Analysis of
Growth Spirals on Vapor-Grown Metal-free beta-Phthalocyanine Crystals
Panina N, Meekes H , van Enckevort WJP , Deroover G, Vlieg E
CRYSTAL GROWTH & DESIGN Volume:
9 Issue: 5 Pages: 2409-2414
Abstract:
The extremely
elongated growth spirals observed using atomic force microscopy on the
largest {10 (1) over bar} faces of the needle crystals of vapor-grown
metal-free beta-phthalocyanine are analyzed. An analytical model for
the growth of anisotropic rectangular spirals is proposed to relate
step distances and the step energies to the driving force for
crystalization. The model is confronted with the experimental results,
with kinetic Monte Carlo simulations, and with a growth step analysis.
The model is well able to describe the observed and simulated spiral
shapes. In addition, the experimental driving force for crystallization
Could be estimated and turns Out to be reduced considerably as a result
Of diffusion limitation when compared to the value obtained for ideal
gas behavior.