obradors, V. Gomis, T. Puig, A. Carrillo, E. Cardellach, E. Mendoza, Z. X. Zhao, and J. W. Xiong, “Fabrication of melt-textured Nd123 superconductors with Nd2BaO4 addition” Applied Supercond. Vol. 6 (1998) 129-137
    38. H. Fujimoto, C. Cai and E. Ohtabara, “Sm-Ba-Cu-O bulk superconductors melt-processed in air” Physica C 372-376 (2002) 1111-1114.
    39. Shu-Hau Hsu, In-Gann Chen and Maw-Kuen Wu, “Preparation of c-oriented Nd-Ba-Cu-O/Ag melt-growth sample in air” Supercond. Sci. Technol. 15 (2002) 653-659.
    40. Y.A. Jee, G.W. Hong, C.J. Kim and T.H. Sung, “Dissolution of SmBa2Cu3O7-y seed crystals during top-seeded melt growth of YBa2Cu3O7-y” Supercond. Sci. Technol. 11 (1998) 650-658.
    41. S.I. Yoo, N. Sakai, H. Kojo, S. Takebayashi, N. Hayashi, M. Takahashi, K. Sawada, T. Higuchi and M. Murakami, “Progress in melt processing of Nd-Ba-Cu-O superconductors” IEEE Transaction on Applied Superconductivity, vol.7 No.2 June 1997.
    42. C. Cai, K. Tachibana and H. Fujimoti, “Study of single-domain growth of Y1.8Ba2.4Cu3.4Oy/Ag by using Nd123/MgO thin film as seed” Supercond. Sci. Technol. 13 (2000) 698-702.
    43. C. Cai and H. Fujimoto, “Effects of Nd123/MgO thin film and MgO single-crystal seeds in isothermal solidification of YBaCuO/Ag” J. Mater. Res., Vol. 15, No. 8, Aug (2000).
    44. C. Cai, H. Mori, H. Fujimoto, H. Liu, S. Dou, “Crystal growth patterns in MgO seeded Y1.8Ba2.4Cu3.4Oy/Ag melt-texturing process” Physica C 357-360 (2001) 734-737.
    45. C. Cai and H. Fujimoto, “Stable production of large single-domain Y1.8Ba2.4Cu3.4Oy/Ag by isothermal solidification” Physica C 357-360 (2001) 709-712.
    46. H. Fujimoto, H. Ozaku, E. Ohtabara, “Sm-Ba-Cu-O bulk superconductors melt processed in air using Nd123/MgO thin film cold seeding” Physica C 386 (2003) 198-201.
    47. C. Cai and H. Fujimoto, “Stable production of large single-domain Y1.8Ba2.4Cu3.4Oy/Ag by isothermal solidification” Physica C 357-360 (2001) 709-712.
    48. M. Murakami, Melt Processed High-Temperature Superconductors, World Scientific,1992.
    49. J. Karpinski, E. Kaldis, E. Jilek, S. Rusiecki and B. Bucher, “Bulk synthesis of the81-K superconductor YBa2Cu4O8 at high oxygen pressure” Nature 336, (1988) 660
    50. R. Ramesh, S. Jin, S. Nakahara and T. H. Tiefel, “Phase decomposition and structuraldefects in a Y-Ba-Cu-O superconductor” Appl. Phys. Lett. 57, 1458 (1990)
    51. C. J. Kim, Y.A. Jee, S. C. Kwon, T. H. Sing and G. W. Hong. “Control of YBCOgrowth at the compact/substrate interface by bottom seeding and Yb2O3 coating in seeded melt-growth processed YBCO oxides using a MgO substrate” Physica C 315 (1999) 263-270.
    52. J. Mannhart, D. Anselmetti, J. G. Bednorz, Ch. Gerber, K. A. Muller and D. G. Schlom ,Proc. 6th Int. Workshop on Critical Currents in High-Tc Supercond., Cambridge, UK (1991) 5242
    53. M. Murakami, “Key issues for the characterization of RE-Ba-Cu-O systems (RE:Nd, Sm, Eu, Gd)” Applied Superconductivity Vol.6, No.2-5 (1998) 51-59.
