Abstract
Effects of a slight compositional change on the microstructure of sintered Y‐Ba‐Cu‐O superconducting ceramics were investigated. The compositional change was provided either by the liquid which has been formed at the hot end of the rectangular bar specimen sintered under gradient temperature or by the vapor from Y‐Ba‐Cu‐O melt. The results indicated that the Cu and Ba vapor pressure of the sintering atmosphere must be closely controlled to obtain an enhanced densification and a desired single‐phase microstructure.
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