Abstract
Technological exploitation of the recently discovered high-Tc superconducting oxides requires processing the materials at modest temperatures. A first step toward this goal is the synthesis of the material in small particle size. This requires, in turn, the design of a synthetic route at temperatures below those where sintering takes place. Here we report the preparation of YBa2Cu3O7–δ as small particles by firing the coprecipitated oxalates at temperatures T ≤780°C; sintering begins above 800°C. Properties of the materials depend on the highest temperatures reached. As noted independently by Torardi et al.1, low-temperature synthesis in air results in a tetragonal, semiconducting product rather than the orthorhombic, superconducting phase. Therefore we also report a low-temperature (T<780 °C) method of converting the tetragonal phase to the superconducting phase without sintering of the small particles
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References
Torardi, C. C. et al. Chemistry of High-Temperature Superconductors, ACS Symposium Series 351 (eds Nelson, D. L., Whittingham, M. S. & George, T. F.) 152–163 (Am. Chem. Soc., Washington DC, 1987).
Manthiram, A., Swinnea, J. S., Sui, Z. T., Steinfink, H. & Goodenough, J. B. J. Am. chem. Soc. (in the press).
Gallagher, P. K., O'Bryan, H. M., Sunshine, S. A. & Murphy, D. W. Mater. Res. Bull. 22, 995–1006 (1987).
Tarascon, J. M. et al. Proc. Int. Workshop on Novel Mechanisms of Superconductivity Berkeley, 22–26 June, 1987 (in the press).
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Schüller, I. K. et al. Proc. Int. Workshop on Novel Mechanisms of Superconductivity Berkeley, 22–26 June, 1987 (Plenum, New York, in the press).
Goodenough, J. B. (in preparation).
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Manthiram, A., Goodenough, J. Synthesis of the high-Tc superconductor YBa2Cu3O7–δ in small particle size. Nature 329, 701–703 (1987). https://doi.org/10.1038/329701a0
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DOI: https://doi.org/10.1038/329701a0
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