Abstract
We have investigated the fabrication and the superconducting and field trapping properties of large melt-textured Eu–Ba–Cu–O bulk superconductors for the purpose of application as a compact NMR magnet. We successfully fabricated c-axis oriented single-grain bulk samples up to 65 mm in diameter by melt-processing under a low oxygen partial pressure. The samples of 33 and 47 mm diameters could trap magnetic fields of 1.4 and 1.7 T at 77 K, respectively. The position dependence of T c in the sample of 33mm diameter is very small throughout the sample. In 65 mm-sized sample, however, T c and J c lowered in inner region of the sample, leading to lowering of maximum trapped field. Trapped magnetic field was improved with keeping for long time at maximum temperature in melt-processing.
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