Formation of pores and Y{sub 2}BaCuO{sub 5}-free regions during melt processing of Y{sub 1.6}Ba{sub 2.3}Cu{sub .3}O{sub x}
- Sunmoon Univ., Chungnam (Korea, Republic of). Dept. of Materials Science and Engineering
- Korea Atomic Energy Research Inst., Taejon (Korea, Republic of). Superconductivity Research Lab.
The formation of spherical pores and regions free of Y{sub 2}BaCuO{sub 5} (2-1-1) has been studied by melt processing Y{sub 1.6}Ba{sub 2.3}Cu{sub 3.3}O{sub x} in two different atmospheres (air and oxygen). When the sintered Y{sub 1.6}Ba{sub 2.3}Cu{sub 3.3}O{sub x} specimens are melted at 1,050 C, many spherical pores form in the melted specimens. During the subsequent cooling, the pores are filled by liquid flow and finally solidified to Y{sub 2}BaCuO{approximately}5-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 YBa{sub 2}Cu{sub 3}O{sub 7{minus}y} in an oxygen atmosphere produces more oxygen gas than that in air, the formation of the pores and Y{sub 2}BaCuO{sub 5}-free regions is suggested to be attributed to the oxygen evolution during the peritectic melting of YBa{sub 2}Cu{sub 3}O{sub 7{minus}y}.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 417776
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 11 Vol. 79; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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