Abstract
Carbon retention is found to deteriorate dramatically the superconducting properties of Y-123 ceramics. This work examines the way in which carbon is distributed in samples prepared according to two different methods: conventional sintering and melt texturing. The high-resolution electron microscopy nanostructural study establishes clearly that in a carbon-contaminated sample carbonate groups are located in the 123 matrix, substituting partly the copper polyhedra; a direct correlation between the carbon content and the characteristics of the superconducting transition is made. It is shown that the carbon content in the precursor prior to the melt texturing process has a great influence on the quality of the textured sample. The addition of a small amount of platinum is shown to be very effective in decreasing the carbon content in melt-textured samples so that their superconducting properties can be optimized.
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