Prismatic morphology of an ADP crystal grown in a defined crystallographic direction

Abstract

Herein, ammonium dihydrogen phosphate (NH 4 H 2 PO 4 , ADP) crystals were grown in a defined crystallographic direction (q ¼ 90 , F ¼ 45 ) in an aqueous solution using the point seed rapid growth method. Ex situ atomic microscopy (AFM) measurements were implemented to observe the prismatic growth micro-morphology of ADP and Cr 3+-doped ADP in the defined crystallographic direction. It was found that with the increasing supersaturation, the growth morphology changed in turn to elementary steps, macro steps, and 2D nuclei. Moreover, the differences between ADP and Cr 3+-doped ADP grown in the defined crystallographic direction have been discussed. The influence of Cr 3+ on the growth of ADP crystals has been explored.