To unravel the effects of phonon confinement, the influence of size and morphology on the atomic vibrations is investigated in Sn nanoislands and cluster-assembled films. Nuclear resonant inelastic x-ray scattering is used to probe the phonon densities of states of the Sn nanostructures which show significant broadening of the features compared to bulk phonon behavior. Supported by ab initio calculations, the broadening is attributed to phonon scattering and can be described within the damped harmonic oscillator model. Contrary to the expectations based on previous research, the appearance of high-energy modes above the cutoff energy is not observed. From the thermodynamic properties extracted from the phonon densities of states, it was found that grain boundary Sn atoms are bound by weaker forces than bulk Sn atoms.
Houben, Kelly, Couet, Sebastien, Trekels, Maarten, Menéndez, Enric, Peissker, Tobias, Seo, Jin Won, Hu, Michael Y., Zhao, Jiyong Y., Alp, Esen E., Roelants, Sam, Partoens, Bart, Milošević, Milorad V., Peeters, François M., Bessas, Dimitrios, Brown, Simon A., Vantomme, André, Temst, Kristiaan, & Van Bael, Margriet J. (2017). Lattice dynamics in Sn nanoislands and cluster-assembled films. Physical Review B, 95(15). https://doi.org/10.1103/PhysRevB.95.155413
Houben, Kelly, Couet, Sebastien, Trekels, Maarten, et al., "Lattice dynamics in Sn nanoislands and cluster-assembled films," Physical Review B 95, no. 15 (2017), https://doi.org/10.1103/PhysRevB.95.155413
@article{osti_1377394,
author = {Houben, Kelly and Couet, Sebastien and Trekels, Maarten and Menéndez, Enric and Peissker, Tobias and Seo, Jin Won and Hu, Michael Y. and Zhao, Jiyong Y. and Alp, Esen E. and Roelants, Sam and others},
title = {Lattice dynamics in Sn nanoislands and cluster-assembled films},
annote = {To unravel the effects of phonon confinement, the influence of size and morphology on the atomic vibrations is investigated in Sn nanoislands and cluster-assembled films. Nuclear resonant inelastic x-ray scattering is used to probe the phonon densities of states of the Sn nanostructures which show significant broadening of the features compared to bulk phonon behavior. Supported by ab initio calculations, the broadening is attributed to phonon scattering and can be described within the damped harmonic oscillator model. Contrary to the expectations based on previous research, the appearance of high-energy modes above the cutoff energy is not observed. From the thermodynamic properties extracted from the phonon densities of states, it was found that grain boundary Sn atoms are bound by weaker forces than bulk Sn atoms.},
doi = {10.1103/PhysRevB.95.155413},
url = {https://www.osti.gov/biblio/1377394},
journal = {Physical Review B},
issn = {ISSN 2469-9950},
number = {15},
volume = {95},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2017},
month = {04}}
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 557, Issue 2https://doi.org/10.1016/j.nima.2005.11.114