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Mechanism for the Peritectic Reaction and Growth of Aligned Grains in YBa2Cu3O6+x

 

作者: Charles A. Bateman,   Lijie Zhang,   Helen M. Chan,   Martin P. Harmer,  

 

期刊: Journal of the American Ceramic Society  （WILEY Available online 1992）
卷期: Volume 75, issue 5  

页码: 1281-1283

 

ISSN:0002-7820

 

年代: 1992

 

DOI:10.1111/j.1151-2916.1992.tb05572.x

 

出版商: Blackwell Publishing Ltd

 

关键词: yttrium barium copper oxide (YBCO);peritectic;reactions;grain growth;mechanism

 

数据来源: WILEY

 

摘要:

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 gr

 

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