English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 51296/86402 (59%)
造訪人次 : 8167628      線上人數 : 128
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋
    請使用永久網址來引用或連結此文件: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/25025

    題名: Kinetic study of the peritectic transition of a Bi-2223 superconductor
    作者: Yin, S. C.;Kao, H. -C. I.;Wang, C. M.
    貢獻者: 淡江大學化學學系
    日期: 1994-12
    上傳時間: 2013-07-09 15:28:26 (UTC+8)
    出版者: Amsterdam: Elsevier BV * North-Holland
    摘要: The peritectic transition of a Bi-2223 superconductor with a nominal composition of Bi1.7Pb0.3Ca2.4Sr1.6Cu3.6Oy was studied kinetically under different atmospheres and temperature gradients. It was interesting to find that both the peritectic transition and reaction were dependent on the ambient atmosphere. With a nitrogen flow rate of 25 mL/min, the incongruent melting point obtained was increased with heating rates. The peritectic points, Tp, extrapolated to 0 °C/min gradient from the onset and the peak positions of the DSC curves were 794 and 818 °C, respectively. Average ΔHfus integrated from the endothermic DSC peaks was 140 ± 7 kJ/mol with an activation energy of 547 kJ/mol. A weight loss corresponding to 1.6 mol O-atom was observed from the Tp reaction for 1 mol of Bi-2223 superconductor. Under the oxygen atmosphere, the peritectic point obtained from the peak positions was 887 °C and ΔHfus = 67 ± 7 kJ/mol with only 20% O-atom decomposed compared to that under the nitrogen atmosphere. The dTp/d(log O2%) was (21.3±0.6) °C. Thermal stability of Bi-2223 was greatly enhanced under the oxygen atmosphere.
    關聯: Physica C: Superconductivity and its Applications 235-240(PART 1), pp.323-324
    DOI: 10.1016/0921-4534(94)91385-4
    顯示於類別:[化學學系暨研究所] 期刊論文


    檔案 大小格式瀏覽次數



    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回饋