PERIODIC ROUGHENING AND FACETING GROWTH IN TWO-DIMENSIONS. Xiao-Yong Liu, Mu Wang, and Nai-Ben Ming, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 & Center for Advanced Studies of Science and Technology of Microstructures, Nanjing 210093, China

In two-dimensional solution growth system we discovered a novel growth behavior of crystals that roughening and faceting appeared periodically on a crystal branch. The microscopic morphology of the crystal surface in these two regions were examined respectively by AFM and differential interference contrast microscopy. The spatial distance of the neighboring faceting regions was measured as a function of the concentration of impurity in solution. The concentration of impurities trapped in roughened region and faceted region was detected by absorption infrared spectra. We found that the amount of impurity in the roughened region was much higher than that in the faceted region. An interpretation is given to this phenomenon based on our experimental observations.