Growth of the {100} faces of ammonium dihydrogen phosphate crystals in the presence of ionic species

The kinetics of movement of elliptical growth layers on the {100} faces of ammonium dihydrogen phosphate crystals are reported for growth from aqueous solution at 19.36, 23.96 and 28.54°C in the supersaturation range 0.025<σ<0.08. The layers are shown to be step bunches and surface diffusion is considered to play the rate determining role in the growth process. The effects of trace amounts (up to 100 ppm) of CrCl3ṡ6H2O FeCl3 and AlCl3 on the...