Crystal Research and Technology
Cryst. Res. Technol. 35 (2000) 291 - Abstract -

K. Srinivasan, K. Meera*, P. Ramasamy*

Crystal Research Centre, Alagappa University, Tamil Nadu, India
*Crystal Growth Centre, Anna University, Tamil Nadu, India

A Novel Method to Enhance Metastable Zone Width for Crystal Growth from Solution

A novel method has been found to enhance the metastable zone width of solutions in their supersaturated region in order to grow large size crystals. In which, the incorporation of a small quantity of Ethylenediamine tetra acetic acid (EDTA), a well-known chelating agent, enhances the zone width significantly due to its chelating action. Also this incorporation reduces the nucleation rate and enhances the growth rate of the crystal. X-ray rocking curve experiment for the grown crystals reveals that EDTA addition does not affect the crystalline quality. This concept was first realized with Potassium acid phthalate (KAP) solutions and then confirmed with Potassium dihydrogen phosphate (KDP) and Triglycine Sulphate (TGS).

Keywords: metastable zone width, EDTA, chelation, KAP, KDP, TGS, growth rate


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