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The flux pinning performance of the superconductor is important for the applications of the GdBa2Cu3O7-δ superconductor bulk. To introduce the suitable secondary phase into the GdBa2Cu3O7-δ matrix is an important way to enhance the performance of flux pinning. By using top-seeded melt texture growth process, single domain GdBa2Cu3O7-δ superconductor bulks (20 mm in diameter) doping with different quantities of BaFe12O19 nano-particles (12O19(x=0, 0.2 mol%, 0.4 mol%, 0.8 mol%)+ 10 wt% Ag2O+ 0.5 wt% Pt. The effects of different quantities of BaFe12O19 nano-particles on superconducting properties and microstructure are also investigated. The result shows that the critical current density, JC, with 0.2 mol% BaFe12O19 additions reaches a maximum value in the zero field, which is about 5.5 × 104 A/cm2. And the critical current density JC, almost increases in the whole field compared with those of the undoped bulks. The microstructure and chemical composition of GdBa2Cu3O7-δ bulk with BaFe12O19 nano-particles are implemented by the SEM-EDS technique. It is found that BaFe12O19 nano-particles keeps a similar form to that of the precursor in the final superconductor bulk. The average size of Gd2BaCuO5 particles is reduced from 1.4 μm in the undoped bulk to 0.79 μm in the bulk with 0.2 mol% BaFe12O19 nano-particles. We suggest that BaFe12O19 nano-particles may form effective magnetic flux centers in the bulks, which affects the homogeneous distribution and refinement of Gd2BaCuO5 particles. Therefore, the improvements in the critical current density and the trapped field are observed in the GdBa2Cu3O7-δ bulk with low-level doped content. The superconducting transition temperature TC, can be maintained at around 92.5 K. However, with the addition of 0.4 mol% BaFe12O19 nano-particles, the critical current density and superconducting transition temperature decrease obviously. It indicates that the excessive addition of BaFe12O19 nano-particles may affect the superconductivity properties to reduce the critical current density, JC. The result indicates that the low-level content BaFe12O19 nano-particles can be an effective second phase for the improvement of the GdBa2Cu3O7-δ superconductor bulks, which is very important for the further enhancing the superconducting properties of GdBa2Cu3O7-δ bulks by introducing the flux pinning of nano-particles.
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Keywords:
- GdBa2Cu3O7-δ superconductor bulks /
- top-seeded melt texture process /
- critical current density /
- BaFe12O19 nano-particles
[1] Zhou D F, Izumi M, Miki M 2012 Supercond. Sci. Technol. 25 103001
[2] Werfel F, Floegel U, Rothfeld D R 2012 Supercond. Sci. Technol. 25 014007
[3] Wang Q L 2008 High Magnetic Field Superconducting Magnet (Beijing: Science Press) pp20-70 (in Chinese) [王秋良 2008 高磁场超导磁体科学 (北京: 科学出版社)第20–70页]
