Abstracts » Zoology and wildlife conservation

Molecular-scale mechanisms of crystal growth in barite

Article Abstract:

Models of crystal growth were defined by comparisons of macroscopic growth kinetics with theoretical predictions. The classic Burton-Cabrera-Frank (BCF) theory has often been observed, but such growth is sometimes inhibited, thought to be due to impurities. Tests on the growth of barite crystals were undertaken using in situ observations and computer simulations of growth units. Strongly anisotropic growth of two-dimensional nuclei was observed, and structure-induced self-inhibition of spiral growth was seen.

Observations, Barite

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Experimentally produced oscillatory zoning in the (Ba, Sr)SO4 solid solution

Article Abstract:

A porous silica-gel transport medium allows the growth and oscillatory zoning of the crystal (Ba,Sr)SO4 in solid solution through the counter-diffusion of Ba, Sr and SO4 ions. Moreover, threshold supersaturation for nucleation depends on the varying solubilities of the two pure crystalline phases. Coupling between the compositional gradients in the solid and liquid forms yields the oscillatory behavior.

Usage, Cover Story, Silica gel

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Prediction of crystal growth morphology based on structural analysis of the solid-fluid interface

Article Abstract:

A new method is developed to determine the relative growth rates of crystal faces. The method is based on the kinetic models and computer simulations of a solid-fluid interface. The new method reveals that the energy necessary to produce a change at the crystal surface controls the parameters which influence the growth.

Research, Epitaxy

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