Friedel oscillations and helium bubble ordering in molybdenum
Materials Science
2021-01-01 v1
Abstract
Helium ions implanted into metals can evolve into ordered bubbles isomorphic to the host lattice. Long-range elastic interaction is generally believed to drive the formation of bubble superlattice, but little is known about the thermodynamics at the very initial stage. Our first-principles calculations demonstrate that in molybdenum, Friedel oscillations induced by individual helium generate both potential barriers and wells for helium clustering at short He-He distances. Such repulsion and attraction at high concentration provide a thermodynamic diving force to assist lining up randomly distributed He atoms into ordered bubbles. Friedel oscillations might have general impact on solute-solute interactions in alloys.
Cite
@article{arxiv.2012.15402,
title = {Friedel oscillations and helium bubble ordering in molybdenum},
author = {W. T. Geng and Q. Zhan},
journal= {arXiv preprint arXiv:2012.15402},
year = {2021}
}
Comments
11 pages, 4 figures