Amorphization during mechanical grinding of Bi-Pb-Sr-Ca-Cu-O ceramic superconductors |
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| Affiliation: | 1. Department of Inorganic and Physical Chemistry, Solid State and Superconducting Materials Division, Gent University, Krijgslaan 281, B-9000 Gent, Belgium;2. Department of Solid State Physics, Surface Physics Division, Gent University, Krijgslaan 281, B-9000 Gent, Belgium;3. Electron microscopy for materials research, Antwerp University, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium;1. Departments of Dermatology, Medical University of South Carolina;2. Departments of Dermatology, University of Alabama and Birmingham;3. Departments of Dermatology, University of Pennsylvania |
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| Abstract: | The report describes the amorphization occurring during mechanical grinding of a mixture of Bi-HTSC 2223 and 2212 phases. It is shown that the visually determined grain size and the actual crystal size diminish upon grinding. Noticeable amorphization occurs even after only 30 min of grinding. Furthermore, different crystal planes exhibit variable sensitivity towards the amorphization process and the high Tc-phase is more easily affected by this phenomenon than the low Tc-phase in the Bi-system. Identical results were obtained whether the starting composition of the spray dried powder was 2223 or 2234. |
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