分形动力学在薄膜和块体材料微结构演变中的作用

IF 2.7 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research Pub Date : 2024-08-26 DOI:10.1557/s43578-024-01424-3
K. A. Padmanabhan, M. Ghanashyam Krishna
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引用次数: 0

摘要

在许多薄膜、块状试样和断裂样品中都能观察到分形(微)结构。在薄膜中形成这些结构的一种现象是扩散限制聚集。扩散受限聚集的假定是,此类结构的形成与源条件无关,仅依赖于薄膜与基底之间的相互作用,并且在两种情况下都要求单结晶度。在非晶或晶体基底上的非晶或晶体薄膜中出现分形结构的可能性受到的关注有限。然而,对溅射沉积过渡金属氮化物薄膜的研究结果表明,这些组合确实可以产生分形结构,如树枝状和雪花状。在这项工作中,我们推测这些微结构的形成可能与生长所提供的初始条件有关,而且对这些初始条件非常敏感,从而得出结论:可能是与混沌有关的动力学在起作用。我们认为需要一个新的理论框架来解释这些现象。我们试图利用我们的研究成果以及文献中的一些成果来确定这一领域的已知和未知因素。
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On the role of fractals dynamics in the evolution of microstructures in thin films and bulk materials

Fractal (micro)-structures are observed in many thin films, bulk specimens and fractured samples. A phenomenon that leads to the formation of these structures in thin films is diffusion-limited aggregation. The assumption in diffusion-limited aggregation is that formation of such structures is independent of the source conditions and relies only on film-substrate interactions with requirement of single crystallinity in both cases. The possibilities of fractal structures occurring in amorphous or crystalline film-on-amorphous or crystalline substrate have received limited attention. However, results on sputter deposited transition metal nitride thin films show that these combinations can indeed lead to fractal structures such as dendrites and snowflakes. In this work we postulate that the formation of these microstructures is perhaps related and sensitive to the initial conditions provided for growth, which leads to a conclusion that perhaps chaos-related dynamics is at work. We believe that a new theoretical framework is required to explain these phenomena. An attempt to identify the knowns and the unknowns in this area is made using our results as well as some available in the literature.

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来源期刊
Journal of Materials Research
Journal of Materials Research 工程技术-材料科学:综合
CiteScore
4.50
自引率
3.70%
发文量
362
审稿时长
2.8 months
期刊介绍: Journal of Materials Research (JMR) publishes the latest advances about the creation of new materials and materials with novel functionalities, fundamental understanding of processes that control the response of materials, and development of materials with significant performance improvements relative to state of the art materials. JMR welcomes papers that highlight novel processing techniques, the application and development of new analytical tools, and interpretation of fundamental materials science to achieve enhanced materials properties and uses. Materials research papers in the following topical areas are welcome. • Novel materials discovery • Electronic, photonic and magnetic materials • Energy Conversion and storage materials • New thermal and structural materials • Soft materials • Biomaterials and related topics • Nanoscale science and technology • Advances in materials characterization methods and techniques • Computational materials science, modeling and theory
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