Mechanism for the Peritectic Reaction and Growth of Aligned Grains in YBa2Cu3O6+x |
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Authors: | Charles A. Bateman Lijie Zhang Helen M. Chan Martin P. Harmer |
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Affiliation: | Department of Materials Science and Engineering and Materials Research Center, Lehigh University, Bethlehem, Pennsylvania 18015 |
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Abstract: | It is experimentally observed that the peritectic reaction, 211 + liquid → 123, can be driven essentially to completion in 1 h at an undercooling of only ∽30°C. The kinetic data, together with the observed microstructures, are inconsistent with the normal mechanism of the peritectic reaction. It is proposed that the mechanism of the reaction involves dissolution of 211 particles into the liquid and precipitation of solid 123. The aligned grain structure is explained through sympathetic nucleation of new 123 grains on existing grains. |
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Keywords: | yttrium barium copper oxide (YBCO) peritectic reactions grain growth mechanism |
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