頁籤選單縮合
題名 | Scanning Electron Microscopy on a High Temperature Superconducting Y-Ba-Cu-O System |
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作 者 | 鄭秀鳳; 姚永德; | 書刊名 | 材料科學 |
卷期 | 19:3 1987.09[民76.09] |
頁次 | 頁210-215 |
分類號 | 440.33 |
關鍵詞 | |
語文 | 英文(English) |
英文摘要 | Superconductors with high transition temperature (93 K) were prepared by fine ceramicprocessing in a Y-Ba-Cu-O system sintered at 950℃. X-ray diffraction patterns exhibit no obviousdifference in the sintered powder as compared to the calcined one. The average density of the 950℃-sintered ceramic pellets was 3.70 to 3.78 g/cm�� . The microstructural influence on the superconducting effect was examined in detail. Both the grain boundarybetween two adjacent grains and the cavity within the grate interior are yttrium-depleted regions asconceivable from the EDAX spectra. The SEM micrographs of specimen sintered at 1000℃ show plate4ike and neelde-like CuOcrystals. There were Y-depleted precipitates on the surface of the crystals. This sample displays nosuperconductivity. |
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