Habit changes of NaBrO_3 crystals grown from aqueous solution doped with sodium acetate

摘要

The effects of doping of sodium acetate upon the habit changes of NaBrO_3 crystals have been investigated. The crystals were grown from aqueous solution under the following conditions: (i) supersaturations, ln (C/C_e)=0-0.4, (C_e: equilibrium mol fraction); (ii) growth temperatures, 15-43 deg C. The gross morphologies of crystals have taken on three distinct forms: tetrahedral {1 1 1} habit, cubic {1 0 0} and intermediate ({1 1 1}+{1 0 0}) habits. The result of habit changes was shown in a plot of growth temperature against supersaturation as compared to the results from non- doping and doping of 1.15 mol/100 acetic acid (J. Crystal Growth 158 (1996) 336; J. Crystal Growth 212 (2000) 507). The dependency of the growth rates upon the growth temperatures was investigated under the conditions where the supersaturation was kept constant.