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首页> 外文期刊>Journal of Superconductivity >Effect of processing parameters on the superconductivity of HgO added Y-123 compound
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Effect of processing parameters on the superconductivity of HgO added Y-123 compound

机译：工艺参数对HgO添加Y-123化合物超导性的影响

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摘要

The superconducting properties of the Y-123 superconductors are very sensitive to the oxygen content and therefore requires oxygen annealing. Alternatively, the oxygen content can be optimized by using some material as an internal source of oxygen. The present study was undertaken to illuminate the effect of HgO addition in Y-123 superconductors, synthesized at different temperatures under variant conditions. Polycrystalline samples of Y123 were synthesized with nominal composition YBa{sub}2Cu{sub}3O{sub}(7-x) adding 30% weight of HgO. The X-ray diffraction patterns of all the samples revealed monophasic Y-123 nature without any trace of Hg. A sharp transition at 90 K was observed in the samples treated at 950℃, 960℃, and 975 ℃, although these were annealed without oxygen flow. The scanning electron micrographs of these samples showed uniform grain size with substantial grain inter-diffusion. The significant role played by the HgO is to provide oxygen ambient through its decomposition. Thus, Y-123 samples with 90 K transition can be prepared without oxygen annealing.
机译：Y-123超导体的超导特性对氧含量非常敏感，因此需要氧退火。或者，可以通过使用某些材料作为内部氧气源来优化氧气含量。进行本研究以阐明在不同条件下在不同温度下合成的Y-123超导体中HgO添加的影响。合成Y123的多晶样品，其标称组成为YBa {sub} 2Cu {sub} 3O {sub}（7-x），添加30％重量的HgO。所有样品的X射线衍射图显示出单相Y-123性质，没有任何痕量的汞。尽管在没有氧气流的情况下进行了退火，但在950℃，960℃和975℃处理的样品中，在90 K处观察到了急剧的转变。这些样品的扫描电子显微照片显示出均匀的晶粒尺寸以及大量的晶粒相互扩散。 HgO的重要作用是通过其分解提供氧气环境。因此，可以在没有氧退火的情况下制备具有90 K跃迁的Y-123样品。

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