[4] Cai Y Q, Yao X, Li G 2006 Acta Phys. Sin. 55 844 (in Chinese) [蔡衍卿, 姚忻, 李刚 2006 55 844]
[5] Inanira F, Yildizb S, Ozturkc K, Celebic S 2013 Chin. Phys. B 22 077402
[6] Cardwell D A, Babu N H, Shi Y H, Iida K 2006 Supercond. Sci. Technol. 197 S510
[7] Babu N H, Reddy E S, Cardwell D A 2003 Supercond. Sci. Technol. 16 L44
[8] Wang M, Yang W M, Zhang X J, Tang Y N, Wang G F 2012 Acta Phys. Sin. 61 196102 (in Chinese) [王妙, 杨万民, 张晓菊, 唐艳妮, 王高峰 2012 61 196102]
[9] Li J W, Yang W M, Wang M, Guo Y X, Zhong L F 2015 J. Supercond. Nov. Magn. 28 1725
[10] Hu S B, Xu K X, Cao Y, Zuo P X, Lian B W 2012 Chin. J. Low Temperature Phys. 34 297 (in Chinese) [胡顺波, 徐克西, 曹越, 左鹏翔, 连博文 2012低温 34 297]
[11] Zhou D F, Izumi M, Fujimoto T, Zhang Y F, Zhou W L, Xu K 2015 IEEE Trans. Appl. Supercond. 25 6800204
[12] Muralidhar M, Sakai N, Murakami M, Hirabayashi I 2008 Appl. Phys. Lett. 92 162512
[13] Xu K, Tsuzuki K, Hara S, Zhou D, Zhang Y F, Murakami M, Nishio-Hamane D, Izumi M 2011 Supercond. Sci. Technol. 24 085001
[14] Guo L P, Yang W M, Guo Y X, Chen L P, Li Q 2015 Acta Phys. Sin. 64 077401 (in Chinese) [郭莉萍, 杨万民, 郭玉霞, 陈丽平, 李强 2015 64 077401]
[15] Wang M, Yang W M, Ma J, Tang Y N, Zhang X J, Wang G F 2012 Sci. Sin.: Phys. Mech. Astron. 42 346 (in Chinese) [王妙, 杨万民, 马俊, 唐艳妮, 张晓菊, 王高峰2012 中国科学: 物理学 力学 天文学 42 346]
[16] Wimbush S C, Durrell J H, Tsai C F, Wang H, Jia Q X, Blamire M G, MacManus-Driscoll J L 2010 Supercond. Sci. Technol. 23 045019
[17] Li B Z, Zhou D F, Xu K, Tsuzuki K, Zhang J C, Izumi M 2014 Physica C 496 28
[18] Zhang Y, Izumi M, Li Y J, Murakami M, Gao T, Liu Y S, Li P L 2011 Physica C 471 840
[19] Chen D X, Goldfarb R B 1989 J. Appl. Phys. 66 2489
[20] Tang Y N, Yang W M, Liang W, Wang M, Zhang X J, Li J W, Wang G F 2012 Chin. J. Low Temperature Phys. 34 211 (in Chinese) [唐艳妮, 杨万民, 梁伟, 王妙, 张晓菊, 李佳伟, 王高峰 2012低温 34 211]
[21] Li P L, Wang Y Y, Tian Y T, Wang J, Niu X L, Wang J X, Wang D D, Wang X X 2008 Chin. Phys. B 17 3484
[22] Zhou D F, Xu K, Hara S, Li B Z, Izumi M 2013 Trans. Nonferrous Met. Soc. China 23 2042
[23] Xu C, Hu A, Sakai N, Izumi M, Hirabayashi I 2006 Physica C 445 357
[24] Muralidhar M, Sakai N, Jirsa M, Murakami M, Hirabayashi I 2008 Appl. Phys. Lett. 92 162512
[25] Koblischka M R, van Dalen A J J, Higuchi T, Yoo S I, Murakami M 1998 Phys. Rev. B 58 2863
[26] Hara S, Zhou D F, Li B Z, Izumi M 2013 IEEE Trans. Appl. Supercond. 23 7200804
[27] Li B Z, Xu K, Hara S, Zhou D F, Zhang Y F, Izumi M 2012 Physica C 475 51
[28] Xu K, Zhou D F, Li B Z, Hara S, Deng Z G, Izumi M 2015 Physica C 510 54
[29] Zhang Y F, Peng L Q, Zhou W L, Zhou X J, Jia L L, Izumi M 2015 IOP Conf. Series: Materials Science and Engineering 87 012077
[30] Zhang Y F, Izumi M, Kimura Y, Xu Y 2009 Physica C: Supercond. Appl. 469 1169
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[1] Zhou D F, Izumi M, Miki M 2012 Supercond. Sci. Technol. 25 103001
[2] Werfel F, Floegel U, Rothfeld D R 2012 Supercond. Sci. Technol. 25 014007
