Step dynamics and spiral growth on calcite

Details Step dynamics and spiral growth on calcite Step dynamics and spiral growth on calcite

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57..491g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 57, Issue 2, pp.491-495

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24

Scientific paper

We present novel in situ observations of the dynamics of monomolecular growth steps on calcite. Steps do not interact at separations of ~ 10 nm and above, indicating that surface diffusion does not control calcite growth. Instead, steps advance by material addition from solution onto step sites or a narrow adjacent zone. Step nucleation is primarily at growth spirals, and no spontaneous surface nucleation is observed; growth rate is controlled by spiral rotation rate. Thus, classical growth models based on rapid surface diffusion are inapplicable to calcite and possibly to many other minerals.

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