Relationship between step velocity and etch-pit morphology of calcite in Asp solution

Abstract

We determined the step velocities of calcite in dissolution under Asp additive condition to elucidate the mechanism of morphological change of etch-pit caused by Asp. The step velocities were calculated from the data of in-situ AFM observation and ex-situ CLSM observation. The step velocities of obtuse steps were inhibited by Asp at more than 0.01 M. The effect of Asp to acute steps was also observed, but it was far less than to the obtuse steps. Moreover we observed the appearance of [010] step at 0.03 M and more than 0.03 M. These effects of Asp caused the drastic change of etch-pit shape.