Abstract
A.C. magnetic susceptibility measurements have been performed on polycrystalline aggregates of Ba 2YCu 3O 7− δ superconducting cuprates ranging in size from 40 μm diameter granules to 3 mm × 3 mm × 5 mm bulk pieces. The susceptibility transition near 90K broadens and becomes progressively shallower for the smaller size aggregates. This phenomenon has been used to follow the consolidation of small aggregates during sintering between 450–950°C in an oxygen atmosphere. Significant consolidation occurs at and above 850°C allowing the possibility of sintering at somewhat lower temperatures than previously anticipated. The influence of atmospheric moisture appears to be minimal.
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