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Title: Preparation, Phase Stability and Characterization of Superconductive Cobalt Oxyhydrates
Authors: Liu, Chia-Jyi;Liao, C. Y.;Huang, L. C.;Su, C. H.;Hung, W. C.;Neeleshwar, S.;Chen, Y. Y.;Liu, Charlie Chia-jung
Contributors: 物理學系
Date: 2005-06
Issue Date: 2012-09-10T06:14:35Z
Publisher: 中華民國物理學會
Abstract: 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.
Relation: Chinese Journal of Physics, 43(3): 547-555
Appears in Collections:[Department of Physics] Periodical Articles

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