Mechanism for the Peritectic Reaction and Growth of Aligned Grains in YBa2Cu3O6+x
Mechanism for the Peritectic Reaction and Growth of Aligned Grains in YBa2Cu3O6+x
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DOI：
10.1111/j.1151-2916.1992.tb05572.x
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发表时间：
1992-05
影响因子：
3.9
通讯作者：
C. Bateman;Lijie Zhang;H. M. Chan;M. Harmer
中科院分区：
文献类型：
--
作者：
C. Bateman;Lijie Zhang;H. M. Chan;M. Harmer
实验观察到，在仅1.30 °C的过冷度下，211 +液体123的周向反应可以在1小时内基本上被驱动完成。的动力学数据，连同观察到的微观结构，是不符合正常的机制的周向反应。提出反应机理涉及211颗粒溶解到液体中和固体123沉淀。通过新的123晶粒在现有晶粒上的交感形核解释了对齐的晶粒结构。
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.