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首页> 外文期刊>Advanced Functional Materials >Single-Phase Filamentary Cellular Breakdown Via Laser-Induced Solute Segregation
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Single-Phase Filamentary Cellular Breakdown Via Laser-Induced Solute Segregation

机译：通过激光诱导溶质分离的单相丝状细胞分裂。

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摘要

Nanosecond melting and quenching of materials offers a pathway to novel structures with unusual properties. Impurity-rich silicon processed using nanosecond-pulsed-laser-melting is known to produce nanoscale features in a process referred to as cellular breakdown due to destabilization of the planar liquid/solid interface. Here, atom probe tomography combined with electron microscopy is applied to show that the morphology of cellular breakdown in these materials is significantly more complex than previously documented. Breakdown into a complex, branching filamentary structure topped by a few nm of a cell-like layer is observed. Single-phase diamond cubic silicon highly supersaturated with at least 10% atomic Co and no detectable silicides is reported within these filaments. In addition, the unprecedented spatio-chemical accuracy of the atom probe allows to investigate nanosecond formation dynamics of this complex material. Previously reported properties of these materials can now be reconsidered in light of their true composition, and this class of inhomogeneous metastable alloys in silicon can be explored with confidence.
机译：纳秒级的材料熔化和淬火为具有异常特性的新型结构提供了一条途径。已知使用纳秒脉冲激光熔融法处理的富含杂质的硅会由于平面液/固界面的不稳定而在称为细胞破裂的过程中产生纳米级特征。在这里，应用原子探针层析成像与电子显微镜相结合来显示这些材料中细胞分解的形态比以前记录的要复杂得多。观察到分解成复杂的，分支的丝状结构，其顶部是几纳米的细胞样层。单相金刚石立方晶硅中至少含有10％的原子Co高度过饱和，并且在这些灯丝中未发现可检测的硅化物。此外，原子探针空前的时空化学准确性使我们能够研究这种复杂材料的纳秒级动力学。现在，可以根据它们的真实组成重新考虑这些材料的特性，并且可以放心地探索这类硅中的非均质亚稳态合金。

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