Mass Transport and Chemical Demixing of Y-Ba-Cu-O Compounds During Sintering in Temperature Gradients |
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| Authors: | Mohamed N.,Rahaman Lutgard C.,De Jonghe &# May-Ying, Chu &# |
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| Affiliation: | Ceramic Engineering Department, University of Missouri, Rolla, Missouri 65401;Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory, and University of California, Berkeley, California 94720 |
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| Abstract: | A thin cylindrical powder compact (3-mm diameter by 20-mm) with a nominal composition of YBa2Cu3Ox was sintered in a static temperature gradient of 25°C/mm in air for 12 h. The temperature at the hot end of the sample was maintained at 940°±5°C. Considerable mass transport and chemical demixing occurred along the length of the sample. The results are consistent with the formation of a liquid phase at the hot end of the sample, transport of the liquid down the temperature gradient, and the formation of different eutectic compositions along the length of the sample. The implications for processing high-Tc superconductors in the system Y-Ba-Cu-O are discussed. |
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