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首页> 外文期刊>Physica, C. Superconductivity and its applications >Growth of faceted 123 crystals in superconductive YBCO/Ag composites fabricated by infiltration-growth method
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Growth of faceted 123 crystals in superconductive YBCO/Ag composites fabricated by infiltration-growth method

机译：渗透生长法制备YBCO / Ag超导复合材料中123晶的生长

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摘要

Growth process and structures of faceted 123 (YBa2Cu3O7-X) crystals fabricated by conventional unidirectional solidification and infiltration-growth method were studied experimentally and numerically to clarify the formation mechanism of the solidification structures of YBCO/Ag composites. Sample size was almost unchanged during the infiltration-growth process, since molten Ba-Cu-O with a small amount of Y and Ag was just infiltrated into pores in pre-sintered porous primary phase: 211 (Y2BaCuO5) with Ag and then it was cooled to grow 123 crystal. Solidified samples had uniform distribution of primary phase and Ag particles in peritectic 123 crystals. The critical transition condition of macrostructures from columnar to equiaxed structures, and the freezing front temperature of 123 crystal during solidification were clarified. The formation processes of macro/micro structure of faceted 123 crystals were simulated, and the results compared with the experimental ones. (c) 2006 Elsevier B.V. All rights reserved.
机译：通过实验和数值研究，研究了常规单向凝固和渗透生长法制备的多晶面123（YBa2Cu3O7-X）晶体的生长过程和结构，以阐明YBCO / Ag复合材料凝固结构的形成机理。在渗透-生长过程中，样品大小几乎没有变化，这是因为具有少量Y和Ag的熔融Ba-Cu-O刚被浸入预烧结的多孔初级相中的孔中：211（Y2BaCuO5）和Ag冷却以生长123晶体。凝固的样品在包晶123晶体中具有均匀分布的初生相和Ag颗粒。阐明了宏观结构从柱状结构到等轴结构的临界转变条件，以及123晶在凝固过程中的凝固前沿温度。模拟了刻面123晶体宏观/微观结构的形成过程，并将结果与​​实验结果进行了比较。 （c）2006 Elsevier B.V.保留所有权利。

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