Abstract
X-ray topography and laser Michelson interferometry combined with a two-thermostat interswitchable growth system were applied to study the (101) ADP face in undersaturated solutions. The movement of existing step patterns proved to be symmetrical with respect to growth and dissolution. The limiting undersaturation for the appearance of a dislocation etchpit (α∗=0.5%) allowed us to estimate the Burgers vector/effective free surface energy ratio for one of the dislocation sources: b/α=5.3x10 -8 J -1 m 3. Etching of micro-defects and of colloid size particles present in the crystal was observed. Dissolution and regeneration of the crystal edges show a strong step diffusion field overlap. The (100) ADP face surface layer dissolves in a slightly supersaturated solution, presumably due to excess stress. Etching of vicinal boundaries was observed and the existence of a limiting undersaturation for it helped us to propose a new model of sectorial boundaries.
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