An effective method for avoiding phase formation during sintering and crystallization of the Hg-family superconductors under high gas pressure
| العنوان: | An effective method for avoiding phase formation during sintering and crystallization of the Hg-family superconductors under high gas pressure |
|---|---|
| المؤلفون: | A. Paszewin, H. Szymczak, T. Lada, Andrzej Morawski, H. Marciniak, A. Wisniewski, Kazimierz Przybylski |
| المصدر: | Superconductor Science and Technology. 11:200-206 |
| بيانات النشر: | IOP Publishing, 1998. |
| سنة النشر: | 1998 |
| مصطلحات موضوعية: | Materials science, Annealing (metallurgy), Metallurgy, Metals and Alloys, Sintering, chemistry.chemical_element, Atmospheric temperature range, Condensed Matter Physics, medicine.disease, law.invention, Corrosion, Mercury (element), chemistry, law, visual_art, Materials Chemistry, Ceramics and Composites, visual_art.visual_art_medium, medicine, Ceramic, Electrical and Electronic Engineering, Crystallization, Vapours |
| الوصف: | Here we report a few methods of avoiding formation of the CaHgO 2 phase during annealing and crystallization of mercury based superconducting ceramics. These methods are based on the following principles : rapid temperature raise to pass the temperature range at which CaHgO 2 easily forms, combined temperature and pressure quenching, diluting gas carrier concentration and processing highly reactive fine-grain-size powder made by the sol-gel method. The report is supported with observations made by the XRD, SEM and high-pressure DTA methods. Some of the observed reactions between the crystallized HTS materials and the various crucible materials are reviewed. This is important because processing the mercury based HTS materials encounters problems caused by high reactivity of mercury vapours. It results in limited corrosion resistance of crucibles and substrate plates. The choice of BaZrO 3 is suggested as the corrosion resistant crucible material. |
| تدمد: | 1361-6668 0953-2048 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::d9ea1e99946bdb974c92f21aa95fe9d6 https://doi.org/10.1088/0953-2048/11/2/006 |
| رقم الأكسشن: | edsair.doi...........d9ea1e99946bdb974c92f21aa95fe9d6 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13616668 09532048 |
|---|