National Changhua University of Education Institutional Repository : Item 987654321/14199
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题名: Preparation, Phase Stability and Characterization of Superconductive Cobalt Oxyhydrates
作者: Liu, Chia-Jyi;Liao, C. Y.;Huang, L. C.;Su, C. H.;Hung, W. C.;Neeleshwar, S.;Chen, Y. Y.;Liu, Charlie Chia-jung
贡献者: 物理學系
日期: 2005-06
上传时间: 2012-09-10T06:14:35Z
出版者: 中華民國物理學會
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.
關聯: Chinese Journal of Physics, 43(3): 547-555
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