Evolution of thermodynamic potentials in closed and open nanocrystalline systems: Ge-Si:Si(001) islands.

Content Provider	Semantic Scholar
Author	Leite, Marina S. Malachias, A. Kycia, Stefan W. Kamins, T. I. Williams, R. Stanley Medeiros-Ribeiro, Gilberto
Copyright Year	2008
Abstract	An open (closed) system, in which matter is (not) exchanged through surface diffusion, was realized via growth kinetics. Epitaxially grown Si-Ge:Si (001) islands were annealed in different environments affecting the diffusivity of Si adatoms selectively. The evolution of the driving forces for intermixing while approaching the equilibrium was inferred from Synchrotron x-ray measurements of composition and strain. For the open system, intermixing due to the Si inflow from the wetting layer (reservoir) caused a decrease in the Ge content, leading to a lowering of the elastic energy and an increase in the mixing entropy. In contrast, for the closed system, while keeping the average Ge composition constant, atom rearrangement within the islands led to an increase in both elastic and entropic contributions. The Gibbs free energy decreased in both cases, despite the different evolution paths for the composition profiles.
Starting Page	226101
Ending Page	226101
Page Count	1
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://leitelab.umd.edu/wp-content/uploads/2014/01/2008-Leite_PRL.pdf
PubMed reference number	18643432v1
Volume Number	100
Issue Number	22
Journal	Physical review letters
Language	English
Access Restriction	Open
Subject Keyword	Biological Evolution DNA Sequence Rearrangement Equilibrium Greater Than or Equal To Inference International System of Units Reservoir Device Component Roentgen Rays Synchrotrons Thermodynamics free energy
Content Type	Text
Resource Type	Article