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- W1952445873 abstract "A monophasic high-Tc superconductor YBa2Cu4O8 with Tc(onsel), 80 K and fine grain size has beeen synthesized under oxygen at 1 bar employing metal-ethandiol/citric acid (EG/CA) polyester complex precursors. In addition to the preparation, we report the results of infrared (IR) spectra, thermogravimetric analysis (TGA), and X-ray diffraction (XRD) relevant to preparation of the YBa2Cu4O8 superconductor. The effect of temperature of preparation and precursor compositions (i.e. EG/CA molar ratio) on the purity and superconductivity of the YBa2Cu4O8 compound was investigated. The temperature dependence of resistivity and normal-state resistivity of the samples varied systematically with the EG/CA ratio in the precursors. Tc(onset) and the width of the superconducting transition for YBa2Cu4O8 samples were determined to be 80 K for all samples and 6 – 9 K, respectively; the latter depended on the corresponding EG/CA ratios in the precursors. The Meissner fraction of YBa2Cu4O8 samples determined from dc magnetization tests was independent of the EG/CA ratio. Polyester precursors can potentially be applied in large-scale preparation of high Tc ceramic-oxide superconductors and superconducting thin films." @default.
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- W1952445873 date "1994-12-01" @default.
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- W1952445873 title "Chemical Synthesis and Characterization of Superconducting YBa2Cu4O8at Ambient Pressure" @default.
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- W1952445873 doi "https://doi.org/10.1002/jccs.199400103" @default.
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