Activation volumes for solid-solid transformations in nanocrystals
Activation volumes for solid-solid transformations in nanocrystals
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DOI：
10.1126/science.1063581
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发表时间：
2001-09-07
期刊：
影响因子：
56.9
通讯作者：
Alivisatos, AP
中科院分区：
文献类型：
--
作者：
Jacobs, K;Zaziski, D;Alivisatos, AP
四，六配位结构之间的过渡在CdSe纳米晶体显示简单的过渡动力学相比，扩展的固体，我们确定的激活体积的弛豫时间的压力依赖性。我们的测量结果表明，转变发生的成核机制，并放置强有力的约束类型的微观运动，导致转变。这里提出的分析类型是困难的扩展固体，它通过复杂的动力学转换，并涉及不明确的域体积。在纳米尺度上形成图案的固体可能被证明是小系统结构转变的一般研究的强大模型，以及在扩展固体中。
The transition between four- and six-coordinate structures in CdSe nanocrystals displays simple transition kinetics as compared with the extended solid, and we determined activation volumes from the pressure dependence of the relaxation times. Our measurements indicate that the transformation takes place by a nucleation mechanism and place strong constraints on the type of microscopic motions that lead to the transformation. The type of analysis presented here is difficult for extended solids, which transform by complicated kinetics and involve ill-defined domain volumes. Solids patterned on the nanoscale may prove to be powerful models for the general study of structural transitions in small systems, as welt as in extended solids.