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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Nanodomain Fragmentation And Local Rearrangements In Cdse Under Pressure
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Nanodomain Fragmentation And Local Rearrangements In Cdse Under Pressure

机译:Cdse在压力下的纳米域碎片化和局部重排

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摘要

Structural transformations in extended solids result from local atomic rearrangements and phase growth mechanisms. A broad class of technologically relevant properties critically depends on local structural issues connected with domain sizes, domain boundary geometries, and defects. However, a precise understanding of structural transformation mechanisms and domain formation is still an open question. Here, we demonstrate the feasibility of very detailed mechanistic investigations in real materials as a prerequisite for intelligent property control. We address the problem of domain fragmentation in bulk CdSe under pressure, jointly by molecular dynamics simulations, high-pressure experiments, and HR-TEM imaging. We show that domain fragmentation is taking place in the high-pressure regime, where nucleation events generate both zinc blende (B3) and wurtzite (B4) structural motifs and, in turn, cause the final lamellar appearance observable by high-resolution TEM. A changed nucleation pattern and a modified B3/B4 ratio represents the system's response to modified external stress conditions.
机译:扩展固体中的结构转变是由局部原子重排和相生长机制引起的。一类广泛的与技术相关的特性严重取决于与域大小,域边界几何形状和缺陷有关的局部结构问题。但是,对结构转化机制和结构域形成的精确理解仍然是一个悬而未决的问题。在这里,我们演示了在实际材料中进行非常详细的机械研究的可行性,将其作为智能属性控制的先决条件。我们通过分子动力学模拟,高压实验和HR-TEM成像共同解决了在压力下大体积CdSe中的畴碎裂问题。我们显示域碎裂发生在高压状态下,其中成核事件同时生成锌共混物(B3)和纤锌矿(B4)的结构图案,进而导致通过高分辨率TEM观察到的最终层状外观。改变的形核模式和改进的B3 / B4比表示系统对改进的外部应力条件的响应。

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