纳米晶钛薄膜的晶格膨胀和相稳定性

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters Pub Date : 2021-06-22 DOI:10.1080/09500839.2021.1937367

J. Chakraborty

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引用次数: 0

摘要

摘要用X射线衍射方法观察了多晶Ti薄膜中hcp-Ti相的晶粒尺寸相关晶格膨胀。X射线线轮廓分析（XLPA）显示，随着膜厚度的减小，hcp-Ti相中的晶粒尺寸有系统地减小。hcp-Ti相的比体积（即体积/原子）随着晶粒尺寸的减小而增加，证实了这种晶格膨胀。在适当地结合晶粒尺寸相关的晶界宽度之后，已经使用现有的理论模型模拟了观察到的晶格膨胀。进一步揭示了晶粒尺寸的减小和伴随的晶格膨胀导致hcp-Ti相的晶格不稳定性，并最终导致元素Ti在这些薄膜中的hcp-fcc相变，正如作者早些时候报道的那样。

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Lattice expansion and phase stability in nanocrystalline titanium thin films

ABSTRACT Crystallite-size-dependent lattice expansion of the hcp Ti phase has been observed by X-ray diffraction of polycrystalline Ti thin films. X-ray line profile analysis (XLPA) revealed a systematic reduction of crystallite size in the hcp Ti phase with decreasing film thickness. Increase of specific volume (i.e. volume/atom) of the hcp Ti phase with decreasing crystallite size has confirmed such lattice expansion. The observed lattice expansion has been simulated using an existing theoretical model after appropriately incorporating a crystallite-size-dependent width of the grain boundaries. It is further revealed that decreasing crystallite size and accompanying lattice expansion leads to lattice instability of the hcp Ti phase and eventually to a hcp-fcc phase transformation of elemental Ti in these thin films as reported earlier by the author.

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来源期刊

Philosophical Magazine Letters 物理-物理：凝聚态物理

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

2.7 months

期刊介绍： Philosophical Magazine Letters is the rapid communications part of the highly respected Philosophical Magazine, which was first published in 1798. Its Editors consider for publication short and timely contributions in the field of condensed matter describing original results, theories and concepts relating to the structure and properties of crystalline materials, ceramics, polymers, glasses, amorphous films, composites and soft matter. Articles emphasizing experimental, theoretical and modelling studies on solids, especially those that interpret behaviour on a microscopic, atomic or electronic scale, are particularly appropriate. Manuscripts are considered on the strict condition that they have been submitted only to Philosophical Magazine Letters , that they have not been published already, and that they are not under consideration for publication elsewhere.