[3] Wang Q L 2008 High Magnetic Field Superconducting Magnet (Beijing: Science Press) pp20-70 (in Chinese) [王秋良 2008 高磁场超导磁体科学 (北京: 科学出版社)第20–70页]
[4] Cai Y Q, Yao X, Li G 2006 Acta Phys. Sin. 55 844 (in Chinese) [蔡衍卿, 姚忻, 李刚 2006 55 844]
[5] Inanira F, Yildizb S, Ozturkc K, Celebic S 2013 Chin. Phys. B 22 077402
[6] Cardwell D A, Babu N H, Shi Y H, Iida K 2006 Supercond. Sci. Technol. 197 S510
[7] Babu N H, Reddy E S, Cardwell D A 2003 Supercond. Sci. Technol. 16 L44
[8] Wang M, Yang W M, Zhang X J, Tang Y N, Wang G F 2012 Acta Phys. Sin. 61 196102 (in Chinese) [王妙, 杨万民, 张晓菊, 唐艳妮, 王高峰 2012 61 196102]
[9] Li J W, Yang W M, Wang M, Guo Y X, Zhong L F 2015 J. Supercond. Nov. Magn. 28 1725
[10] Hu S B, Xu K X, Cao Y, Zuo P X, Lian B W 2012 Chin. J. Low Temperature Phys. 34 297 (in Chinese) [胡顺波, 徐克西, 曹越, 左鹏翔, 连博文 2012低温 34 297]
[11] Zhou D F, Izumi M, Fujimoto T, Zhang Y F, Zhou W L, Xu K 2015 IEEE Trans. Appl. Supercond. 25 6800204
[12] Muralidhar M, Sakai N, Murakami M, Hirabayashi I 2008 Appl. Phys. Lett. 92 162512
[13] Xu K, Tsuzuki K, Hara S, Zhou D, Zhang Y F, Murakami M, Nishio-Hamane D, Izumi M 2011 Supercond. Sci. Technol. 24 085001
[14] Guo L P, Yang W M, Guo Y X, Chen L P, Li Q 2015 Acta Phys. Sin. 64 077401 (in Chinese) [郭莉萍, 杨万民, 郭玉霞, 陈丽平, 李强 2015 64 077401]
[15] Wang M, Yang W M, Ma J, Tang Y N, Zhang X J, Wang G F 2012 Sci. Sin.: Phys. Mech. Astron. 42 346 (in Chinese) [王妙, 杨万民, 马俊, 唐艳妮, 张晓菊, 王高峰2012 中国科学: 物理学 力学 天文学 42 346]
[16] Wimbush S C, Durrell J H, Tsai C F, Wang H, Jia Q X, Blamire M G, MacManus-Driscoll J L 2010 Supercond. Sci. Technol. 23 045019
[17] Li B Z, Zhou D F, Xu K, Tsuzuki K, Zhang J C, Izumi M 2014 Physica C 496 28
[18] Zhang Y, Izumi M, Li Y J, Murakami M, Gao T, Liu Y S, Li P L 2011 Physica C 471 840
[19] Chen D X, Goldfarb R B 1989 J. Appl. Phys. 66 2489
[20] Tang Y N, Yang W M, Liang W, Wang M, Zhang X J, Li J W, Wang G F 2012 Chin. J. Low Temperature Phys. 34 211 (in Chinese) [唐艳妮, 杨万民, 梁伟, 王妙, 张晓菊, 李佳伟, 王高峰 2012低温 34 211]
[21] Li P L, Wang Y Y, Tian Y T, Wang J, Niu X L, Wang J X, Wang D D, Wang X X 2008 Chin. Phys. B 17 3484
[22] Zhou D F, Xu K, Hara S, Li B Z, Izumi M 2013 Trans. Nonferrous Met. Soc. China 23 2042
[23] Xu C, Hu A, Sakai N, Izumi M, Hirabayashi I 2006 Physica C 445 357
[24] Muralidhar M, Sakai N, Jirsa M, Murakami M, Hirabayashi I 2008 Appl. Phys. Lett. 92 162512
[25] Koblischka M R, van Dalen A J J, Higuchi T, Yoo S I, Murakami M 1998 Phys. Rev. B 58 2863
[26] Hara S, Zhou D F, Li B Z, Izumi M 2013 IEEE Trans. Appl. Supercond. 23 7200804
[27] Li B Z, Xu K, Hara S, Zhou D F, Zhang Y F, Izumi M 2012 Physica C 475 51
[28] Xu K, Zhou D F, Li B Z, Hara S, Deng Z G, Izumi M 2015 Physica C 510 54
[29] Zhang Y F, Peng L Q, Zhou W L, Zhou X J, Jia L L, Izumi M 2015 IOP Conf. Series: Materials Science and Engineering 87 012077
[30] Zhang Y F, Izumi M, Kimura Y, Xu Y 2009 Physica C: Supercond. Appl. 469 1169
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