Lattice expansion and phase stability in nanocrystalline titanium thin films

Chakraborty, J (2021) Lattice expansion and phase stability in nanocrystalline titanium thin films. Philosophical Magazine Letters, Online . pp. 1-12.

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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.

Item Type:Article
Official URL/DOI:https://www.tandfonline.com/doi/abs/10.1080/095008...
Uncontrolled Keywords:Lattice expansion; phase transformation; titanium; crystallites; hcp; fcc; X-ray diffraction
Divisions:Material Science and Technology
ID Code:8253
Deposited By:Sahu A K
Deposited On:25 Jan 2021 15:03
Last Modified:29 Jun 2021 18:00
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