    54. T. Wu, T. Egi, R. Itti, K. Kuroda and N. Koshizuka, Advances in Superconductivity VIII (1996) 481
    55. L. Civale, A.D. Marwick, T.K. Worthington, M.A. Kirk, J.R. Thompson, L. Krusin-Elbaum, Y. Sun, J.R. Clem, and F. Holtzberg, “Vortex confinement by columnar defects in YBa2Cu3O7 crystals: Enhanced pinning at high fields and temperatures” Phys. Rev. Lett., 67 (1991) 648
    56. G. Chen, J. Liu, R. Weinstein, R. Shaw, Advances in Superconductivity IX, Editors, S. Nakajima, M. Murakami, (Springer-Verlag Tokyo) (1997) 657
    57. R. Weinstein, R. P. Sawh, D. Parks, M. Murakami, T. Mochida, N. Chikumoto, G. Krabbes, and W. Bieger, “Very high values of Jc obtained in NdBa2Cu3Ox by use of the U/n process” Physica C 383 (2002) 214-222
    58. V. Selvamanickam, M. Mironova, and K. Salama, “Enhancement of critical currentdensity in YBa2Cu3Ox superconductor by mechanical deformation” J. Mater. Res. Vol.8 (2) (1993) 249
    59. M. Mironova, V. Selvamanickam, D. F. Lee, and K. Salama, “TEM studies ofdislocations in deformed melt-textured YBa2Cu3Ox superconductors, “ J. Mater. Res.Vol. 8 (11) (1993) 2767
    60. P. Yang and C. M. Lieber, “Nanorod-Superconductor Composites: A Pathway to,Materials with High Critical Current Densities” Science 273 p1836 (1996)
    61. Z. L. Wang, A. Goyal, and D. M. Kroeger, “Structural and chemical disorder near the Y2BaCuO5/YBa2Cu3O7-δ interface and its possible relation to the flux-pinning behavior in melt-textured YBa2Cu3O7-δ” Physical Review B Vol. 47, 5373-5382 (1993)
    62. M. Mironova, D. F. Lee and K. Salama, “TEM and critical current density studies of melt-textured YBa2Cu3Ox with silver and Y2BaCuO5 additions” Physica C 211 p188 (1993)
    63. S. Pinol, F. Sandiumenge, B. Martinze, V. Gomis, J. Fontcuberta, and X. Obradors, “Enhanced critical currents by CeO2 additions in directionally solidified YBa2Cu3O7”Appl. Phys. Lett. 65(1994) 1448
    64. C-J. Kim, K-B. Kim, D-Y. Won, H-C. Moon, D-S. Suhr, S. H. Lai, and P. J. McGinn, “Formation of BaCeO3 and its influence on microstructure of sintered/melt-textured Y-Ba-Cu-O oxides with CeO2 addition” J. Mater. Res. 9 (1994) 1952
    65. P. J. Mcginn, T. Meugnan, S. Yeung and A. Banerjee, “Improved Flux Pinning in Melt Textured YBa2Cu3O7-δ Through Chemical Additions” Applied Superconducitivity Vol. 4, Nos 10-11, pp. 563-575 (1996)
    66. G. Karabbes, G. Fuchs, P. Schatzle, S. Grub. J. W. Park, F. Hardinghaus, G. Stover, R. Hayn, S. -L. Drechsler, T. Fahr, “Zn doping of YBa2Cu3O7 in melt textured materials: peak effect and high trapped fields” Physica C 330 (2000) 181-190
    67. G. K. Bichile, D. G. Kuberkar, Smita Deshmukh, R. G. Kulkarni, M. A. Abdeigadirand P. Boolchand, “Enhanced flux pinning by Zn substitution in YBa2Cu3O7- δ Supercond. Sci. Technol. 4 (1991) 57-61
    68. M. Hussain, S. Kuroda and K. Takita, “Peak effect observed in Zn doped YBCO singlecrystals” Physica C 297 (1998) 176-184
    69. G. Kozlowski and T. Svobodny, “Stability of growing front of YBa2Cu3Ox superconductor in the presence of Pt and CeO2 additions” Appl. Phys. Lett. 67 (1995) 288
    70. N. Sakai, S. I. Yoo and M. Murakami, “Control of Y2BaCuO5 size and morphology in melt-processed YBa2Cu3O7-δ superconductor” J. Mater. Res., Vol.10, No.7, Jul (1995)
    71. N. Ogawa, I. Hirabayashi and S. Tanaka, “Preparation of a high-Jc YBCO bulk superconductor by the platinum doped melt growth method” Physica C 177 (1991) 101.
    72. M. Matsui, N. Sakai, S. Sakai, S. J. Seo, and M. Murakami, “Effects of Pt and CeO2 addition on the growth of Nd4Ba2Cu2O10 particles” Supercond. Sci. Technol. 13 (2000) 660
    73. M. Muralidhar, M. R. Koblischka, and M. Murakami, “(Nd, Eu, Gd)-Ba-Cu-O superconductors with combined addition of CeO2 and Pt” Supercond. Sci. Technol. 13 (2000) 693
    74. L. Zhou, S. K. Chen, K. G.. Wang, X. Z. Wu, P. X. Zhang and Y. Feng, “Synthesis of ultrafine Y2BaCuO5 powder and its incorporation into YBCO bulk by powder meltingprocess” Physica C 363 (2001) 99-106.
