| Y2BaCuO5粒子对顶部籽晶熔融织构YBCO微结构的影响 |
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| 引用本文： | 汪海英,徐克西,杨洋,邱静和,黄参.Y2BaCuO5粒子对顶部籽晶熔融织构YBCO微结构的影响[J].低温物理学报,2006,28(2):130-133. |
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| 作者姓名： | 汪海英 徐克西 杨洋 邱静和 黄参 |
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| 作者单位： | 上海大学物理系,上海,200444 |
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| 基金项目： | 广东省博士启动基金，国家自然科学基金，上海市重点学科建设项目 |
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| 摘 要： | 本文主要研究了Y211相粒子在顶部籽晶熔融织构YBCO块材中的分布及其对材料超导特性的影响.研究发现,在籽晶正下方,YBCO超导块材中的Y211粒子分布呈不均匀性.样品在近籽晶处Y211粒子非常少,从样品顶部到样品底部Y211相粒子的容积率呈增大趋势.由于Y123粒子和Y211粒子热膨胀系数存在差异,这种不均匀性导致了块材内部产生微裂纹,从而降低了磁悬浮力.
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| 关 键 词： | 熔融织构块材 Y211粒子分布 微结构 |
| 收稿时间： | 09 26 2005 12:00AM |
| 修稿时间： | 12 19 2005 12:00AM |
INFLUENCE OF Y 2 BaCuO 5 PARTICLES ON THE MICROSTRUCTURE OF TOP-SEEDED MELT TEXTURED YBCO BULK |
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| Wang Hai-Ying,Xu Ke-Xi,Yang Yang,Qiu Jing-He,Huang Shen.INFLUENCE OF Y 2 BaCuO 5 PARTICLES ON THE MICROSTRUCTURE OF TOP-SEEDED MELT TEXTURED YBCO BULK[J].Chinese Journal of Low Temperature Physics,2006,28(2):130-133. |
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| Authors: | Wang Hai-Ying Xu Ke-Xi Yang Yang Qiu Jing-He Huang Shen |
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| Institution: | Physics Department of Shanghai University, Shanghai 200444 |
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| Abstract: | Growth (MTG) YBCO bulk, as well as its influence on the bulk superconducting properties, were investigated. It was found that the Y-211 particle distribution within the bulk appears in an inhomogeneous character, which present a gradually changed Y-211 particle density from the upper zone near the top-seed, with nearly little Y-211 particles, to the lower part near the bottom of the bulk with a marked Y-211 particles accumulation. Due to the thermal expansion difference for both of the Y-123 bulk and Y-211 particles the micro-cracks in the bulk interior were consequently brought about, which might result in the bulk levitation force degradation observed in our experiments. |
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| Keywords: | MTG YBCO bulk second phase particles distribution microstructure |
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