INVESTIGADORES
VEGA Daniel Alberto
artículos
Título:
Amorphous precursors of crystallization during spinodal decomposition
Autor/es:
LR GOMES; DA VEGA
Revista:
PHYSICAL REVIEW E - STATISTICAL PHYSICS, PLASMAS, FLUIDS AND RELATED INTERDISCIPLINARY TOPICS
Editorial:
American Physical Society
Referencias:
Año: 2011 vol. 83 p. 215011 - 215015
ISSN:
1063-651X
Resumen:
A general Landau?s free energy functional is used to study the dynamics of crystallization during liquid-solid
spinodal decomposition (SD). The strong length scale selectivity imposed during the early stage of SD induces
the appearance of small precursors for crystallization with icosahedral order. These precursors grow in densely
packed clusters of tetrahedra through the addition of new particles. As the average size of the amorphous
nuclei becomes large enough to reduce geometric frustration, crystalline particles with a body-centered cubic
symmetry heterogeneously nucleate on the growing clusters. The volume fraction of the crystalline phase is
strongly dependent on the depth of quench. At deep quenches, the SD mechanism produces amorphous structures
arranged in dense polytetrahedral aggregates.