Microstructure and properties of K2O doped superconducting YBa2Cu3O7−x
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K doped YBa2Cu2Ox powders have been obtained by incorporating K2CO3 to previously coprecipitated amorphous hydroxide mixtures. Synthesis was performed at 900‡C and an orthorhombic 1 2 3 phase was the final product. Sintering of isopressed bars was carried out from 920 to 940‡C. K doping up to 5 at % led to the development of dense bodies with good superconducting behaviour. Oxygen pick-up during the cooling step following sintering was well accomplished despite the high density of the samples. Transition temperatures ⩾90 K were measured. Doping above that percentage led to samples with lower density values. The presence of non-superconducting phases, such as CuO and a green phase, was very significant, and suppressed the superconducting transition.
KeywordsOxygen Polymer Microstructure Hydroxide Transition Temperature
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- 8.E. Saiz, R. Torrecillas, S. Aza and J. S. Moya, in “Superconducting Ceramics”, British Ceramics Proceedings, Vol. 40, edited by R. Feer, (Institute of Ceramics, Stoke-on-Trent, 1988) p. 231.Google Scholar