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Process Parameters, Orientation, and Functional Propertie of Melt-Processed Bulk Y-Ba-Cu-O Superconductors

机译:熔融加工的块状Y-Ba-Cu-O超导体的工艺参数,取向和功能特性

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This study compared the microstructure, texturing, and functional properties (critical currents) of YBa_2Cu_3O_(7-x)-based bulk pellets that were prepared by the quench-melt-growth-process (QMGP), melt-textured growth, and conventional solid-state reaction approaches. Using two x-ray diffraction methods, θ-2θ, and rocking curves, we found that the individual grains of two melt-processed pellets exhibited remarkable preferred orientational alignment (best rocking curve width = 3.2°). However, the direction of the preferred orientation among the grains was random. Among the three types of bulk materials studied, the QMGP sample was found to have the best J_c values, ≈ 4500 A/cm~2 at 77K in a field of 2 kG, as determined from superconducting quantum interference device magnetic data.
机译:这项研究比较了YBa_2Cu_3O_(7-x)基团块的微观结构,织构和功能特性(临界电流),这些团块是通过淬火-熔体生长工艺(QMGP),熔体织构生长和常规固体制备的状态反应方法。使用两种X射线衍射方法θ-2θ和摇摆曲线,我们发现两个熔融加工的颗粒的单个晶粒表现出显着的首选取向排列(最佳摇摆曲线宽度= 3.2°)。然而,晶粒中优选取向的方向是随机的。根据超导量子干涉装置的磁数据确定,在研究的三种类型的散装材料中,发现QMGP样品的最佳J_c值在2kG的磁场中在77K时具有≈4500 A / cm〜2。

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