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首页> 外文期刊>Journal of Materials Research >High-temperature phase relationships for Y_xNd_1-xBa_2Cu_3O-y (0 ≤ x ≤ 0.5) superconductors via containerless processing
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High-temperature phase relationships for Y_xNd_1-xBa_2Cu_3O-y (0 ≤ x ≤ 0.5) superconductors via containerless processing

机译：Y_xNd_1-xBa_2Cu_3O-y（0≤x≤0.5）超导体通过无容器处理的高温相位关系

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摘要

This paper presents the results of drop-tube experiments performed on YydlvBa2Cu3O,, (0 ≤ x ≤ 0.5) to understand some of the effects of partial substitutions of Nd for Y on the phase relationships in these systems at elevated temperatures. Powders from 50 to l00 pm in diameter were processed in pure O_2 at fumace temperatures from l400 to l800 deg. C, every 25 deg. C. The resulting samples were examined microstructurally using scanning electron microscopy, energy dispersive spectroscopy, and optical microscopy. Powder x-ray diffraction was performed for phase identification. It was verified that Nd substitution alters phase selection by introducing at least one new phase and allowing for solidification of the superconducting composition directly from the melt via undercooling to below the peritectic transformation temperature. In addition, solidification pathways are altered for samples processed at temperatures just below the liquidus temperature. Microstructural and x-ray diffraction evidence was used to map the liquidus with increasing Nd substitution. It was found that a minimum in this liquidus occurs at or near the composition Y_0.1Nd_0.9Ba_2Cu_3O_x and at a temperature of 1500 deg. C (±25 deg. C).
机译：本文介绍了在YydlvBa2Cu3O（0≤x≤0.5）上进行的滴管实验的结果，以了解在高温下这些系统中Nd部分置换Y的相关系的一些影响。将直径为50至100 pm的粉末在纯O_2中于1400至800摄氏度的炉膛温度下进行处理。 C，每25度。 C.使用扫描电子显微镜，能量分散光谱和光学显微镜对所得样品进行微观结构检查。进行粉末X射线衍射以鉴定相。已经证实，Nd置换通过引入至少一种新相并允许超导组合物通过过冷直接从熔体固化至包晶转变温度以下而改变相的选择。另外，在刚好低于液相线温度的温度下处理的样品的固化途径也被改变。显微结构和X射线衍射证据被用来绘制Nd取代增加的液相线图。已经发现，该液相线的最小值出现在成分Y_0.1Nd_0.9Ba_2Cu_3O_x处或附近且在1500度的温度下。 C（±25摄氏度）。

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