    75. Wang, Y. Bugoslavsky, A. Berenov, L. Cowey, A. D. Caplin, L. F. Cohen, J. L.MacManus Driscoll, L. D. Cooley, X. Song, and D. C. Larbalestier, “High criticalcurrent density and improved irreversibility field in bulk MgB2 made by a scaleable,nanoparticle addition route” Appl. Phys. Lett. 81 (2002) 2026
    76. Christova, A. Manov, J. Nyhus, U. Thisted, O. Herstad, S. E. Foss, K. N. Haugen,K. Fossheim, “Bi2Sr2CaCu2Ox bulk superconductor with MgO particles embedded” J.Alloys and Comp. 340 (2002) 1-5
    77. Hua, J. Yoo, J. H. Kim, H. Chung, and G. Qiao, “Microstructure and phaseevolution of ultrafine MgO doped Bi-2223/Ag tapes” Physica C 291 (1997) 149-154
    78. Muralidhar, M. Jirsa, N. Sakai, and M. Murakami, “Progress in melt-processed (Nd-Sm-Gd)Ba2Cu3Oy superconductors” Supercond. Sci. Technol. 16 (2003) R1-R16
    79. Muralidhar, N. Sakai, M. Nishiyama, M. Jirsa, T. Machi, and M. Murakami,“Pinning characteristics in chemically modified (Nd, Eu, Gd)-Ba-Cu-O superconductors” Appl. Phys. Lett. Vol. 82 (2003) 943
    80. M. Muralidhar and M. Murakami, “Effect of Eu2BaCuO5 addition on the matrix composition and flux pinning in (Nd0.33Eu0.33Gd0.33)Ba2Cu3Oy superconductors”Supercond. Sci. Technol. 13 (2003) 1587
    81. Das, M. R. Koblischka, N. Sakai, M. Muralidhar, S. Koishikawa, T. Fukuzaki, S. J. Seo, and M. Murakami, “Magnetic and magnetic-optic characterization of the ternary compounds (Nd0.33Eu0.33Gd0.33)Ba2Cu3Oy, (Sm0.33Eu0.33Gd0.33)Ba2Cu3Oy and(Nd0.33Sm0.33Gd0.33)Ba2Cu3Oy” Supercond. Sci. Technol. 11 (1998) 1283
    82. Das, M. Muralidhar, M. R. Koblischka, and M. Murakami, “Magneto-optic and magnetic properties of (Nd0.33Eu0.33Gd0.33)1-xYxBa2Cu3Oy superconductors” Physica C 338 (2000) 284-290
    83. M. R. Koblischka and M. Murakami, “Pinning mechanisms in bulk high-Tc superconductors” Supercond. Sci. Technol. 13 (2000) 738-744
    84. W.J.Zhu,P.Liu andZ.X.Zhao Phisca C 199 (1992) P285~288
    85. Ping-Chi Hsieh, Shih-Yun Chen, In-gann Chen, and Maw-Kuen Wu, Flux Pinning at High Magnetic Field in Melt Processed SmBa2Cu3O7 with nanocrystalline Sm211/Nd422 additives, Superconduting Science and Technology. 18(2005) S111~S118
    86. W. A. Fietz and W. W. Webb, “Hysteresis in Superconducting Alloys—Temperature and Field Dependence of Dislocation Pinning in Niobium Alloys” Phys. Rev.,178 (1969) 657
    87. D. Dew-Hughes, “Flux pinning mechanisms in type II superconductors” Philos. Mag. 30, (1974) 293.
    88. R. P. Huebener, “Magnetic Flux Structures in Superconductors” Springer-Verlag Berlin Heidelberg New York (1979)
    89. C.J. Kim, K.B. Kim, G.W. Hong, D.Y. Won, B.H. Kim, C.T. Kim, H.C. Moon, and D.S. Suhr, Microstructure, microhardness, and superconductivity of CeO2 -added Y¬Ba¬Cu¬O superconductors, J. Mater. Res. 7, (1992)2349
    90. S. Pinol and F.Sandiumemge. Enhanced critical currents by CeO2 additions in directionally solidified YBa2Cu3O7, Appl. Phys. Lett. 65 (11) (1994) 1448
    91. J.D. Riches, J.A. Alarco and J.C. Barry, Effects of PtO2 and CeO2 additives on the microstructures of the quenched melts of Y–Ba–Cu–O materials Physica C 336 (2000) 43-56
    92. M.Murakami. Processing of bulk YBaCuO, Supercond. Sci. Technol. 5 (1992) 185
    93. S.k. Chen, L. Zhou, K.G. Wang, X.Z. Wu, P.X. Zhang, Y. Feng, Refinement mechanism of CeO2 addition on Y2BaCuO5 particles in PMP YBCO bulks , Physica C 336 (2002) 190-94

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