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首页> 外文期刊>Crystal growth & design >The Effect of Growth Kinetics on the Formation of Peritectic Microstructures in a Sr(NO3)(2)-H2O System
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The Effect of Growth Kinetics on the Formation of Peritectic Microstructures in a Sr(NO3)(2)-H2O System

机译：生长动力学对Sr（NO3）（2）-H2O体系中包晶微结构形成的影响

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摘要

We evaluated the growth and dissolution behavior of the primary a phase, Sr(NO3)(2), and peritectic beta phase, Sr(NO3)(2)center dot 4H(2)O, coexisting in aqueous solutions above or below the peritectic temperature (T-p) in situ. Above T-p, when the two phases simultaneously grew in close proximity, the metastable beta phase began to partially dissolve where it approached the alpha phase, although the remaining portion of the beta phase was still growing. Overall, the growing alpha phase could not approach the dissolving face of the beta phase; thus, a peritectic microstructure with the alpha phase enclosing the beta phase was not formed. Conversely, below T-p, regardless of whether the metastable alpha phase was growing or dissolving, the stable beta phase engulfed the alpha phase, resulting in a peritectic microstructure with the beta phase enveloping the alpha phase. This demonstrated that it is necessary for the stable phase to dominate the metastable phase in growth kinetics for bringing about a peritectic microstructure consisting of the metastable phase in the core and the stable phase in the periphery.
机译：我们评估了主要a相Sr（NO3）（2）和包晶β相Sr（NO3）（2）中心点4H（2）O的生长和溶解行为原位温度（Tp）。在T-p之上，当两个相同时紧密靠近生长时，亚稳的β相开始在接近α相的位置部分溶解，尽管β相的其余部分仍在增长。总体而言，不断增长的alpha阶段无法接近beta阶段的溶解面。因此，没有形成具有包围着β相的α相的包晶组织。相反地​​，在T-p以下，无论亚稳态α相是在生长还是溶解，稳定的β相都会吞噬α相，从而形成包晶的微观结构，其中β相包围α相。这证明了稳定相必须在生长动力学中支配亚稳相，以产生由核心中的亚稳相和周围的稳定相组成的包晶组织。

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