Abstract

The formation of spherical pores and regions free of Y2BaCuO5 (2‐1‐1) has been studied by melt processing Y1.6Ba2.3Cu3.3Ox: in two different atmospheres (air and oxygen). When the sintered Y1.6Ba2.3Cu3.3Ox specimens are melted at 1050°C, many spherical pores form in the melted specimens. During the subsequent cooling, the pores are filled by liquid flow and finally solidified to Y2BaCuO5‐free regions. Melt processing in an oxygen atmosphere produces more pores and regions free of 2‐1‐1 than in air. Because peritectic melting of YBa2Cu3O7‐y in an oxygen atmosphere produces more oxygen gas than that in air, the formation of the pores and Y2BaCuO5‐free regions is suggested to be attributed to the oxygen evolution during the peritectic melting of YBa2Cu3O7−y

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