Incubation time of etch pits at dislocation outcrops

Details Incubation time of etch pits at dislocation outcrops Incubation time of etch pits at dislocation outcrops

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.2955l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 14, pp.2955-2963

Physics

Scientific paper

The incubation time for etch pit formation on single crystals of willemite was estimated for the first time by making successive optical measurements of the etch pit growth rate and then calculating incubation times by extrapolating the length vs. time curve for the etch pits back to zero width. Incubation times were estimated for the (0001) faces of willemite (containing minor impurities of Fe 2+ , Mg 2+ , and Al 3+ ) after dissolution in acidic solutions (pH = 0-5) at 30°C. Shorter incubation times at lower pH were attributed to the pH dependence of leaching rates of the inhibitors (e.g., Fe 2+ ), which in acidic solutions should accumulate rapidly at dislocation outcrops and maintain the near surface undersaturation of willemite, thus allowing etch pits to develop at these high energy sites. Dissolution (pH = 2) experiments with various cations (Mn 2+ , Fe 2+ , Co 2+ , Ni 2+ , Cu 2+ , Mg 2+ , Al 3+ , Fe 3+ ) already present in the etchant indicated that incubation times were indeed related to the dissolution-inhibiting cations. Spiking of etchant (pH = 2) beyond a critical concentration of Fe 2+ (0.01 M) significantly lowered the dissolution rates (especially along the < 2 0> and the < 10 O>, i.e., normal to the sides of pit opening) and shortened the incubation time as measured by static immersion experiments.

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