Abstract
A bidirectional gradient furnace with sample displacement was used for the growth of large MPMG YBCO samples (20×25×45 mm3). The optimization of the macrogranular structure with consequent extension of the central part of the sample, characterized by large aligned domains, was studied. Considering the large cross section of our samples, we studied the combined effects of different pulling rates (R = 0, 0.5, 1 and 2 mm/h) and one or more stages at the beginning of the sample growth on grain nucleation, dimension and orientation. We obtained 20×25×45 mm3 samples with low misoriented extended domains. Moreover we were able to vary their c axis directions from perpendicular to parallel with respect to the sample length.
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