頁籤選單縮合
題名 | Preparation , Phase Stability and Characterization of Superconductive Cobalt Oxyhydrates= |
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作者 | Liu, C. J.; Liao, C. Y.; Huang, L. C.; Su, C. H.; Hung, W. C.; Neeleshwar, S.; Chen, Y. Y.; Liu, Charlie Chia-jung; |
期刊 | Chinese Journal of Physics |
出版日期 | 20050600 |
卷期 | 43:3(2) 民94.06 |
頁次 | 頁547-555 |
分類號 | 337.472 |
語文 | eng |
關鍵詞 | |
英文摘要 | We have first used the aquesous KMnO₄ solution to de-intercate and oxidize γ-phase of Na₀.₇CoO₂ and successfully form the superconducting phase cobalt oxyhydrates with onset Tc = 3.4 - 4.6 K. It is found that the phase stability of superconducting cobalt oxyhydrate phase is unstable with respect to the ambient humidity and vacuum but is reversible in terms of phase crystallinity. According to the thermogravimetric analyses (TGA) and x-ray diffraction (XRD) patterns, two relatively stable phases can be identified at relatively low temperatures as a result of dehydration of the cobalt oxyhydrate. In this paper, the phase stability of NaxCoO₂•yH₂O obtained using Br₂in acetonitrile solution is also discussed. |
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