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A contribution to the study of the Hg-Ba-Cu-O system

机译:对Hg-Ba-Cu-O系统研究的贡献

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This work aims to contribute to the study of the Hg-Ba-Cu-O diagram. Generally, we can see that high-temperature superconductor phase diagrams are far from complete. Of these, the Hg-Ba-Cu-O diagram is very interesting owing to the high mercury fugacity. However, to study this diagram it is necessary to control both the mercury and the oxygen activities. The importance of this check is evident in the preparation of single-phase samples, where competitive phases are often obtained; knowledge of these phases will provide an improvement. Even the famous superconductor phase HgBa2CuO4+delta is still the subject of discussion. To study these compounds, thermogravimetric and differential thermal analyses, X-ray diffractometry, scanning electron microscopy and oxygen titration are the most important analyses. In particular, we applied the well known effusion technique, a programmed decomposition by the saturated vapour method, rarely used for this purpose. [References: 21]
机译:这项工作旨在促进Hg-Ba-Cu-O图的研究。通常,我们可以看到高温超导体相图还远远不够完整。其中,由于汞逸度高,Hg-Ba-Cu-O图非常有趣。但是,要研究该图,必须同时控制汞和氧气的活性。这种检查的重要性在单相样品的制备中很明显,因为在单相样品中经常会获得竞争相。这些阶段的知识将提供改进。甚至著名的超导体相HgBa2CuO4 +δ仍然是讨论的主题。要研究这些化合物,最重要的分析是热重分析和差热分析,X射线衍射仪,扫描电子显微镜和氧滴定。特别是,我们应用了众所周知的喷射技术,即通过饱和蒸气法进行程序分解,很少用于此目的。 [参考:21]

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