Chakraborty, J (2021) Lattice expansion and phase stability in nanocrystalline titanium thin films. Philosophical Magazine Letters, Online . pp. 1-12.
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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.
|Uncontrolled Keywords:||Lattice expansion; phase transformation; titanium; crystallites; hcp; fcc; X-ray diffraction|
|Divisions:||Material Science and Technology|
|Deposited By:||Sahu A K|
|Deposited On:||25 Jan 2021 15:03|
|Last Modified:||29 Jun 2021 18:00|
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