Abstract
We correlate the critical current performance of thick film second-generationYBa2Cu3O7 (YBCO) coated conductors, made by metal–organic deposition,with specimen grain size. The transport critical current densities,JcT, of these conductors were observed to be inversely proportional to YBCO grain size in the5–40 µm size range. Analysis of magnetic hysteresis curves of the conductors and transmissionelectron microscopy data from a large YBCO grain revealed that the reducedJcT in tapes with large YBCO grain size is due to the accumulation of secondary phaseprecipitates within the grains near the periphery of, and in, the grain boundaries.Grain size is determined to be one of the important factors in determiningJcT of YBCO coated conductors made by the metal–organic processes.
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